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15 April 2010, Volume 29 Issue 2 Previous Issue    Next Issue

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Mechanism of Sliding Block in Bridge Seismic Designing LIU Rong-can，WANG Ke-cheng，TANG Hong-mei，CHEN Hong-kai 2010, 29(2): 171-173.  Abstract ( )   PDF (218KB) ( )   Based on energy dissipation theory and seismic dynamic response analysis this paper studied on the variation trends of sliding block and the bridge span structures bearing under the different levels of seismic loading. The results revealed the sliding block relying on silpping generated friction force for consumption part of the seismic load in the earthquake， so the bridge span structures does not make more rigidity to generate huge earthquake force that feedback to the lower part of the piers and pile foundation，while sliding block controlled the bridge damage within a certain range，the block took on largely energy，causing the main structure small damage，more damaged block was carried up quick fix easily after the earthquake. References | Related Articles | Metrics

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Deck Layout Influence of Continuous Rigid-frame Bridge between Updated and Old Specification HUANG Ya-ning，ZHOU Shui-xing，WANG Yan，CAO Shuai 2010, 29(2): 174-176.  Abstract ( )   PDF (257KB) ( )   “Design Specification of Highway Reinforced Concrete and Pre-stressed Concrete Bridges and Culverts”in 2004 edition changed a lot compared with that in 1985 edition. Taking A’Pengjiang Bridge with a (90m + 170 m + 90 m) continuous rigid-frame bridge as an example，some influence factors and characters were discussed about deflection of prestressed concrete continuous rigid-framed bridge due to different provisions between updated and old specification“Design Specification of Highway Reinforced Concrete and Pre-stressed Concrete Bridges and Culverts”issued in 2004 and 1985 separately. The results show that“2004 specification”modifications included crack resistance，calculation pattern of creep and structural stiffness result in a lower deformation than“1985 specification ”. The long term growth factor to camber formula is introduced to camber，which leads to a more beautiful and reasonable deck layout. References | Related Articles | Metrics

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Discussions on Characteristics of Construction Control for Extra-dosed Partially Cable-stayed Bridges SUN Ce-shi，ZHOU Shui-xing，TONG Jian-sheng 2010, 29(2): 177-179.  Abstract ( )   PDF (279KB) ( )   Extra-dosed partially cable-stayed bridges are different from common cable-stayed bridges in stress control so that they have their own characteristics of construction control. Take Guijiugou Bridge as an example，we discussed the characteristics of construction control for extra-dosed partially cable-stayed bridges in terms of three aspects: geometry control， stress control and cable-tension control. We presented some possible problems and also proposed the solutions regarding to structure size and stress characteristics as well as the method for the practical construction control. References | Related Articles | Metrics

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Optimization for Steel Truss Construction Scheme Based on Fuzzy Evaluation YANG Peng-xi，YAO Gang，WU Xiao-qiong，LI Peng 2010, 29(2): 180-182.  Abstract ( )   PDF (129KB) ( )   In light of the actual project，this article established fuzzy evaluation model of long-span steel truss construction scheme optimization. According to the project survey and the index-built principles，this article established the evaluation index system through the improved AHP method to determine the weight of each evaluation index and classified the evaluation index level. Making feasible construction schemes，introducing of set-valued statistical method to construct the membership matrix，and using the theory of fuzzy mathematics to calculate the comprehensive superior values of schemes，this article ranked the values，then determined the optimized scheme. References | Related Articles | Metrics

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Study on the Speed Limit of Highway Tunnels Based on Visual Adaptation MU Hui，YANG Shao-wei，ZHAO Yi-fei，PAN Bing-hong 2010, 29(2): 183-184.  Abstract ( )   PDF (146KB) ( )   By analyzing the impact of tunnel on the driver′s vision and psychology，changes in speed of vehicle through the tunnel were educed and the length of speed limit in the tunnel was determined. Based on the quantitative analysis of the relationship between variety velocity of pupil area and road safety，the critical speeds of safe driving at the tunnel’s entrance and exit were obtained concerning visual adaptation. The speed limit value of road tunnel is determined，combined with changes of vehicle speed within tunnel speed limit section and the tunnel’s own conditions. References | Related Articles | Metrics

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Two-layer Cement Concrete Pavement Design Based on Equal Strength Theory DAI Xue-zhen 2010, 29(2): 185-187.  Abstract ( )   PDF (167KB) ( )   The paper analyses the characteristic of two-layer cement concrete slab. The research directed the current“Highway Cement Concrete Pavement Design Standards”，and utilized Equal Strength Theory and geometric derivation method. The results show that under the vehicle load effect，the stress on the contact point is proportional to the thickness and modulus， in spife of the plane size of the upper and lower slab. The appropriate thickness range of the upper and lower slab can be drawn though this relationship and equal strength theory. References | Related Articles | Metrics

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Study on Boundary Equations between Damage Zone and Fracture Zone for Wing Cracks in Concrete LI Rui，XIANG Zhong-fu 2010, 29(2): 188-189.  Abstract ( )   PDF (195KB) ( )   The wing cracks due to unidirectional compression in concrete were analyzed by coupling the Sidoroff damage model with fracture mechanics. Boundary equations between damage zone and fracture zone were derived to determine the radial sizes of initial damage and fracture zones due to wing cracks. Finally，the coordinate of initial cracking point of different wing cracks was determined and new feasibility idea was provided for study the wing cracks intended in concrete. References | Related Articles | Metrics

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Concrete Strength under Sustained Loading ZHENG Dan，LI Xin-xin 2010, 29(2): 190-193.  Abstract ( )   PDF (286KB) ( )   Concrete strength under long-term sustained loading was investigated in this paper. By analyzing deformation behavior and damage evolution mechanism of concrete under sustained loading，and by comparing concrete creep and fatigue behavior similarity，the damage evolution ratio was assumed in proportion to strain increasing ratio. The envelope of concrete stress-strain relationship was analyzed with consideration of microcracks evolution in concrete material. The relationship between stress level and critical damage strain was then established. Concrete real strength under sustained loading was achieved. Comparing with existed experiments shows a good correlation. References | Related Articles | Metrics

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Study on the Properties of Sulphur Extended Asphalt Mixture and the Mechanism of Modifying YANG Xi-wu 2010, 29(2): 194-198.  Abstract ( )   PDF (172KB) ( )   A new method of modifying asphalt with sulphur is presented and the properties of SEAM modified asphalt mixture are tested. The test results show that，as the agent of SEAM is more than 10 percent，the high temperature stability and fatigue life of sulphur extended asphalt mixture can be obviously improved，the high temperature stability and fatigue life individually increase 171 percent and 187 percent respectively，and the low temperature property is approached to the common asphalt mixture. The mechanism of sulphur modified asphalt is studied with the infrared adsorption spectrum analysis. The infrared adsorption spectrum test results indicates that as the ratio of sulphur to asphalt increases from 20 percent to 30 percent. The sulphur can react the asphalt，and during the curse of reaction，some new chemical compounds with H-、 S-H、RO-SO-OR、RO-SO2-OR、R-SO2-R etc. are produced in asphalt. It is concluded that the mechanism of sulphur improving high temperature properties of asphalt is the bonding force among asphalt molecules and the chemical composition of asphalt are changed by the sulphur. References | Related Articles | Metrics

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Test Study on Water Affection on the Fatigue Performance of Asphalt Pavement GAO Zhi-jie，LIANG Nai-xing，XIAO Xiong 2010, 29(2): 199-202.  Abstract ( )   PDF (210KB) ( )   Using the splitting fatigue test and simulating water damage of asphalt concrete via freeze-thaw，we analyzed and compared water damage’s affection on the fatigue performance of asphalt concrete AC-25 in terms of the following aspects: the difference of destroying forms，of fatigue parameters，of graduation. The results show that (i) the failure stiffness module decreased by 27% after one cycle of freezing and thawing，(ii) the fatigue lifespan of asphalt concrete shortened a lot in the water damage condition，(iii)the fatigue lifespan of sample asphalt concrete became more sensitive to stress level， (iv) the anti-fatigue performance of asphalt concrete ranged from the superiority to the inferiority as the follows: coarse grading，fine grading，gradation intermediate value. References | Related Articles | Metrics

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Stress Analysis for Asphalt Overlay Reflection Crack on Old Cement Concrete Pavement HUANG Jin，WU Jing-liang，LI Xin，TANG Jian-qiang 2010, 29(2): 203-206.  Abstract ( )   PDF (339KB) ( )   The thesis analyses the stress characteristics of reflection crack on the most unfavorable place of the load through the finite element modeling for asphalt overlay on old cement concrete pavement by ANSYS software and the diversification of the stress intensity factor K in the light of fracture mechanics. The calculation results indicate that the slip affected stress intensity factors KI and KII governing pavement crack propagation trend to decrease with the thickness increase of asphalt overlay under traffic loading and temperature. The stress intensity factor on the crack tip increases with the modulus increase of asphalt overlay. Furthermore，the crack resistance is affected by temperature drop range and axle load difference. References | Related Articles | Metrics

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Study on Parameters Influencing the Effect of Anti－reflective Cracks in Asphalt Overlay of Anti-cracking Material with Gray Correlation Entropy Method WEI Gang，YANG Wen-jun，ZHAN Qi-qi，ZHU Hong-zhou 2010, 29(2): 207-210.  Abstract ( )   PDF (328KB) ( )   Paving anti-cracking materials is the major measure to prevent reflective cracks in asphalt overlay，the parameters of the material have great impact on anti-reflective cracks. Firstly，based on fracture mechanics theory，the stress intensity factor of the overlay was calculated by means of finite element analysis program，then，the impact of width，thickness， modulus and adhesive coefficient of anti-cracking materials on anti-cracking effect were analyzed through grey correlation entropy. The results show that adhesive property is the most important parameter which can influence the effect of antireflective cracks. References | Related Articles | Metrics

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Drainage System for Freeway with Low Filled Embankment in Plain Area ZHANG Hong-liang，WANG Bing-gang，ZHANG Chun-lei，HAO Hua-xi 2010, 29(2): 211-215.  Abstract ( )   PDF (205KB) ( )   The drainage systems for the channel lower than the ground and the section with the slope less than the deposit slope were studied. Four types of drainage systems for the channel lower than the ground，including seepage well，waterproof shed，evaporation pool and pump station，were suggested and compared. The drainage system in the section with the slope less than the deposit slope included the collecting water ditches and the rapid gutters in the slopes of subgrade etc. Results show that，waterproof shed can be used widely，evaporation pool can only be used in arid area，and pump station can be used in intersections and important channels; the drainage system for the section with the slope less than the deposit slope is stable，and has good economic efficiency and can be used for long time without deposit. References | Related Articles | Metrics

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Analysis on Load Deformation of Anchorage Section Based on Load Transfer Method XU Xi-bin，LIU Tao，CHU Guang-hui 2010, 29(2): 216-219.  Abstract ( )   PDF (258KB) ( )   The basic equation of anchorage section is derived based on load transfer method. This paper derived the analytical expression of anchorage sections’stress distribution，combining the displacement solution to Kelvin problem. The results show that the bolt body diameter，external load and the ratio of bolt body’s elastic modulus and rock’s shear modulus affected the stress level of anchorage section. The calculation finds that: (i)when bolt diameter bolts up to a certain extent， anchorage section’s maximum shear stress has a rapid increase; (ii)under a higher initial force conditions，the front of anchorage section has a clear stress concentration; (iii) a smaller ratio of bolt body’s elastic modulus and rocks’shear modulus is conducive to uniform the stress distribution of anchorage section. References | Related Articles | Metrics

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Influence on Slope Stability of Physical-mechanical Property of Clayer Thin Interlayer in Red Sandstone GONG Yi-fang，JIN Fu-xi，ZHANG Ke-neng，ZHOU Bin 2010, 29(2): 220-223.  Abstract ( )   PDF (217KB) ( )   Slope destabilization and land slip usually happened while building the speedway in red sandstone area. On the base of the research findings about properties of the red sandstone and slope stability，the result of the indoor test on physical- mechanical property of clayer thin interlayer in red sandstone was mainly introduced. The variational rule of the shear strength by changing the water ratio of the thin interlayer was researched. The influencing on stability of slope with physicalmechanical property of the clayer thin interlayer in red sandstone were analysed. The research results indicate that the effect of the Water Sensitivity of the clayer thin interlayer is strong，and the clayer thin interlay does adverse effect on stability of slope. References | Related Articles | Metrics

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Experimental Research of Electrical Resistivity Tomography Detection Method in Leakage Passage in Earth-rock Dam YU Dong，ZHAO Ming-jie，YANG Jing-guo 2010, 29(2): 224-226.  Abstract ( )   PDF (234KB) ( )   Based on the resistivity imaging detection test of Earth-rock Dam Leakage passage，the arrangement affects the leakage passage inversion image in three different arrangements as follows: the inversion image of resistivity can reflect the range of leakage passage under three kinds of arrangement，and Wenner array inversion image is the best. But the three kinds of inversion image can not reflect accurately the location of the leakage passage. References | Related Articles | Metrics

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Summary on Methods to Predict Soil Bank Failure of Mountain Reservoir ZHANG Liang ，WANG Jun-jie ，YAN Zong-ling 2010, 29(2): 227-232.  Abstract ( )   PDF (196KB) ( )   The bank failure is a geological disaster which may greatly threat the security of property and lives of the people along the bank，and simultaneously affect the reservoir storage capacity. Several methods usually used to forecast reservoir bank failure are introduced，the characteristics and the suitability of each method is also summarized. Forecasting methods of bank failure are summarized as follows: take Zuoluotaliaofu method as the condition analogy graphical solution representing， take Kondratiev as mathematical analysis method representing，balanced cross－section method，dynamic method，Xu Ruichun′s bank failure forecast graphic solution certain revisions，in advance information method，numerical simulation method，etc. In project concrete application，combining the characteristics of mountain reservoirs，persisted the theory and the practice unifies principle，selected the reasonable method according to the reality. References | Related Articles | Metrics

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Research Status and Trend about Dynamics of Debris Flow LIU Li，CHEN Hongkai 2010, 29(2): 233-239.  Abstract ( )   PDF (201KB) ( )   Transforming mechanism of mechanical model，dynamic behavior study，dynamics test are analyzed and evaluated. The analysis shows that there are some limitations about the application of all kinds of mechanical model. The application range of the empirical formulas about velocity，flow，impact force，abrasion force is narrow and regional. The test equipment can not acquire instantaneous dynamic data of debris flow. In view of these problems，the paper proposes research ideas to solve these problems. The velocity spectrum and impact force spectrum are proposed with the spectrum analysis and measuring effective instantaneous velocity of debris flow with researching and developing test equipments. It is important to learn motion mechanism of debris flow. References | Related Articles | Metrics

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Analysis of Main Factors Influencing Landslide and Debris － flow Dam’s Break along South Section of Sichuan － Tibet Highway GUO Guo-he，WU Guo-xiong，CHENG Zun-lan 2010, 29(2): 240-243.  Abstract ( )   PDF (217KB) ( )   The natural environment along south section of Sichuan － Tibet highway (in Tibet) is unique and fragile，which has led to many large scales of landslides and debris － flows blocking the main rivers，and caused severe catastrophe by outburst floods. Though field investigation of several typical dams along the section of Ranwu town to Peilong town in recent decades，main factors impacting the dam break had been identified through the methods of laboratory test and theoretical analysis. The results showed that the dam break is influenced by various factors such as the runoff and the channel characteristics of the main river，properties of materials，geometry and structural characteristics of the blocking dam and the angle between the dam and the main river，of which the downstream slope and the height of the dam are key influencing factors， affecting the break timing and the scale of floods. References | Related Articles | Metrics

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Study on Interactive Design Method of Cross Section Based on the Linkage between Graphics and Data WANG Wan-qiu，ZHUANG Guo-fang，PU Hao 2010, 29(2): 244-247.  Abstract ( )   PDF (235KB) ( )   As road cross section is featured with large volume of data，complicacy and diversity of forms of cross section，its automatic design method was first researched. Then，custom entity technology of ObjectARX was applied to customize the cross section entity，based on ideals of object-attributes. Combined with reactor and notification technology，the interactive design methods based on the linkage of graphics and data were developed. Finally，through some examples of the interactive design methods，results showed that the interactive design methods presented had a high degree of automation and dynamic visibility. References | Related Articles | Metrics

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Carpool Priority Planning Methods in Central Area of Large Cities WANG Wei-li 2010, 29(2): 248-253.  Abstract ( )   PDF (285KB) ( )   In view of the traffic characteristics in central area of China＇s large cities，this article analyses the factors of carpool priority planning. Drawing on the experience of developed countries，this article presents planning contents of carpool priority. Based on traffic surveys and related planning method，this article presents recommendations of the carpool priority planning for the Shanghai central area. References | Related Articles | Metrics

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Study on Automatic Generating Designing Plan of Traffic Markings Based on GIS Platform ZHOU Wei-jun，HUANG Min，SHA Zhi-ren 2010, 29(2): 254-256.  Abstract ( )   PDF (301KB) ( )   Traffic markings were divided into longitudinal markings，latitudinal markings and spot symbol markings according to their geometrical property and directional relationship between road geometrical centerlines and them. Data model oriented to automatic generating designing plan of traffic markings was built，it can describe relationship between road network data and traffic markings，and support automatic generating designing plan of traffic markings based on GIS platform. To demonstrate this research，some parts of road network region from Zhuhai city were selected and data model above was used，automatic generating system of traffic markings was built under ArcGIS platform，and then traffic markings were realized with linear reference technique，property information of traffic markings was also written in GeoDataBase. References | Related Articles | Metrics

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Prediction Method for Expectation Speed of Double-Lane Road TU Shu-rong，ZHANG Ze-liang 2010, 29(2): 257-260.  Abstract ( )   PDF (185KB) ( )   As the upper limit of running speed，expectation speed is the key parameter of the running speed forecasting. In view of current problem that the expectation speed is excessively high in running speed prediction of double － lane road，the relationship between road conditions and drivers’choice of expectation speed are focused; the survey method is used to quantify the effect of road conditions on the expectation speed，which improves the prediction method for expectation speed of double-lane road，and lays a good foundation to test the alignment safety of double － lane road by using driving speed. References | Related Articles | Metrics

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Design of Monitoring System for Vehicles Track on the Expressway Network Based on LBS WANG Hua，YAN Hao，REN Jia，BAO Qiang 2010, 29(2): 261-264.  Abstract ( )   PDF (345KB) ( )   The solution to monitoring vehicles track on the expressway based on LBS (Location Based Service) was proposed， concerning the current problems existing in the expressway toll network such as path ambiguity，charges theft and evasion，emergency rescue. The system architecture and system work flow chat were designed. The system characteristics and key technologies were analysed. ，The results prove that the system designed can achieve the monitoring function very well after testing. References | Related Articles | Metrics

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Algorithm for Shortest Path of Intercity Public Transportation System HUANG Yuan-chun ，XU Yao-fang，PAN Hai-ze 2010, 29(2): 265-268.  Abstract ( )   PDF (153KB) ( )   The algorithm for the Shortest Path was proposed based on characteristics of Intercity Public Transportation System. The main aim is at the selection of transfer paths. The least transfer and lowest generalized expense of time and price were solved. This paper firstly presents a way which based on the Floyd algorithm to obtain the least transfer matrix and multiple shortest path，then it calculates the generalized expense of all the least transfer paths by station － line search method. References | Related Articles | Metrics

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Method of Intersection Agent Coordination Based on Game-learning XIA Xin-hai，XU Lun-hui 2010, 29(2): 269-271.  Abstract ( )   PDF (138KB) ( )   Coordination based on Muli-agent constitutes a focus of open，distributed，complicated systems. In this paper， this technique was applied to urban intersection traffic coordination control. The coordination mechanism of traffic signal control Agent was analyzed. The abstract dynamic model of coordinated distribution of resources about interactive intersections was put forward used traffic signal control Agent as a role. The method of Game Theory was applied to realize the coordination ，and the renewed Q-value in the distributed reinforcement Q-learning was used to build the payoff values in the method of game theory. By comparing the method with and without coordination by an experiment of two intersections ，the result indicates that the coordination method based on Game-learning is effective References | Related Articles | Metrics

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Mathematical Model about Road Capacity and Analysis for Influence of Automobile Performance ZHOU Jun，GAN Shou-wu，XU Jin，CHEN Zhi-jun 2010, 29(2): 272-275.  Abstract ( )   PDF (135KB) ( )   The mathematical model about the road capacity was built based on the driving behavior mode of the conservative pattern，moderate pattern and venturesome pattern. According to the acquired mathematical formulas，the influence of automobile dynamics performance and handling stability on road capacity was analyzed. That is reliable mechanism design and extensive application of advanced technologies，just like ABS and automatic transmission，which are beneficial to minish distance headway and improve road capacity. Saturated traffic capacity of departing from intersection will also have an increment with the improvement of automobiles’acceleration. The realization of Cruise Control System and Formation of Navigation in future may cause an essential augment of traffic capacity. The increment of road capacity will become an inevitable trend. References | Related Articles | Metrics

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Traffic Data Collecting and Processing Technology Based on CDMA QIN An，LI Shu-qing，NIE Shi-gang 2010, 29(2): 276-279.  Abstract ( )   PDF (218KB) ( )   Traffic data collecting and processing are the basis of intelligent transportation technology. Through analyzing types of traffic data collecting techniques，a new measure based on CDMA is presented. The Structure of traffic data collection system is also given. The procedure of data processing combined with the characteristics of the traffic in urban road is described. The traffic road condition is displayed real-time on GIS map. Finally，a case study in the city of Chongqing is shown. References | Related Articles | Metrics

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Investigation on Residents’Trip by Using SMS of Mobile Phone HUANG Mei-ling，LU Bai-chuan 2010, 29(2): 280-284.  Abstract ( )   PDF (610KB) ( )   The new method by using SMS of Mobile Phone for investigating the residents＇ trip is introduced. Firstly，the function and interface of collecting the trip data were designed. The software of collecting data was explored based on J2ME platform. The collected trip data are all transmitted to a database in a pointed sever. The results were proved to be more informative and the method is more practical than other traditional measures. References | Related Articles | Metrics

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Evaluation and Research of BRT Service Level LI Ying-hong，SUN Hui-juan 2010, 29(2): 285-290.  Abstract ( )   PDF (211KB) ( )   Bus Rapid Transit，as a new type of bus transit mode，has been adopted as the effective way to solve city traffic problems because of its lower investment，shorter construction period，and easier to take effect. The test report of bus rapid transit service does help to find the weak condition in the run of bus rapid transit，also is good for adjusting the overall design of bus rapid transit lines，the comprehensive balance of service ability and volume，the market development，and attracting passengers，to keep the further development of bus rapid transit. The estimate of bus transit service is important to realize，construct，develop city bus transit industry，also is significant for us to make bus transit more perfect. Based on the common bus traffic evaluation system，the author sets up the service index system of BRT. The thesis attempts to use Gray Clustering Analysis to evaluate the service level of BRT roundly and objectively，reflects service quality of BRT. The thesis has made more statements and improvement of the bus transit conditions. According to the local running conditions and the deficiency of bus rapid transit，the author makes more valuable measures to develop the whole service level of the BRT. References | Related Articles | Metrics

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Analysis on Economic Loss of Soil and Water Eroded during Highway Construction in Mountain Area ZHANG Zhuo 2010, 29(2): 291-293.  Abstract ( )   PDF (105KB) ( )   Economic loss of soil and water loss in highway has negative benefit by man － made accelerated erosion in zonal region. Making a comprehensive survey on outer round of Chongqing，the eroded units and the environmental sensitive area along the line are discussed. The paper choices the evaluation index of soil and water loss. The relation of the evaluation index and economic loss is set up. The result provides a quantificational reference to soil eroded treat and protection of highway construction in mountain. References | Related Articles | Metrics

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Integrated Evaluation on Adaptabilities of HighwayTransport and Rural Urbanization GUO Chun-ling，ZHUANG Yu，ZHANG Ya-jie 2010, 29(2): 294-298.  Abstract ( )   PDF (133KB) ( )   Based on the classification of rural urbanization，the index systems for evaluating the development of highway and rural urbanization have been put forward. The methods for adaptability evaluation were established and the adaptablility index were used to evaluate their adaptabilities of Highway transportation and rural urbanization respectively. These methods were experimentally tested on two cities of Xi’an and Hanzhong in 2006. Conclusions suggests these methods are practically and reliably good，and the evaluation index is reasonably selected. Some proposals for improvement and measures were presented based on the evaluation results in order to provide the theoretical basis for enforcing the highway transportation and coordinating region society development thus to realize the sustainable development. References | Related Articles | Metrics

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Numerical Simulation of Two-dimension Waterflow Condition on Navigation in Chonggang Mineral Terminal FANG Chun-yan，YANG Bin1，ZHU Xu，KONG De-hua 2010, 29(2): 299-302.  Abstract ( )   PDF (222KB) ( )   This paper analyzed the waterflow condition on navigation of Chongqing Mineral Terminal Project by using orthogonal body-fitted coordinate and two-dimension shallow water mathematical model. Verification calculations were performed about the observed surface-line and velocity distributes of the river reaches of Huachaomen and Tangjiatuo. The result shows that it can accurately simulate the complicated boundary waterflow condition to predict the velocity field of project reaches. Therefore，the result corresponds with the practical measures and is reliable to meet the navigable demands of project. References | Related Articles | Metrics

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Analysis on ST OFFSHORE Anchor 3D Modeling ＆ FEA LEI Lin，WANG Zhi-xiang，ZHANG Min，ZHANG Guo-peng 2010, 29(2): 303-306.  Abstract ( )   PDF (440KB) ( )   The ST/STS OFFSHORE ANCHOR series is a new type steel plate welding anchor with large holding，according to the requirements of CCS，the finite element analysis of structural strength for the anchor must be done. 3D modeling and FEA software(ABAQUS) are used in this paper to analyze the structural strength of the 15000Kg ST OFFSHORE ANCHOR. The results show that the structural strength satisfies the large holding load requirement of the Classification Society. References | Related Articles | Metrics

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Characteristics of Nitrogen Element in the Soil at Purple Lands XIAO Fei 2010, 29(2): 307-310.  Abstract ( )   PDF (317KB) ( )   The study，based on the different slope position ( top，middle，bottom) and land use ( farmland，woodland， garden land and abandoned grassland)，analyzed the total nitrogen and available nitrogen in the soil. The results showed: ( i)the nitrogen content is influenced by the slope position，generally，the content of total nitrogen and available nitrogen is the highest in the bottom of slope，and the lowest content occurred in the middle of slope; (ii)the content of nitrogen is influenced by the land use，usually the content of total and available nitrogen in the woodland is the highest，and that in the farmland is the lowest;(iii)the ratio between carbon and total nitrogen is concentrated on 7. 3 ～ 13. 9 under different land use; (iv)the content of total nitrogen is correlated significantly with the bulk density，clay content，available nitrogen，total potassium and available potassium. References | Related Articles | Metrics

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Experiment Researches for 16Mn Steel under Proportional and Non-proportional Stressing XIANG Yang-kai，ZHENG Yi，ZHOU Zhi-xiang，LI Shu-fang 2010, 29(2): 311-314.  Abstract ( )   PDF (290KB) ( )   The experiments for 16Mn steel under uniaxial and multiaxial cyclic stressing were performed by using MTS809 testing system and teststar control system，the influences of stress amplitude and its history on ratcheting were investigated. The larger the stress amplitude，the larger the ratcheting strain，and the ratcheting strain stablized gradually. Meanwhile， the stress history of previous larger amplitude made the subsequent ratcheting shakedown. References | Related Articles | Metrics

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Study on LSQR Inversion of Tomography Method Based on Shortest Traveltime Ray Tracing ZHAO Huo-yan，ZHAO Ming-jie，HUANG Wei-dong，LI Jian，LI Yong 2010, 29(2): 315-318.  Abstract ( )   PDF (512KB) ( )   The concrete implement process of tomography，which based on shortest traveltime ray tracing technique and LSQR iterative method，was given. Assumed physical models with abnormal velocity areas were upbulit. Result from difference analysis of inversion indicated that: (i) relative difference of abnormal velocity areas is higher than average relative difference，velocity of nodes always leaned to background velocity; ( ii) average relative difference is 2. 34% ～ 2. 59%， and correlation coefficient is 0. 84 ～ 0. 85. ( iii) result of tomography can well reflect the models. ( iv) asymmetry and shortage of radial may induce image distortion and should be meliorated by ameliorating radial disposal. References | Related Articles | Metrics

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Test Suite Reduction Methods Based on Process Slicing WU Jie，DING Xiao-ming 2010, 29(2): 319-320.  Abstract ( )   PDF (120KB) ( )   Deleting the redundancy test suite always causes the descending of FDE( full name Fault Dectection Effectiveness). This problem can be solved by using process slicing. We firstly defined the sentences which may easily cause the process errors as key points，then sliced the process and analyzed the scale range. We argue that FDE for minimalizing test suite can be guaranteed by using the scale range to test suite reduction with selective redundancy. References | Related Articles | Metrics

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Periodic Solutions of Cellular Neural Networks with Impulses and Delays LI Zhong-hua，WANG Hui 2010, 29(2): 321-325.  Abstract ( )   PDF (287KB) ( )   A celluar neural network(CNN) with impulses and time － delay is studied. With less conservative，some new sufficient conditions for the existence and global exponential stability of periodic solution are established. It is believed that these results are significant and useful for the design and applications of CNN-type biological and artificial neural networks. References | Related Articles | Metrics

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Coupled Fixed Point Theorem for Mean Set-Valued Non-expansive Mappings LIAO Zheng-qi 2010, 29(2): 326-328.  Abstract ( )   PDF (142KB) ( )   By using point valued method for set-valued mappings in strict convex Banach space，we have proved existence and uniqueness of coupled fixed point for mean set-valued non-expansive mappings，and obtained convergence of Mann iterative sequence. References | Related Articles | Metrics