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21 April 1997, Volume 16 Issue 2 Previous Issue    Next Issue

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Research on Modelling of Spindle System of Horizontal Boring Machine Han Xi, Zhong Li, Liao Boyu 1997, 16(2): 2-8.  Abstract ( )   PDF (215KB) ( )   This paper applies finite element and dynamic substructure to establish the model of a spindle sy stem of horizontal boring machine (TX619B), and simulates the model on computer.As the result shows, the model has a high simulant accuracy for real machine structure which will be a g ood base for the optimum design in the future. Related Articles | Metrics

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Research of Systematic Engineering Idea on Water-reduced Hazard of Road Chen Hongkai, Zhu Jianglin, Zhang Yongxing 1997, 16(2): 9-12.  Abstract ( )   PDF (122KB) ( )   Water-reduced hazard of road is a general name for catastrophic phenomena and catastrophic processes in the course of construction and management of highway engineering.This paper is based on years of research on water-reduced hazard of road.Systematic engineering idea is pointed out first in the paper, then the multidimension structure of water-reduced hazard of road is given and analy sed. Related Articles | Metrics

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Some Simplified Calculation Methods and the Comparison for Determining Neutral Axis of Partially Pretressed Concrete Beams and Compression Members with Small Eccentricity Yang Limei 1997, 16(2): 13-20.  Abstract ( )   PDF (229KB) ( )   According to Standard (JTJ023-85)of road、bridge and culvert, the beams of the kind of B of partially pretressed concrete and the compression members with small eccentricity, this paper gives the general equations of calculating the value of ξ of a relative height in the com pression reign of the section.And it gives different formulas of the coefficient of these equations.This paper also offers three kinds of simplified approaches by which a cubic equation approximated by aquadratic equqation with acceptable accuracy is proposed.Through examples these simplified methods are analysed and compared. Related Articles | Metrics

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Reliability Analysis Procedures for the Method of Flexible Pavements Design with Deflection Criteria Huang Wei, Zhao Yanqing, Qin Fusheng 1997, 16(2): 21-26.  Abstract ( )   PDF (221KB) ( )   A reliability analysis procedure is developed for the flexible pavements design method based on deflection criteria.The relationships among pavement structure, fatigue life span and reliability are presented by Monte Carlo simulation method.The results indicate that the variation of fatigue life span mainly depends on the variations of thickness and modulus.The expected value of thickness and modulus have little effect on the variation of fatigue life span.For deflection criteria, the fatigue life span of flexible pavement is sensitive, in the descendiny order, to variation of P, E3, h2, E2, h1, E1. Related Articles | Metrics

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Computing Deformation and Stress of Flexible Pavement by Non-linear FEM Zeng Derong, Ling Tianqing, Wang Shijie 1997, 16(2): 27-36.  Abstract ( )   PDF (274KB) ( )   In this paper, computing deformation and stress of flexble pavement are analysed by non-linear FEM and nonlinear material constitution model of stone and soil is used, and non-ex tension of them is introduced.The computing program is designed and program med, which computes pavement structures of many different constitution models.A few exam ples are given, and the results show that this method is correct. Related Articles | Metrics

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A New Method to Compute Fatigue-thermal Stress of Concrete Pavement Gu Wenjun, Yu Jianrong 1997, 16(2): 37-42.  Abstract ( )   PDF (181KB) ( )   Both the load stress and thermal stress contribute to fatigue damage in concrete pavements. In this paper, using the equivalent fatigue damage principle, a simple but rational method to compute fatigue-therm al stress of concrete pavement is developed, which improves the method of reference[3] presented. This new method agrees to the fact that thermal stress affected on pavement and provides a theoretical base for pavement design considering the comprehensive influence of therm al stress and load stress. Related Articles | Metrics

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Study of Mechanical Properties of P.R.C Box GirderUsing in Bridge Transporter Wang Duoyin, Chen Jiaqin 1997, 16(2): 43-47,60.  Abstract ( )   PDF (188KB) ( )   In this paper, based on the model testing of P.R.C box girder, The feasibility of the structure using in bridge transporter in port is verified.It also searches for the theo retical basis of calculating of the structure.The purpose is searching for a calculating method of the structure and trying to make the structure reasonabaly used in greatly various of water levels in port construction. Related Articles | Metrics

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Study on the Cement (Lime) Pfa Mixture Base Course Yang Xiwu, Ling Tianqing, Liang Fuquan 1997, 16(2): 48-52.  Abstract ( )   PDF (153KB) ( )   This paper conducts an investigation on the properties of cement (lime)pfa mixture base course, including its strength of compression. bending, cleavage, fatigue and modulus of compression, bending and cleavage.The cement (lime) pfa mixture base course has been built on express way between Chengdu and Chongqing, and the test information on the experimental road is given in the paper. Related Articles | Metrics

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The Mechanical Slipform Construction of Cement Concrete Pavement Hu Junxiong, Liu Tao, Dan Shuying 1997, 16(2): 53-58.  Abstract ( )   PDF (196KB) ( )   This article conbines the construction practice of main line surface course in contracts No.2 &3 of ShenShan Expressway, gives a brief introduetion on the selecting & balancing of equipments, the construction process and the relevant experience for the mechanical slipform construction. Related Articles | Metrics

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Discussion on Surveillance and Control Strategy of Freeway Traffic Management System Shao Honghui, Shi Daqing 1997, 16(2): 59-64.  Abstract ( )   PDF (173KB) ( )   Freeway Traffic Management System is very important to make the best use of the freeway's capacity.This article focuses on system benefits, management concepts and strategy, application of the strategy in China.Also some tentative ideas are discussed. Related Articles | Metrics

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The Synthetic Analysis Model of Big Cities' Passenger Traffic Mode and Its Application Li Bin, He Ning, Wei Chang 1997, 16(2): 65-70.  Abstract ( )   PDF (175KB) ( )   According to the principles of systemic analysis, the AHP model of big cities' passenger traffic mode is established using the Analytic Hierarchy Process (AHP).Applied FISHER comprehensive evaluation method, we put forward a new synthetical evaluation method which is fit to choose the passenger traffic mode of the big cities in our country. Related Articles | Metrics

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Amendment of Speed-Change Lane Length on Slopeway Yang Shaowei 1997, 16(2): 71-74,79.  Abstract ( )   PDF (153KB) ( )   Based on the motor vehicle travel behaviour, this paper discusses the speed-change lane length under influence of road grade.The calculation methods and formulas of acceleration or deceleration are given on level grade, and the calculation formulas of speed-change lane length amendment coefficient are also presented on slopeway.Moreover, typical motor vehicle in China is examplified and the results can be used for design references. Related Articles | Metrics

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Effects of Hydrostatic Pressures on the Natural Frequencies of Cylindrical Liquid Storage Containers Wang Yong, Lan Bo 1997, 16(2): 75-79.  Abstract ( )   PDF (186KB) ( )   In this paer, effects of hy drostatic pressures on the natural frequencies of cylindrical liquid storage containers are analyzed by using nonlinear strain-displacement equation of the shell, and the system matrix equation of motion is derived with an additive stiffness matrix due to the presence of the initial stress field.A comparison betw een the computed dynamic characteristics and the results from experiments is made, showing that they are in good agreement. Related Articles | Metrics

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The Research of Improvement on Navigation Conditions for Braided River Deng Boqiang 1997, 16(2): 80-82.  Abstract ( )   PDF (98KB) ( )   In this paper we research the fluvial river with braided reaches which often appear in the middle and lower part of river.The situation is complicated because of the motion of water and sediment in braided river.The river with wany shoals and rapids is dangerons for the navigation. As to the braided reaches in the natural conditions, they can be used for navigation, if the depth of waterway is enough.The water resources are to be used for navigation. Some work is to be done for the braided reaches and the methods to control dicharges are to be studied so that the river traffic conditions will be smoothly improved. Related Articles | Metrics

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The Research on Valves Cavitation of High-head Lock Luo Jialing, Zhou Huaxing 1997, 16(2): 83-90.  Abstract ( )   PDF (244KB) ( )   As for cavitation of high-head lock calvert valves, this paper briefly discusses how to increase presses on the rear of valves, based on mutiple improment measures from research.For example, modifying culvert valves shape. Related Articles | Metrics

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Application of Submerged Dike in Channel Regulation Zhang Wanfu 1997, 16(2): 91-96.  Abstract ( )   PDF (190KB) ( )   It introduces that the design of dam height using the formula of broad-crest weir discharge is more simple, fast and correct than one using the method of water surface line calculation according to the energy equation.It also introduces that the method of dispersion consuming energy of twin submerged dikes is used to regulate the cell vortex flow and improve the navigation condition on Xiaomi shoal. Related Articles | Metrics

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Soil-erosion with Decreasing Forest Cover Rate about Lancang River Valley Shu Yuqing, Xu Guangxiang, Wang Yunxiang 1997, 16(2): 97-100,132.  Abstract ( )   PDF (164KB) ( )   Based on analyzing data of discharge and sediment in Jinghong Hydrometric Station and forest cover rate of Lancang River valley, this paper finds that discharge is decreasing and sediment load is increasing and soil-erosion becomes more and more serious with the decreasing of forest cover rate because forest has been burning down in the valley since 1970.We think protection of natural environment and forest resources must be especially streng thened while developing economy. Related Articles | Metrics

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Analysis of the Stability of Reinforced Embankments on Soft Ground Xie Kaifu, Yu Yuliang 1997, 16(2): 101-107.  Abstract ( )   PDF (204KB) ( )   A new approach for analysis of the rotation slide stability of reinforced embankments on soft ground is presented in the paper.The approach is based on the circular-arc method but no slices and the tension in reinforcement is obtained.The case showed the approach in this paper is satisfied. Related Articles | Metrics

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The Study on the Passive Earth Pressure's Calculating Method of Clay Soil Gao Jiangping 1997, 16(2): 108-113.  Abstract ( )   PDF (182KB) ( )   According to the analysis of the static equilibrium of finite sliding wedge, the formular of the passive earth pressure about the inclined retaining wall has been given.It can be used not noly for sand but also for clayed soil.It compensates the shortage of the Rankine's earth pressure theory and the Coulomb's earth pressure theory which are both directly used for sand.The formula in this paper can be used for more common cases. Related Articles | Metrics

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A Scieatific Way of Non-rhythm Flow Process Su Yinshen 1997, 16(2): 114-122.  Abstract ( )   PDF (259KB) ( )   This paper mainly discusses the question of how to make the most use of face in non-rhythm flow process.For the first time the six-way resolution is put forth to establish a basic theory for the overall scieatific flow process. Related Articles | Metrics

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Application of Computer in Strain Testing Shi Shangwei, Tuo Yao 1997, 16(2): 123-128.  Abstract ( )   PDF (184KB) ( )   This paper provides the introduction and discussion of the principles and programming design of data logg ing and data automatic processing in strain testing by using com puters.In view of general existing problems in strain testing, several effective and practied methods are also provided.It gives detailed descriptions about the prog ramme functions.The major peculiarities and applied value of the testing software are also introduced. Related Articles | Metrics

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Design of the Disk Oprating System Tools Yi Yangde 1997, 16(2): 129-132.  Abstract ( )   PDF (124KB) ( )   This tool is designed by using BO RLAND c++ 3.x or Turbo c++ 3.1.It can examined and revise the information of the disk, and also, it can copy can renew the partition, can resume data of the disk and protect the file of disk well as single, share and all.This tool counteracts the weknesses of some softw are tools. Related Articles | Metrics