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20 February 2001, Volume 20 Issue 1 Previous Issue    Next Issue

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Failure process analysis of cement concrete pavement based on fracture mechanics and a new idea of pavement design YI Zhi jian,WU Guo xiong,ZHOU Zhi xiang,YANG Qing guo,ZHOU Shui xin,WU Zu lie 2001, 20(1): 1-5.  Abstract ( )   PDF (165KB) ( )   By taking the hardening process of concrete surface course into consideration,this paper applies for the first time the fracture mechanics to analyses of the failure process of the contact interface between the cement concrete pavement and the base.The analysis reveals that the surface course and the base course are not contacted smoothly as idealized by the pavement theoretical model,instead,there exists a transition layer between the surface course and the base course.Failure of the transition layer contributes to the grave deterioration of the actual pavement concrete slab on the bottom face and gives rise to the formation of a wealth of surface cracks there,resulting in the actual strength of the concrete slab far below the design strength.Bearing this understanding in mind,the present paper proposes a new idea of pavement design and corresponding method of construction. Related Articles | Metrics

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Dynamic response of simply curved-girder under moving load series SHAN De shan,LI Qiao 2001, 20(1): 6-9.  Abstract ( )   PDF (171KB) ( )   under moving load series,and gets the closed form soulions to the dynamic response.A standard load series model was defined to represent single axis,double axes and fouraxes load series models.With the standard load model,dynamical responses of simply supported curved beam were determined.Since no self defined functions were utilized,the deduction process is unequivocal and results in a reliable result.According to these we have completed the program which can calculate the dynamic response of curved beam under moving loads.? Related Articles | Metrics

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Research of rigid cable suspension bridge LI Ying,LIN Chang chuan 2001, 20(1): 10-14.  Abstract ( )   PDF (160KB) ( )   Rigid cable suspension bridge,whose main cable and hanger are rigid,can solve some problems of normal suspension bridge such as fatigue of hanger and lower rigidity of the structure.The analysis,design and construction of rigid cable suspension bridge are discussed in this paper,and a practice of this type of bridge—The Guanghua Bridge in Changzhou,Jiangsu province are given in the paper. Related Articles | Metrics

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The analysis of shakedown for a continuous beam with uniformly distributed load subject to alternating ZHENG Min xun 2001, 20(1): 15-18.  Abstract ( )   PDF (134KB) ( )   The shakedown of the continuous beam with unifromly distributed load subject to alternating is analyzed in detail and maximum loads of the shakedown have been determined.It is 0 46 times more than elastic maximum load.It makes a point that the analysis is applicable to continuous beam with many supports. Related Articles | Metrics

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The application and research of unbonded vertical prestress in long span continuous beam bridge HE Yu wei , CHEN Guang xing , LIU Zhong 2001, 20(1): 19-21.  Abstract ( )   PDF (131KB) ( )   Through the practice of vertical pressers in long span continuous box girder and the research of two way prestress model test,the construction technology about unbonded vertical prestress is proposed and applied in Hanjiang Bridge in Hanchuan.For the first time,It’s first adopted in long span concrete bridge in our country and a lot of economic benefits are created because of its advantages such as little drill way,rapid and imple construction,high quality and so on. Related Articles | Metrics

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Study on pavement performance of PE complex modified asphalt HAO Pei wen , YANG Mei rong , YOU Rong wei , SHUN Peng lin 2001, 20(1): 22-25.  Abstract ( )   PDF (129KB) ( )   The paper studied the pavement performance of PE and waste rubber power modified asphalt with Liao He A 100,and the results show that it can improve high temperature susceptibility and anti aging performance when LiaoHe Asphalt is modified with PE and rubber power;The rutting resistance at high temperature,water resistance and fatigue resistance of waste PE and rubber power modified asphalt mixtures have been improved,as anti cracking performance at low temperature of which has some improvement Related Articles | Metrics

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Analysis of dynamic load caused by driving automobile on undulate pavement XU Jian ping , SHANG Gang , LIANG Nai xing 2001, 20(1): 26-28.  Abstract ( )   PDF (111KB) ( )   In this paper,dynamic loads caused by driving on undulate pavement are analyzed and a theoretical relation between dynamic loads of automobile and undulate pavement is developed.At given automobile mechanism parameter、moving velocity and undulate pavement parameter dynamic loads of automobile are analyzed through an example. Related Articles | Metrics

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The technical study on modified asphalt concrete pavement in Guang-Fo Expressway LI Yang biao 2001, 20(1): 29-33.  Abstract ( )   PDF (151KB) ( )   Modified asphalt concrete pavements in Guang Fo Expressway is formed by changing the property of bitumen mixture asphalt.It is anti crack in low temperature and stable in high temperature.It can bear auto load of heavy traffic,reduce rut and noise,and it prolongs the life of the highway.So this technique is worthy of being spread and applied. Related Articles | Metrics

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Completed pile working method of bore hole filling pile in the rock area with under-earth mined out layer SUN Guo hua 2001, 20(1): 34-36.  Abstract ( )   PDF (141KB) ( )   The paper is based on the working particle for several bridges in the construction of W8 section of Sheng yan Railway project.It systematicaly instructs the construction method of bore hole filling pile in the rock area with under earth mined out layer. Related Articles | Metrics

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Vehicle noise calculating formula inference at a roundabout WANG Bo,WANG Wei 2001, 20(1): 37-41.  Abstract ( )   PDF (165KB) ( )   In this paper vehicle operating characteristics at a roundabout are discussed,and the vehicle noise composition is analysed.Then the calculating formula of vehicle noise at a roundabout is deduced,which is based on the vehicle noise experimental model at the road sections. Related Articles | Metrics

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The operation characteristics models of transit SU Yong yun , YAN Ke fei , HAN Hao 2001, 20(1): 42-46.  Abstract ( )   PDF (163KB) ( )   This paper clarifies the structure of the transit system models,sets up the characteristic models of the traffic flow which consist of bus flow with bus rider,then expounds the compute method of running time using the analytic method and simulation technology,and presents a case analysis. Related Articles | Metrics

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A study on headway distribution WANG Yuan qing , LI Ji rui , ZHOU Wei 2001, 20(1): 47-49.  Abstract ( )   PDF (127KB) ( )   Based on the analysis of traffic phenomena,this paper sets up the distribtuion model of headway Gamma distribution function and makes parameter estimation by using Moments methods.Then it discusses the model in several special cases.Finally the validity of the model is certified by imitation of the information of headway in the road.It supplies feasible foundation to highway capacity. Related Articles | Metrics

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Paying attention to a problem about sustainable development and changes of transportation structure HONG Wei, QIAO Le zhong, ZHANG Yun 2001, 20(1): 50-54.  Abstract ( )   PDF (151KB) ( )   This paper puts forward a point of view that the changes of trasportation stucture bring about the predicament of sustainable development dealing with the analysis to Chongqing City’s statistical datea by 1978-1998,and gives a possible interpretation according to institation change theory. Related Articles | Metrics

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Integrated equilibrium assignment model in urban traffic network and algorithm LI Zhi chun , ZHONG Chun ping 2001, 20(1): 55-57.  Abstract ( )   PDF (106KB) ( )   On the basis of UE and SO, integrated Equilibrium Assignment model is proposed. The intention is to harmonize the contradiction between them and makes the traffic programme rationalize more and more. It views both of user and system. Meantime, the model is solved by improved GA and the results show the algorithm is practicable and effective. Related Articles | Metrics

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Discussion on the sight coordination of expressway ZHANG Tao , CHEN Hong kai 2001, 20(1): 58-61.  Abstract ( )   PDF (127KB) ( )   Based on synergy,the authors discuss the sight coordination of expressway(SCE) in this paper in detail,which includes composing of SCE,net features and synergetic features among sub system in the SCE.Studies in the paper are valuable in highway aesthetics science. Related Articles | Metrics

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Investigation for digitizing data processing of highway strip relief map CHU Dong 2001, 20(1): 62-64.  Abstract ( )   PDF (97KB) ( )   This paper investigates for digitizing data progressing of beeline and rightangle type surface features and discusses the quality standard of the assessment. Related Articles | Metrics

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Analysis on the strength property of reinforced earth retaining structure(wall)in the V-shaped gully LEI Sheng you 2001, 20(1): 65-68.  Abstract ( )   PDF (175KB) ( )   The reinforcement is R C Series connection slab in constructing reinforced earth retaining structure which is situated in the V shaped gully.The author analyzed the strength property of this structure in the method of simultaneously increasing the value of C and φ,and gained the formula of the bearing capacity of the surface of backfill behind wall under two different kinds of destruction conditions.It has been proved that this structure be good through engineering practice,and its use should be widened Related Articles | Metrics

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Developing tendency analysis of slope deformation composed of loose rock in the course of harnessing of landslide ——Taking the XinShaofang landslide in the Highway from Xichang to Muli as Example WENG Qi neng, TANG Hong mei, CHEN Hong kai, WANG Kai 2001, 20(1): 69-73.  Abstract ( )   PDF (204KB) ( )   Landslide is a kind of universal and serious geological disaster, which usually has characters suchas high happening frequency、high destroy force and many kinds of destroy performs. In modern highway engineering,because highway is wider and has the higher amount of transport,it has higher demand for the stability of highways slopes.In the paper,taking the XinShaofang landslide in the Highway from Xichang to Muli as example, applying mathematical method of calculation and analysis, the author analyse the developing tendency of the rock and land mass deformation in the course of harnessing landslide. This method is feasible and the analyzing result is prototype to some extend, which have value to analyze the slopes stability and harnessing landslide.? Related Articles | Metrics

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Research on source of loose earth for lmpact-deposit debris flow to develop in view of geotechnical stability of debris flow catchment——Taking pingchuan debris flow as an example situating in xichang-muli road TANG Hong mei,CHEN Hong kai,WENG Qi neng,WANG Kai 2001, 20(1): 74-78.  Abstract ( )   PDF (196KB) ( )   The authors discuss roundly source of loose earth for impact deposit debris flow to develop taking pingchuan debris flow,one of the quite typical impact deposit debris flows in southwest sichuan province,as an example in this paper. on the basis of detailed investigations in situ,geotechnial testing in Lab and theory analysis,all results indicate obviously that moderate and bulky loose earth in giant debris flow situating in southwest sichuan mountainous area are main institute,whose tribulation are consistent with landforms.Loose earth locating in mid forepart catchment are quite unstable,so often becomes main source of loose earth of debris flow.Formation of loose earth is controlled principally by geologic and geotechnical environment while human actions is the secondary factor for loose earth to form.In many times,human actions provide loose earth through loose earth stability. Related Articles | Metrics

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Stability-analysis of elastic pile XIA Gui yun 2001, 20(1): 79-82.  Abstract ( )   PDF (159KB) ( )   This paper presents the general formula of stability analysis,with,Rayleigh Ritz method and finite element method,based on the minimum potential energy principle.The two methods are checked and compared through examples. Related Articles | Metrics

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The study on the improvement of the weave quality of highway engineering budget estimate and budget LI Yang baio 2001, 20(1): 83-85.  Abstract ( )   PDF (98KB) ( )   Highway engineering budget estimate is one of the important parts of the preliminary sketch documents.Highway engineering budget is one of the important parts of constructional drawing documents.So they are essential to the constructional items of the highway engineering.To improve the weave quality of the budget estimate and budget need efforts of 5 aspects: 1 To select the unit cost of materials; 2 To check engineering quality and express it according to the weave budget estimate and budget; 3 To have the construction plan after optimizing; 4 To select accurately quota and make up for the quota of the abstract items. 5 To analyze the engineering cost according to the complete budget estimate and budget. In practice,we should pay much attention to accumulating rare datum and improve the weave level of budget estimate and budget.? Related Articles | Metrics

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Resource-optimizing and cost-analysing of “digging-carrying” system JIA Lian sheng,WANG Heng bin 2001, 20(1): 86-90.  Abstract ( )   PDF (163KB) ( )   This paper discusses the relation of charge level,member amount and construciton cost of the “digging carrying” system which is made up of grabs and automobiles by applying the theory of stochastic service. Related Articles | Metrics

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Vehicle maintenance and the solution of vehicle exhaust pollution SHAO Yi quan , DU Si wu , SHAO Yi ming , LIANG Xiong yao 2001, 20(1): 91-94.  Abstract ( )   PDF (155KB) ( )   This article presents a study of the following three questions:whether the exhaust of vehicles in use has met the set standard;whether the exhaust of vehicles maintained by class two and above enterprises can meet the standard and whether the exhaust of vehicles in different technical situations can meet the standard after they have been maintained by those enterprises.Meanwhile this article points out that it is not right to depend mainly on purifying equipment to deal with the exhaust pollution,and that it is efficient to control the exhaust pollution in cities by raising and reinforcing the supervision of maintenance quality. Related Articles | Metrics

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Characteristics of flowing noises in the filling culvert of the Lingjintan ship lock SUN Xiao peng , FENG Bo lin ,ZHANG Jun 2001, 20(1): 95-99.  Abstract ( )   PDF (251KB) ( )   The Lingjintan ship lock is a single lift and moderate head ship lock with conveyance system of short culvert. Under normal operating conditions of the ship lock, the noise characteristics of each position in filling culvert are analyzed by the observation data in the prototype. It pointed out that under normal operating conditions of ship lock the noises in filling culvert are considered to be low frequency noises of non cavitation flow basically and in the noises there are not the high frequency components with higher energy accompanying strong cavitation.? Related Articles | Metrics

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Investigation of the definition construction water level about river harbor dock ZHANG Zhi hong , XU Ke jian 2001, 20(1): 100-105.  Abstract ( )   PDF (174KB) ( )   The concept and influencial factors of the port waterfront structures construction water level are discussed in the pater,and importance of the reasonable decision of the construction water level is shown for the port terminal,and the experience of the construction water level designed is summed up for the river harbor dock on all types of river reach in China,and the selective extent is advanced to the construction water level to refer for the designer. Related Articles | Metrics

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The study of ladder shaped culvert best engineering and hydraulic’s section SHEN Bo 2001, 20(1): 106-109.  Abstract ( )   PDF (137KB) ( )   This paper has proved that the ration formula of width to depth β=b/h=2m\+2+1-m is the best ladder shaped culvert section from many ways,which has a significance to realizing and applying the best engineering and hydraulic ladder shaped culvert section. Related Articles | Metrics

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Study on improvement measures against lip cavitation of lock filling and emptying valves LIU Ping chang , WANG Zhao bing , XIANG Wen ying 2001, 20(1): 110-113.  Abstract ( )   PDF (150KB) ( )   This paper studies measures for depressing valve lip cavitation,Compares virtue and short coming of Version improvement measures,based on increasing Working Cavitation number. Related Articles | Metrics

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Generalizations of abstractly generalized bi-quasi-variational inequalities WANG Da cheng 2001, 20(1): 114-117.  Abstract ( )   PDF (129KB) ( )   ly generalized bi quasi variational inequalities introduced in [1] and [2] are studied.The results presented in this paper unify,improve and develop many recent results. Related Articles | Metrics