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Space?Forced?Analysis?on?Large-Span?Continuous?Rigid?Frame??Bridge?with?Wide?Box?Girder HE Chang, LIANG Li-hui 2009, 28(5): 813-817.  DOI: 10.3969/j.issn.1674-0696.2009.05.01 Abstract ( )   PDF (714KB) ( )   Because?of?the?mechanic?feature?of?large?span?continuous?rigid?frame?bridge?with?wide?box?girder?itself,the?phenomena?of?cracks?of?the?box?girder?and?excessive?deflection?in?the?middle?of?the?span?widely?exist.?Taking?Nanhedi?Bridge?as?an?example,?both?global?and?partial?analysis?on?this?bridge?is?carried?out,?using?3?D?finite?element?method.?The?problem?how?to?avoid?the?cracks?in?the?box?girder?and?excessive?deflection?in?the?middle?of?the?span?is?resolved?through?the?analysis?and?comparison?which?is?worthy?to?apply?into?the?engineering?practice. References | Related Articles | Metrics

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Wheel?Load?of?Bridge?Deck?of?Large-Span?Continuous?Composite?Box?Girder WU Wan-zhong, ZHOU Yun-gang, ZHANG Yang-yong 2009, 28(5): 818-821.  DOI: 10.3969/j.issn.1674-0696.2009.05.02 Abstract ( )   PDF (703KB) ( )   Combining?with?the?engineering?case?study,?a?spatial?simulation?method?based?on?FEM?is?introduced?to?analyze?the?wheel?load?of?bridge?deck?in?the?large-span?continuous?bridge?with?composite?boxgirder.?The?results?of?the?analysis?are?compared?with?those?got?by?the?simplified?methods?in?relative?literature?review.?The?comparison?shows?that?the?results?got?by?simplified?methods?are?higher?than?those?got?by?FEM?in?general.?For?the?moments?in?the?middle?span?of?bridge?deck,?the?result?of?simply-supported?plate?model?got?by?simplified?method?is?over?29%?higher?than?that?got?by?FEM?;the?result?of?continuous?plate?model?got?by?simplified?method?is?over?15%?higher?than?that?got?by?FEM.?For?the?moments?at?the?supporting?point?of?the?plate,?the?result?is?over?51%?higher?than?the?result?got?by?FEM,?for?the?simplified?method?takes?no?consideration?of?the?re-distribution?of?internal?forces.?The?continuous?plate?model?is?recommended?to?estimate?the?moments?in?the?middle?span?of?bridge?deck?ureter?the?wheel?load?at?the?first?stage?of?design. References | Related Articles | Metrics

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Loading?Capacity?of?Composite?Box?Girder?Intersection?with?Special-Shaped?Steel?and??Concrete?in?Negative?Bending?Region WANG Bao-qiang, LIYun-sheng, WANG Yuan-qing 2009, 28(5): 822-825.  DOI: 10.3969/j.issn.1674-0696.2009.05.03 Abstract ( )   PDF (741KB) ( )   The?curved?beam?and?the?special-shaped?girder?have?been?widely?used?in?the?urban?and?highway?intersection?recently,?and?are?also?inclined?to?the?continuous?special-shaped?structure.?The?continuous?special-shaped?structure?is?complex,?and?the?studies?on?its?loading?and?deformation?characteristics?under?different?loads?are?of?great?significance?for?the?engineering?construction.?One?segment?of?composite?box?beam＇s?special-shaped?intersection?of?Beijing?South?Station?Viaduct?in?negative?bending?region?is?analyzed?by?FEM?software?ANSYS.?The?behavior?of?the?steel?box-concrete?composite?girder?at?intersection?is?mainly?analyzed,?such?as?the?stress?and?deformation?behavior?of?the?composite?girder?under?different?loads.?And?the?measures?to?reduce?the?stress?concentration?are?given,?which?offers?references?to?the?design?of?similar?structures References | Related Articles | Metrics

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Discussion?on?Non-uniformity?of?U-Looped?Prestressing?Tendons?Elongation?at??Tower?Anchorage?Zone CHANG Guo-qiang, WU Bo, LiU Kang, ZHANG Feng 2009, 28(5): 826-829.  DOI: 10.3969/j.issn.1674-0696.2009.05.04 Abstract ( )   PDF (412KB) ( )   Large-tonnage-and-small-radius?U-looped?prestressing?tendons（?UPTs?for?short）have?been?widely?used?in?the?anchorage?zone?of?cable-stayed?bridge?tower.?However,?only?the?research?that?the?elongation?of?steel?hinge?line?and?tensile?stress?has?non-uniformity?is?carried?out?in?current?study?and?the?level?of?elongation?and?tensile?stress?non-uniformity?has?not?been?cleared.?A?novel?method?to?test?the?non-uniformity?is?proposed,?which?is?by?virtue?of?the?statistical?method.?The?non-uniformity?of?small-radius?UPTs?elongation?and?tensile?stress?is?studied?by?the?full-scale?model?test?of?the?tower?anchorage?zone?at?one?cable-stayed?bridge.?The?research?draws?the?conclusion?that?the?non-uniformity?of?small-radius?UPTs?elongation?and?tensile?stress?is?certain?to?exist,?and?the?non-uniformity?level?increases?with?the?number?of?steel?hinge?lines.?When?UPTs?prestressing?system?is?used,?the?tension?stress?limit?should?not?be?controlled?by?the?current?bridge?design?specification,?and?the?value?of?that?should?be?reduced?appropriately. References | Related Articles | Metrics

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Calculation?of?Cable?Forces?of?CFST?Arch?Bridge?during?Core?Concrete?Casting GONG Cheng-li, LIU Jing 2009, 28(5): 830-832.  DOI: 10.3969/j.issn.1674-0696.2009.05.05 Abstract ( )   PDF (535KB) ( )   During?the?concrete?casting?process?of?concrete?filled?steel?tubular?（CFST）?arch?bridge,?the?phenomenon?that?the?process?tension?stress?could?exceed?allowable?stress?will?occur?at?some?stages,?and?the?process?tension?stress?must?be?adjusted?by?cable?forces.?To?find?the?best?cable?position,?a?method?making?use?of?the?sectional?stress?influence?line?of?core?concrete?at?arch?footing?is?put?forward.?The?stresses?of?control?section?about?core?concrete?casting?and?unit?cable?force?are?calculated?respectively.?According?to?allowable?stress?value?of?concrete?at?casting?stage,?the?value?of?cable?forces?during?the?core?concrete?casting?is?figured?out.?A?case?study?is?carried?out?at?Xiaohe?CFST?arch?bridge?under?construction?in?Hubei?Enshi,?and?the?calculation?method?is?introduced?in?detail. References | Related Articles | Metrics

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Investigation?on?Calculation?Pattern?for?4-Limb?Latticed?CFST?Section ZHOU Shui-xing, GONG Cheng-li, ZHANGMin 2009, 28(5): 833-836.  DOI: 10.3969/j.issn.1674-0696.2009.05.06 Abstract ( )   PDF (315KB) ( )   4-limb?latticed?section?is?a?common?section?type?of?large-span?concrete?filled?steel?tubular?arch?bridges.?There?are?two?types?in?terms?of?the?specific?structure,?including?the?battened?plate?structure?and?laced-bar?structure.?The?calculation?pattern?of?battened?plate?section?is?focused.?The?plate?element?and?spatial?beam?element?are?put?forward,?and?the?formula?of?equivalent?thickness?for?plate?element?is?deduced.?Key?points?of?modeling?with?spatial?beam?element?are?also?introduced.?A?case?study?is?carried?out?to?verify?that?both?calculation?patterns?can?satisfy?the?requirements?of?engineering?precision,?and?the?plate?element?method?is?more?convenient?in?practice. References | Related Articles | Metrics

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Design?of?Load-Bearing?Cable?of?Cable?Crane?Used?in?Large-Span?Bridge?Construction XU Hong-sheng, YAN Dong-huang, RAN Mao-xue 2009, 28(5): 837-839.  DOI: 10.3969/j.issn.1674-0696.2009.05.07 Abstract ( )   PDF (189KB) ( )   The?calculation?of?the?load-bearing?cable?should?be?more?accurate,?because?the?span?of?cable?crane?used?in?bridges?construction?becomes?larger?and?larger.?For?the?most?frequently?used?setting?up?scheme?of?cable?cranes?used?in?the?largerspan?bridge?construction,?the?tension?force?formulation?of?load-bearing?cable?is?deduced?with?the?eonsideration?of?all?loadbearing?cables?as?a?whole,?and?the?way?to?calculate?the?main?design?parameters?of?load-bearing?cable?is?put?forward.?A?case?study?of?cable?crane?with?tower?is?carried?out?on?Beipanjiang?Bridge?of?highway?from?Shanghai?to?Ruili?in?Yunan.?Through?the?comparison?of?the?results?got?from?the?practice?engineering,?the?accuracy?of?the?formulation?is?verified,?which?offers?significant?reference?to?the?design?and?the?application?of?cable?cranes?in?the?large-span?bridge?construction. References | Related Articles | Metrics

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One-Time?Tensioning?Formation?Technology?of?Single?Steel?Strand?Wire?of??Anchor?Cable?of?Steel?Cantilever?Installed?Truss?Arch?Bridge WANG Cun-shu, SUN Yu-xiang 2009, 28(5): 840-843.  DOI: 10.3969/j.issn.1674-0696.2009.05.08 Abstract ( )   PDF (567KB) ( )   Chongqing?Chaotianmen?Yangtze?River?Bridge?is?the?largest-span?steel?truss?arch?bridge?in?the?world?currently.?During?the?period?of?cantilever?installation,?two?pairs?steel?strand?cables,?together?with?the?main?arch?forming?a?self-anchor?common?balance?working?system,?are?set?up?to?control?the?inner?force?and?deformation?of?the?structure?of?main?arch.?Each?cable?group?contains148?stocks?of?steel?hinge?lines?and?the?biggest?rally?is?up?to?16661kN.?One-time?tensioning?formation?technology?of?single?steel?strand?wire?is?adopted?in?the?construction.?The?principle?of?the?technology?is?simple,?and?it?is?convenient?for?construction,?which?may?offer?references?to?similar?projects. References | Related Articles | Metrics

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Application?of?Monte-Carlo?Method?to?Bridge?Damage?Identification SHAN De-shan, LIQiao, ZHANG Ji-gang 2009, 28(5): 844-847.  DOI: 10.3969/j.issn.1674-0696.2009.05.09 Abstract ( )   PDF (332KB) ( )   The?damage?identification?of?bridge?structure?is?taken?as?the?research?object;modal?strain?energy?method?and?Monte-Carlo?method?are?adopted?to?discuss?the?influence?of?the?inevitable?testing?noise?on?the?damage?location?of?bridge?structure.?The?influences?of?modal?orders,?single?damage,?multiple?damage?and?damage?locations?are?taken?into?consideration?during?the?analysis,and?the?structural?damages?are?located?according?to?the?change?ratio?of?modal?strain?energy＇with?noise.?Then,?a?case?study?of?one?continuous?bridge?is?presented?to?verify?the?effectiveness?of?the?proposed?method.?The?change?law?of?damage?identification?ratio?along?with?the?testing?noise?level?at?different?damage?degrees?and?damage?locations?is?obtained?after?10000?times?calculation?by?Monte-Carlo?method.?The?result?shows?that?the?damage?identification?ratio?is?a?more?suitable?token?of?the?damage?detection?method?and?it?is?suitable?for?the?actual?engineering?requirements. References | Related Articles | Metrics

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Bridge?Crack?Monitoring?and?Engineering?Application YAN Guo, ZHANG Kai-hong 2009, 28(5): 848-851.  DOI: 10.3969/j.issn.1674-0696.2009.05.10 Abstract ( )   PDF (675KB) ( )   Aiming?at?the?problems?that?exist?in?the?current?crack?monitoring?method?of?concrete?bridges,?the?basic?principle?of?incisive?network?of?crack?monitoring?is?studied.?And?the?real?time?crack?monitoring?system?of?concrete?bridge?structure?is?designed?on?the?basis?of?incisive?network,?and?the?corresponding?experiments?and?engineering?application?are?also?carried?out.?This?crack?monitoring?system?is?of?high?sensitivity?and?well?reliability,?which?can?carry?out?the?real-time?monitoring?of?actual?damage?conditions?of?concrete?structure?and?can?be?widely?applied?to?the?damage?monitoring?of?bridge,?dam?and?other?large?concrete?structures. References | Related Articles | Metrics

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Numerical?Study?on?Configuration?Optimization?of?High?Head??Large?Flood?Discharge?Tunnel YANG Zhong-chao, DiAOMing-jun, DENG Jun 2009, 28(5): 855-860.  DOI: 10.3969/j.issn.1674-0696.2009.05.12 Abstract ( )   PDF (1110KB) ( )   The?flood?discharge?process?of?3#?flood?discharge?tunnel?at?Xiluodu?Power?Station?in?Jinsha?River?has?been?simulated?successfully?by?means?of?k-8?turbulence?model?and?VOF（?Volume?of?Fluid）methods.?Aiming?at?the?problems?that?the?length?and?the?height?of?the?second?and?third?aeration?cavity?is?too?small,?and?the?local?cavitation?number?is?too?low,?the?flood?discharge?configuration?is?optimized?and?aeration?banks?are?adjusted,?so?that?the?pressure?of?the?flood?discharge?tunnel?inclines?to?distribute?more?homogenous?and?the?distribution?of?cavitation?number?inclines?to?stable,?which?promotes?the?character?of?flow?cavitation?erosion.?In?addition,?the?aeration?space?is?enlarged?so?as?to?extend?the?protecting?length?of?cavitation?erosion?of?flood?discharge?tunnel. References | Related Articles | Metrics

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Numerical?Simulation?of?Ground?Disturbance?of?Extra-Shallow-Underground-Pipe?Jacking?with?Short-Radius?Curve CHEN Si-tian, , HE Jian-xing, ZHANG Yong-xing, JIANG Yun-feng 2009, 28(5): 861-864.  DOI: 10.3969/j.issn.1674-0696.2009.05.13 Abstract ( )   PDF (583KB) ( )   During?the?construction?process?of?the?extra-shallow-underground-pipe?jacking?with?short-radius?curve,?the?problem?of?the?ground?disturbance?must?be?paid?attention?to.?Based?on?the?pipe?jacking?project?of?Hangzhou?Banshan,?the?construction?process?of?Sxtra-shallow-underground-pipe?jacking?with?short-radius?curve?is?simulated?numerically?through?the?large?scale?FEM?software?ANSYS.?And?the?model?of?extra-shallow-underground-pipe?jacking?with?short-radius?curve?is?established.?Different?jacking?speed?is?carried?out?on?the?model?to?further?explore?the?deformation?rules?of?the?extra-shallow-underground-pipe?jacking?with?short-radius?curve?at?different?jacking?speed,?and?the?recommended?value?of?jacking?speed?is?proposed. References | Related Articles | Metrics

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Metastatic?Pattern?of?the?Worst?Loading?Position?at?Slab?Corner?of??Cement?Concrete?Pavement?under?Voidage ZENG Xiao-jun, ZENG Sheng, XU Jia, GONG Xian-bing 2009, 28(5): 865-869.  DOI: 10.3969/j.issn.1674-0696.2009.05.14 Abstract ( )   PDF (386KB) ( )   Based?on?the?calculation?of?the?loading?stresses?at?both?the?middle?of?longitudinal?joint?and?the?slab?comer?when?the?void?size?is?varied,?the?metastatic?pattern?of?the?worst?loading?position?of?slab?under?voidage?is?analyzed.?And?the?effect?of?voidage?beneath?cement?concrete?pavement?slab?on?the?service?life?of?the?slab?is?also?studied.?The?research?result?shows?that?with?the?enlargement?of?voidage,?the?maximum?stress?position?transfers?from?the?middle?at?longitudinal?joint?to?the?slab?cor?ner.?The?boundary?of?voidage?area?and?non-void?area（?that?is?the?hypotenuse?of?triangle?void?area）?becomes?the?worst?loading?position?when?the?void?size?L?exceeds?0.?7m.?According?to?the?research,the?suggestion?is?given?that?the?strengthening?treatment?should?be?taken?to?prevent?slab?fracture?when?the?void?size?is?larger?than?0.4m. References | Related Articles | Metrics

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Evaluation?of?Concrete?Pavement?Performance?Based?on?Interval?Number?Method DONG Yuan-shuai, TANG Bo-ming 2009, 28(5): 870-872.  DOI: 10.3969/j.issn.1674-0696.2009.05.15 Abstract ( )   PDF (138KB) ( )   Under?the?long-term?effect?of?traffic?load?and?environment,?the?pavement?performance?becomes?attenuation?with?time,?which?has?direct?influence?on?the?driving?velocity,?safety?and?eomfortability,?as?well?as?the?transportation?economy.?In?order?to?predict?and?evaluate?the?pavement?performance,?according?to?the?current?evaluation?theory?and?method,?a?compre-?hensive?evaluation?model?based?on?the?interval?number?system?method?for?the?concrete?pavement?performance?is?established,?which?makes?pavement?maintenance?convenient?and?scientific.?This?model?is?based?On?the?reliability,?which?is?the?indicator?on?behalf?of.?Finally,?this?model?is?applied?to?a?ease?study?and?the?comparison?study?between?the?evaluation?results?got?by?the?measured?data?and?those?got?by?the?method?recommended?by?the?code?is?carried?out.?And?the?evaluation?results?of?the?two?methods?are?basically?the?same.?The?model?is?simple?to?compute?and?easy?to?be?programmed,?which?has?a?certain?value?of?application?and?promotion References | Related Articles | Metrics

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Shear?Performance?of?Asphalt?Mixtures?Based?on?Fractal?Method MA Xin, , GUO Zhong-yin, YANG Qun 2009, 28(5): 873-876.  DOI: 10.3969/j.issn.1674-0696.2009.05.16 Abstract ( )   PDF (231KB) ( )   Fractal?is?a?new?theoretical?tool?to?study?the?wide-existence?of?statistical?self-similarity?characteristics?in?the?nature?and?it?has?a?powerful?function?in?describing?and?evaluating?those?phenomena?which?feature?in?the?continuity,irregularity?and?randomicity?of?layers.?Different?shear?performance?of?asphalt?mixtures?is?determined?by?different?gradation?curve?trend.?Taking?AC-16?Ⅰ?mixtures?as?an?example,?10?representative?tendencies?are?selected?from?gradation?specification,?and?fraetal?dimensions?of?these?10?gradations?are?calculated?quantitatively?according?to?fractal?theory.?The?rule?of?different?fractal?dimensions?influencing?the?shear?performance?of?asphalt?mixtures?is?studied?through?the?tri-axial?test.?And?the?reasonable?rangd?of?fractal?dimensions?of?highway?asphalt?mixtures?at?hill?and?plain?areas?is?given?from?the?perspective?of?shear?strength. References | Related Articles | Metrics

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Orthogonal?Experiment?Analysis?on?Asphalt?Mixtures?at?Moist?Hot?Area QiN Min, LIANG Nai-xing, LU Zhao-feng, , CAO Yuan-wen 2009, 28(5): 877-882.  DOI: 10.3969/j.issn.1674-0696.2009.05.17 Abstract ( )   PDF (672KB) ( )   In?view?of?the?humid?and?rainy?weather?condition?in?South?China,?the?design?of?asphalt?mixtures?is?studied?by?the?orthogonal?experiment?with?the?consideration?of?muhiple?factors,?and?the?factors?that?influence?asphalt?mixtures?performance?such?as?powder-binder?ratio,?aggregate?types,?asphalt?types,?grading?types?and?filler?material?are?considered?synthetically,?at?the?same?time,?freeze-thaw?splitting?residual?strength?ration,?immersion?splitting?residual?strength?ration,?dynamic?stability?and?air?voids?are?also?taken?into?account?as?evaluation?indexes.?Furthermore,?the?range?and?comprehensive?analysis?method?are?applied?to?analyze?the?sensitivity?of?these?influence?factors?and?the?optimized?project?for?materials?composition?of?asphalt?pavement?at?moist?heat?area?is?pointed?out.?The?result?shows?that?powder-binder?ratio?and?the?proportion?of?coarse?aggregate?have?the?main?effect?on?the?asphalt?mixtures?performance,?and?asphalt?mixtures?performance?can?achieve?better?effect?by?means?of?adjusting?the?proportion?of?coarse?aggregate,?selecting?the?appropriate?powder-binder?ratio,?adopting?the?suitable?additives?and?so?on.?The?optimization?program?of?asphalt?mixtures?composition?at?moist?hot?area?is?＇?limestone?＋?modified?asphalt?＋?2%?hydrated?lime?＋?1.3?powder-binder?ratio?＋?60%?coarse?aggregate. References | Related Articles | Metrics

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Several?Relative?Problems?of?Epoxy?Asphalt?Solidifiers HUANG Ming, HUANG Wei-dong 2009, 28(5): 883-886.  DOI: 10.3969/j.issn.1674-0696.2009.05.18 Abstract ( )   PDF (195KB) ( )   The?epoxy?asphalt?made?in?China?has?rigorous?requirements?of?construction.?Several?new?solidifiers?are?proposed?to?use?in?component?B?through?the?change?of?viscosity-temperature?curve,?which?effectively?shorten?the?solidifying?time?to?meet?the?construction?performance,?and?provide?enough?time?to?finish?a?series?of?procedures,?including?mixing,?paving?and?grinding.?At?the?same?time,?several?common?gradations?are?evaluated?through?the?high-temperature?performance?test,?and?a?new?kind?of?gradation?method?suitable?for?the?epoxy?asphalt?is?also?proposed. References | Related Articles | Metrics

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Consolidation?Settlement?of?Sand?Drain?Subgrade?Based?on?Biot?Theory WEiHong, TANG Bo-ming, DONG Yuan-shuai 2009, 28(5): 887-891.  DOI: 10.3969/j.issn.1674-0696.2009.05.19 Abstract ( )   PDF (456KB) ( )   The?non-linear?elastic?constitutive?relation?（?Duncan-Zhang?model）?is?applied?to?the?finite?element?procedure?based?on?Biot?consolidation?theory.?The?sand?drain?subgrade?is?taken?as?the?sand?wall,?and?the?loading?process?by?classifying?in?the?actual?construction?is?simulated.?The?consolidation?settlement?and?the?rule?of?ultra-static?dissipation?of?pore?pressure?in?the?sand?drain?ground?are?studied?by?the?plane?finite?element.?Compared?with?the?measured?results,?it?is?showed?that?the?plane?finite?element?method?can?predict?the?consolidation?settlement?of?sand?drain?subgrade?accurately,?and?can?simulate?the?consolidation?settlement?in?the?loading?process?by?classifying?and?gain?the?rule?of?ultra-static?dissipation?effectively.?This?method?is?of?high?application?value?to?determine?the?embankment?construction?on?soft?ground?and?the?time?of?pavement. References | Related Articles | Metrics

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Deformation?Rules?of?Multilayer?High-Filled?Subgrade DING Jing-sheng, WU Guo-xiong 2009, 28(5): 892-894.  DOI: 10.3969/j.issn.1674-0696.2009.05.20 Abstract ( )   PDF (267KB) ( )   The?terrain?of?mountainous?highway?is?complex,?and?there?are?many?high-filled?embankments?which?easily?generate?deformation.?The?interaction?between?different?layers?will?further?affect?the?deformation?of?the?subgrade?in?muhilayer?high-filled?embankments.?With?the?consideration?of?different?geometric?shape?of?subgrade?and?the?physical?nature?of?materials,?the?deformation?rules?of?multilayer?and?high-filled?embankment?are?discussed?by?finite?element?method?（FEM）.?Numerical?examples?show?that?the?settlement?of?the?top?of?two?marginal?subgrades?is?uneven.?Compared?with?the?impact?of?the?slopeheight?and?density,?the?impact?of?the?slope-gradient?is?more?obvious.?In?order?to?reduce?the?negative?medial-lateral?elevation?difference?of?the?subgrade,?the?upper?subgrade?should?be?kept?away?from?the?lower?classes,that?is,?the?upper?slope-gradient?of?the?embankment?should?be?as?fiat?as?possible,?preferably?not?more?than?1?：?2?;?and?in?order?to?facilitate?the?consolidation?settlement?and?reduce?the?deformation?of?the?upper?embankment,?it?should?minimize?the?height?of?embankment?or?place?the?filling?materials?with?higher?density?in?lower?classes. References | Related Articles | Metrics

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Bearing?Capacity?of?Natural?Grit?Road ZHAO Yi, , LIANG Nai-xing, HU Bin 2009, 28(5): 895-898.  DOI: 10.3969/j.issn.1674-0696.2009.05.21 Abstract ( )   PDF (303KB) ( )   Through?the?implement?of?compaction?tests?of?natural?grit?with?different?natural?gradation?and?design?dense?gradation,?the?primary?factors?influencing?maximum?dry?density?and?optimum?water?content?with?different?gradation?composition?are?analyzed.?Under?eonditions?of?maximum?dry?density?and?optimum?water?content,?the?resilient?modulus?test?of?D?×?H?=?308?mm?×?290?mm?large?test?sample?has?been?carried?out?for?natural?grit?of?natural?gradation?and?dense?gradation,?then?the?bearing?capacity?of?natural?grit?road?with?different?gradation?composition?is?analyzed. References | Related Articles | Metrics

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Using?FEM?Strength?Reduction?Method?Based?on?ANSYS?to??Solve?Slope?Safety?Coefficients LIU Lin-chao, LiANG Bo, DIAO Ji 2009, 28(5): 899-901.  DOI: 10.3969/j.issn.1674-0696.2009.05.22 Abstract ( )   PDF (435KB) ( )   A?kind?of?FEM?strength?reduction?method?to?analyze?the?slope?stability?is?introduced.?The?basic?principle?of?this?method,?the?physical?connotation?of?the?safety?coefficients,?the?selection?of?yield?criterion?and?flow?rule,?and?the?damage?criterion?of?slope?and?so?on?are?discussed.?A?new?group?of?cohesion?and?internal?friction?angles?are?obtained?by?decreasing?the?slope?strength?coefficients,?including?the?cohesion?and?internal?friction?angles?in?the?case?study.?And?then?these?coefficients?are?input?to?the?computer?to?calculate.?When?these?coefficients?are?non-onvergence,?the?reduction?coefficients?at?this?point?are?safety?coefficients.?The?results?show?that?calculating?safety?coefficients?of?the?slope?by?ANSYS?is?of?certain?practice?and?reliability. References | Related Articles | Metrics

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Influence?of?Permeability?of?Anti-slide?Piles?on?Governance?Effect TANG Xiao-song, , ZHENG Ying-ren, , TANG Fen, YE Hai-lin, 2009, 28(5): 902-906.  DOI: 10.3969/j.issn.1674-0696.2009.05.23 Abstract ( )   PDF (851KB) ( )   At?present?anti-slide?piles?have?been?widely?used?in?slope?of?reservoir?banks,?such?as?the?governanace?of?slopes?in?Three?Gorges?Reservoir?area.?Since?most?anti-slide?piles?are?established?during?the?dry?season?when?the?water?level?is?low,?the?piles?would?hinder?the?flow?of?underground?water?when?the?water?level?changes,?which?causes?influence?on?the?safety?evaluation?of?the?governance.?From?the?quantitative?analysis?given,?the?method?ignoring?the?permeability?of?piles?would?underestimate?the?safety?of?governance,?make?the?design?conservative?and?cause?some?waste.?At?the?same?time,?the?top?of?embedded?anti-slide?piles?is?soil,?which?comparatively?increases?the?permeability?of?the?section.?Therefore,?embedded?anti-slide?piles?are?more?economical?and?reasonable?if?the?safety?of?governance?can?be?ensured. References | Related Articles | Metrics

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Genetic?Algorithm?Analysis?on?Global?Stability?of?Landslide?and?Its?Application WU Lian-ying, CHEN Hong-kai 2009, 28(5): 907-910.  DOI: 10.3969/j.issn.1674-0696.2009.05.24 Abstract ( )   PDF (392KB) ( )   Genetic?algorithm?is?a?kind?of?fully?optimized?algorithm?to?simulate?the?process?of?biological?evolution.?The?landslide?global?stability?analysis?is?based?on?genetic?algorithm,in?which?landslide?stability?coefficients?are?taken?as?the?objective?functions?;?N?slides?of?slope?are?selected?stochastically?as?initial?population,?and?center?coordinates?and?radius?of?the?slide?are?taken?as?variants?to?simulate?the?process?of?biological?evolution.?The?slide?with?minimum?stability?coefficients?is?searched?out?by?the?survival?of?the?fittest?mechanism.?This?method?is?used?to?analyze?the?global?stability?of?Simianshan?landslide?and?has?confirmed?its?higher?reliability?in?analyzing?the?complex?anisotropic?slide?by?contrasting?with?the?values?got?by?transfer?coefficients?method. References | Related Articles | Metrics

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Influence?of?Impervious?Body?of?Dam?Foundation?on?Saturation?Line?and?Seepage LUO Sheng-ping, XU Guang-xiang, ZHONG Liang 2009, 28(5): 911-914.  DOI: 10.3969/j.issn.1674-0696.2009.05.25 Abstract ( )   PDF (377KB) ( )   Based?on?the?numerical?results?got?by?finite?element?method,?the?influences?of?multiple?locations?of?impervious?curtain?on?the?saturation?line?and?seepage?are?discussed.?The?general?tendency?of?saturation?line?and?seepage?change?is?elaborated,?and?the?conclusion?that?the?most?favorable?location?of?impervious?body?of?homogeneous?dam?foundation?is?on?the?dam?axis?and?the?upper?part?of?dam?axis?is?drawn,?however,?with?the?increase?of?kx/ky,?the?impervious?effect?of?the?impervious?body?of?dam?foundation?will?decrease?gradually. References | Related Articles | Metrics

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Causes?of?Mine?Debris?Flow?Disaster?and?Its?Countermeasures LIU Li, , CHEN Hong-kai 2009, 28(5): 915-921.  DOI: 10.3969/j.issn.1674-0696.2009.05.26 Abstract ( )   PDF (455KB) ( )   Mine?debris?flow?is?caused?by?centralized?exploitation?of?mineral?resources,?which?are?mainly?distributed?in?the?area?that?is?teemed?with?mineral?resources.?In?view?of?the?frequent?occurrence?of?the?debris?flow?accidents?in?some?mines?at?home,the?mechanism?of?the?mine?debris?flow?occurrence?is?analyzed.?It?is?pointed?out?that?the?terrain?and?landform,?solid?substance?origin,?hydrodynamic?condition?and?human?factors?are?the?necessities?for?the?formation?of?mine?debris?flow,?and?the?formation?of?mine?debris?flow?is?expounded.?The?corresponding?engineering?suggestions?on?the?direction?and?contents?of?the?future?research?on?mine?debris?flow?are?put?forward. References | Related Articles | Metrics

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Queuing?Model?for?U-Turn?Mouth?of?Bi-directional?Streets LIU Ren-wen 2009, 28(5): 921-925.  DOI: 10.3969/j.issn.1674-0696.2009.05.27 Abstract ( )   PDF (282KB) ( )   Because?the?empirical?design?approach?is?applied?to?the?former?design?of?U-turn?mouth,?there?are?always?some?inevitable?blemishes.?In?order?to?make?up?with?these?blemishes,?mathematical?knowledge?should?be?used?to?describe?the?U-turn?mouth.?Queuing?model?is?a?good?tool?to?modelize?the?U-turn?mouth?,which?theoretically?elaborates?the?nature?of?queuing?model?and?queuing?parameters.?Based?on?the?nature?of?queuing?model,?the?arrival?rate?and?dissipation?rate?are?the?cores?of?queuing?study.?In?U-turn?system,?probability?theory?is?mainly?used?to?deduce?theoretically.?On?the?theoretical?basis,?the?length?of?U-turn?mouth?can?be?determined?through?the?actual?traffic?survey,?and?whether?the?traffic?control?should?be?taken?for?U-turn?mouth?can?also?be?determined. References | Related Articles | Metrics

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Quantitative?Analysis?Index?and?Method?for?Guide?Signs?at?Intersection SHA Zhi-ren, HUANGMin 2009, 28(5): 926-929.  DOI: 10.3969/j.issn.1674-0696.2009.05.28 Abstract ( )   PDF (220KB) ( )   Aiming?at?the?situation?that?no?clear?definitions?of?the?contents?of?guide?signs?and?the?layout?of?corresponding?coordinate?equipment?have?been?made?in?China?currently,?two?methods?are?proposed?to?carry?out?the?quantitative?analysis?about?the?guide?signs?at?intersection,which?are?the?collection?and?expansion?of?the?existing?analysis?method?and?indexes?of?road?guide?signs.?The?two?methods?are?segment?analysis?and?regional?analysis.?A?series?of?quantitative?analysis?indexes?which?are?applied?to?the?method?mentioned?above?are?proposed,?including?the?rate?of?setting?guide?signs,?the?range?of?guide?and?the?guiding?relationship?between?paths.?And?then?a?case?study?is?carried?out?in?Haizhu?Center?District?of?Guangzhou.?Based?on?the?investigation?and?data?collection?of?the?actuality?of?guide?signs?at?main?trunk?roads?in?this?region,?typical?trunk?roads?and?traffic?regions?are?selected?to?carry?out?this?case?study. References | Related Articles | Metrics

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Competitiveness?of?Seaports?in?Southwest?Area?and??Attraction?to?Land-Port?in?Guizhou GUAN Xiao-qing 2009, 28(5): 930-933.  DOI: 10.3969/j.issn.1674-0696.2009.05.29 Abstract ( )   PDF (278KB) ( )   Land-port?construction?can?improve?the?transportation?system?of?foreign?trade,?and?can?also?change?the?phenomenon?that?seaport?transportation?is?the?first?choice?for?the?export?containers?in?southwest?area.?In?order?to?analyze?the?port?choice?behavior?of?the?exported?containers?in?the?Southwest?area?if?a?land-port?is?established?in?Guizhou,?the?attraction?model?of?the?seaports?to?land-port?based?on?the?gravity?law?is?developed,?and?the?system?to?evaluate?the?comprehensive?competitiveness?of?seaports?is?established.?Furthermore,?a?proposal?to?calculate?the?competitiveness?with?analytic?hierarchy?process?（AHP）?approach?is?given.?Finally,taking?the?ports?available?in?Southeast?area?as?the?research?object,?the?probabilities?that?the?exported?containers?choose?the?seaports?in?virtue?of?land-port?in?Guiyang?are?analyzed,?which?provides?the?theoretical?basis?for?the?construction?of?thoroughfare?to?the?sea?and?the?marketing?of?seaports?in?Southwest?area References | Related Articles | Metrics

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Influence?Study?of?Xiangli?Wharf?Engineering?on?Waterway YANG Xiao-wen, XU Guang-xiang 2009, 28(5): 934-937.  DOI: 10.3969/j.issn.1674-0696.2009.05.30 Abstract ( )   PDF (685KB) ( )   Combine?with?the?practical?engineering?example,?the?navigation?flow?conditions?before?and?after?the?wharf?construction?are?analyzed?by?plane?two?dimensional?numerical?models.?Through?the?calculation?and?analysis?of?water?surface?profile?and?flow?field?before?and?after?the?wharf?construction,?it?is?indicated?that?the?wharf?engineering?occupies?a?small?discharge?area?and?has?a?little?impact?on?the?range?of?the?flow?field;the?engineering?has?little?influence?on?the?navigation?and?the?fluvial?process,?which?verifies?the?feasibility?of?the?wharf?construction References | Related Articles | Metrics

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Fluvial?Process?and?Channel?Regulation?of?Wuqiao?Location?Reach CHENG Chang-hua, KONG De-hua 2009, 28(5): 938-941.  DOI: 10.3969/j.issn.1674-0696.2009.05.31 Abstract ( )   PDF (518KB) ( )   The?construction?of?a?large?number?of?river-crossing?bridges?makes?the?natural?reach?turn?into?the?bridge?location?reach.?The?fluvial?process?and?channel?regulation?of?bridge?location?reach?has?been?increasingly?focused.?Taking?Wuqiao?location?reach?as?the?research?object,?which?is?of?certain?representativeness,?the?features?of?its?fluvial?process?are?generally?summed?up?and?the?strategies?to?regulate?the?channel?are?also?discussed?by?the?model?test.?Finally,it?is?cleared?that?the?optimization?scheme?can?regulate?Wuqiao?reach?reasonably. References | Related Articles | Metrics

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Water?Chemistry?and?Nitrate?Pollution?of?Surface?Water?and??Groundwater?in?Liangtan?River LIU Xiang-chao, , ZHOU Zheng-hui, SONG Xian-fang, XiA Jun, TANG Chang-yuan, , ZHANG Yi-zhang 2009, 28(5): 942-947.  DOI: 10.3969/j.issn.1674-0696.2009.05.32 Abstract ( )   PDF (457KB) ( )   Nitrate?pollution?level?of?the?surface?water?and?groundwater?in?the?Liangtan?River?basin?at?Three?Gorges?Reservoir?area,?which?is?influenced?by?human?activities,is?measured?by?water?chemistry?technology.?The?results?show?that?：?the?surface?water?from?the?middle-upper?reaches?to?the?basin?is?polluted,?and?the?pollution?of?lower?reaches?is?inclined?to?a?more?serious?degree;?the?groundwater?is?also?serious?polluted?due?to?the?influence?of?surface?water,?and?Nitrate?and?Nitrogen?concentration?of?groundwater?inclines?to?exceed?the?qualified?standard.?By?the?impact?of?river?water?infiltration,?Nitrate?and?Nitrogen?concentration?of?groundwater?in?Liangtan?River?shows?a?sharp?increase?from?the?upper?reaches?to?the?middle?reaches.?Nitrate?concentration?of?groundwater?in?upstream?and?middle?reaches?exceeds?the?qualified?standard?of?10?mg/L,?and?the?concentration?of?that?inclines?to?lower?at?the?downstream?and?the?mouth?of?river. References | Related Articles | Metrics

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Development?of?Automobile?Braking?Analysis?Module?Based?on?ADAMS ZHOU Jun, DU Zi-xue 2009, 28(5): 948-951.  DOI: 10.3969/j.issn.1674-0696.2009.05.33 Abstract ( )   PDF (457KB) ( )   With?the?development?of?virtual?prototype,?kinds?of?simulation?analysis?software?have?been?widely?used?in?automobile?manufacturing.?However,?the?users?must?spend?much?time?in?familiarizing?the?tedious?commands?and?comprehend?correlative?theoretical?knowledge?of?the?software,?which?decreases?the?efficiency.?So?the?design?of?braking?analysis?module?is?put?forward?based?on?ADAMS/View.?The?user?can?achieve?the?specific?braking?simulation?analysis?rapidly?by?using?the?module,?which?can?maximally?shorten?periods?of?development?and?reduce?the?costs.?At?the?same?time,?the?development?of?related?modules?for?realizing?automatic?modeling,?the?vehicle?performance?analysis?and?the?systematization?of?these?modules?are?also?advised.?The?idea?of?secondary?development?of?existing?software?can?improve?the?capability?of?independent?development?and?can?also?be?popularized?to?other?manufacturing?industries. References | Related Articles | Metrics

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Construction?of?Information-Based?Surveying?and?Mapping?Criteria?in?Chongqing ZHANG Zhi-qing, WU Hong-bo, PU De-xiang 2009, 28(5): 952-955.  DOI: 10.3969/j.issn.1674-0696.2009.05.34 Abstract ( )   PDF (183KB) ( )   Based?on?the?development?background?of?information-based?surveying?and?mapping?technology,?the?situation?of?establishing?the?national?information-based?surveying?and?mapping?criteria,?and?the?actual?situation?of?establishing?the?spatial?data?infrastructure（SDI）?in?Chongqing,?the?foundational?contents?of?Chongqing?geographic?infrastructure?data?construction?are?summed?up,?considering?the?general?requirements?of?national?spatial?data?base?（NSDB）and?the?basic?requirements?of?various?application?fields?in?Chongqing?for?geographic?information?data.?Furthermore,?the?contents?of?establishing?the?criteria?system?and?its?protection?mechanism?are?discussed.?The?situation?of?criteria?which?have?been?already?finished?is?simply?introduced,?and?the?problems?as?well?as?the?corresponding?suggestions?in?the?criteria?construction?are?proposed. References | Related Articles | Metrics

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Research?on?Optimal?Distribution?Routing?in?Catering?Industry TU Yi-lin, HUO Jia-zhen 2009, 28(5): 956-959.  DOI: 10.3969/j.issn.1674-0696.2009.05.35 Abstract ( )   PDF (239KB) ( )   With?the?rapid?development?and?increasing?competition?in?catering?industry,?catering?enterprises?are?urged?to?control?their?logistics?cost?,for?the?reasonable?distribution?scheme?is?essential?to?control?the?cost,?to?enhance?the?efficiency?and?competitiveness?of?the?enterprise.?Aiming?at?the?characteristics?of?the?catering?industry,?a?scheme?is?proposed.?That?means?the?distribution?nodes?are?determined?according?to?cargo?categories.?Furthermore?,the?selection?of?distribution?nodes?and?the?routing?alteration?scheme?are?studied?respectively.?The?concept?of?total?cost?proposed?here?is?applied?to?the?shortest?path?approach?to?obtain?the?optimal?routing?in?the?case?study,?which?indicates?the?integral?concept?of?the?cost?is?of?great?importance?in?the?distribution?planning. References | Related Articles | Metrics

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Comparison?Method?of?Real?Estate?Appraisal?Based?on?GIS?and?Fuzzy?Theory HUANG Hai, , LI Shuang, YANG Qing-wei 2009, 28(5): 960-963.  DOI: 10.3969/j.issn.1674-0696.2009.05.36 Abstract ( )   PDF (166KB) ( )   In?order?to?overcome?the?deficiencies?of?comparison?method?for?real?estate?appraisal?in?the?aspects?of?cases?selection?and?their?adjustment,?GIS?is?proposed?to?implement?the?management?and?initial?selection?of?the?transaction?cases?;fuzzy?similarity?degree?is?proposed?to?do?the?selection?of?comparable?cases?;?and?fuzzy?comprehensive?appraisal?is?adopted?to?adjust?their?price?for?the?appraisal?of?the?real?estate.?A?case?study?is?given?to?verify?the?feasibility?and?effectiveness?of?this?naethod?in?solving?the?problems?of?the?management?and?selection?of?comparable?cases?as?well?as?price?adjustment,?which?improves?the?correctness?of?the?evaluation. References | Related Articles | Metrics

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Constituent?System?of?Regional?Supporting?Capacity?of?Science?and?Technology??and?Its?Evaluation WEI Guang-xing, HUANG Ting 2009, 28(5): 964-968.  DOI: 10.3969/j.issn.1674-0696.2009.05.37 Abstract ( )   PDF (228KB) ( )   Science?and?technology?can?promote?regional?economic?development?,while?the?innovation?and?progress?of?science?and?technology?depends?on?the?regional?supporting?capacity?of?science?and?technology（RSCST）.?Firstly,?the?constituent?system?of?RSCST?is?determined?and?analyzed,?and?it?is?pointed?out?that?RSCST?is?decided?by?the?system?guarantee,?the?resource?supply?and?the?technological?industrialization.?Then,?fuzzy?comprehensive?evaluation?model?to?evaluate?RSCST?is?established,?and?this?model?is?applied?to?the?evaluation?of?Chongqing?RSCST.?The?research?results?can?promote?the?development?of?RSCST?and?provide?scientific?basis?to?the?decision?of?regional?PST. References | Related Articles | Metrics

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A?Revised?Algorithm?to?Solve?Container?Ship＇s?Stowage?Problem WEI Jia-jun, 2009, 28(5): 969-972.  DOI: 10.3969/j.issn.1674-0696.2009.05.38 Abstract ( )   PDF (362KB) ( )   Container?ship＇s?stowage?problem?is?a?key?step?in?the?process?of?container?transportation?at?sea.?Based?on?first?adaptive?decreasing?algorithm?and?optimal?adaptive?decreasing?algorithm,?a?revised?optimal?adaptive?decreasing?algorithm?for?container?ship＇s?stowage?problem?is?proposed.?The?simulation?results?indicate?that?the?revised?algorithm?is?sound?to?solve?the?problem?of?container?ship＇s?stowage. References | Related Articles | Metrics

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An?Improved?SVM?Multiclass?Classification?Algorithm?Based?on?DAG WANG Xiao-feng 2009, 28(5): 973-975.  DOI: 10.3969/j.issn.1674-0696.2009.05.39 Abstract ( )   PDF (216KB) ( )   Aiming?at?the?problem?that?the?SVM?multiclass?classification?algorithm?based?on?DAG?doesn＇t?use?an?effective?constructing?algorithm?of?directed?acyclic?graph,?an?improved?SVM?multiclass?classification?algorithm?based?on?DAG?is?put?forward.?The?class?distance?of?clustering?is?taken?as?the?basis?of?hierarchical?classification.?The?experiment?results?show?that?the?new?method?has?higher?classification?accuracy?than?the?original?algorithm?does. References | Related Articles | Metrics

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Several?Exploration?Methods?to?Prove?the?Cauchy?Mean?Theorem ZOU Zhao-nan, TAN Yuan-shun 2009, 28(5): 976-978.  DOI: 10.3969/j.issn.1674-0696.2009.05.40 Abstract ( )   PDF (150KB) ( )   Taking?the?Cauehy?Mean?Theorem?as?the?research?object,?seven?exploration?methods?are?given?to?prove?the?Cauchy?Mean?Theorem.?The?application?of?exploration?teaching?in?the?process?of?proving?the?theorem?is?discussed,?which?asks?for?higher?demands?of?the?Mathematics?teaching?at?university. References | Related Articles | Metrics