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23 August 1997, Volume 16 Issue 4 Previous Issue    Next Issue

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Paying Attention to Sustainable Development Research in Transportation Economics Hong WeiXiong, Wenqiang 1997, 16(4): 1-6.  Abstract ( )   PDF (169KB) ( )   This paper summarizes the present achievements in transportation economics, and introduces the historical background and recent trends of sustainable development economics, and puts forward a point of view as the transportation evolution increased the environmental cost, ought to development the form of transport coordinated with lebensraum amplifying, the resource-saving type transportation system to be important condition promotion the economic grow th and saving resource and environmental capacity, and so on. Related Articles | Metrics

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Macrofeature Approaches on Rock Mass Slope Unloading in Permanent Shiplock of the Three Gorges Project in Geomorphology Chen Hongkai, Tang Hongmei 1997, 16(4): 7-11,17.  Abstract ( )   PDF (202KB) ( )   On the view point of geomorphology, natural and artificial unloading features of rockm ass slope in the permanent shiplock of the Three Gorges Project are approached in this paper, which shows that geomorphologic processes, e.g.ground erosion, cutting of the Yangtze River and artificial cutting of the shiplock, etc.have been inducing general unloading features of rockmass in the slope.Macrofeatures of rockmass unloading are outlined in geomorphologic method in the paper.As the model is consistent with characteristics insitu and numeric calculation, it is valuable for geomorphologic analysisth be used in general studies on unloading of concrete rockmass engineering. Related Articles | Metrics

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Grouping and Meaning on Water-Conduction Fracture——Discussing the Objectiveness of Rockmass Seepage model in Permanent Shiplock of the Three Gorges Project Chen Hongkai, Tang Hongmei 1997, 16(4): 12-17.  Abstract ( )   PDF (167KB) ( )   The term water-conduction fracture (WCF)is given out based on permeability of rockmass fracture in this paper.WCF, rockmass fracture with characteristics both typical permeable and system atic distribution, is the basis in the course of model which can be made with WCF in concrete geotechnical engineering, which make research results to be more objective, and drainage mechanism and stress-seepage coupling to be possible. Related Articles | Metrics

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Synthetic Analysis of Evolution about Chongqing Reach Xu Guangxing 1997, 16(4): 18-23,31.  Abstract ( )   PDF (253KB) ( )   There are long-term hydrographic data collected in Zhutuo, Beibei and Cuntan, three hydrographic controlling station at Chongqing reach.in Yangtze River.According to data including suspended load and sizes at entrance of reach and exit and bed deposition, channel pattern varying with water period, detailed synthetic analysis about reach evolution has been made in this paper. Total feature of this reach evolution is that bed is deposited in period of floodw ater and eroded in dry season and kept balance of erosion and deposition in a year or many years.It is the same with the results of actual measuring channel cross section. Related Articles | Metrics

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Thermal Stress Analyses of Cement Based Semi-Rigid Surface Course Composite Li Guoqiang, Huang Wei, Deng Xuejun, Wei Lianyu, Jiang Zhiren 1997, 16(4): 24-31.  Abstract ( )   PDF (224KB) ( )   According to the micro-structure of cement based semi-rigid surface course composite (CBSCC), a three-layer built-in thermal stress model is established by putting a spherical coarse aggregate particle covered with rubberized asphalt and hollow spherical cement mortar matrix into equivalent CBSCC media.The calculation results show that, when cooling, coarse aggregate phase and rubberized asphalt phase are in compression, while tangential tensile stress in cement mortar matrix and normal tensile stress in equivalent CBSCC media are developed.The stress values in each phase of CBSCC are at most one-forth as large as those in corresponding phase of controlled cement concrete.When the fraction values of rubberized asphalt are tripled, the interface normal stresses are reduced by twenty percent to three hundred percent;when the elastic modulus of rubberized asphalt is increased by sixty-five hundred percent, the interface normal stresses are increased by tw o hundred percent to twelve hundred percent. Related Articles | Metrics

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Analysis of Overlay on Cracked Plates on Elastic Foundation Qiu Zuozhong 1997, 16(4): 32-36,50.  Abstract ( )   PDF (185KB) ( )   In dealing with the mechanics character of theoverlay on cracked plates on elastic foundation, isoparametric solid finite elements have been used to simulate the plates and overlay, Goodman interface element to simulate interfaces betw een plate and overlay, plates and foundation, also to simulate the cracks in plate.According to this, the stress in overlay with variety conditions have been presented in this paper. Related Articles | Metrics

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Research on Grouting Material for the Crack of Concrete Pavement Chen Zhongda, Zhang Dengliang 1997, 16(4): 37-40.  Abstract ( )   PDF (119KB) ( )   This paper, on the basis of analy sing the study achievements at home and abroad, and grouting material at home, has selected polyurethane as grouting material for the crack of concrete pavement, and analysed that diluent, filling element and solidified state have influence on the binding strength.The experiment results show that the grouting material has binding strength more powerful, of better stability, of shorter solidified time, of simpler construction and cheaper price, and can be especially used in the moist surface. Related Articles | Metrics

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The Relationship between Axle Loads and Pavement Deterioration Ni Fujian, Deng Xuejun 1997, 16(4): 41-50.  Abstract ( )   PDF (271KB) ( )   Some national and foreign research results about axle loads conversion are collected in this paper.According to the equivalence principle of surface deflection, tensile stress at the bottom of base, subgrade vertical strain and rut depth, the axle-load exponents of axle loads conversion formula are calculated respectively.On the basis, suitable exponents are suggested.Finally, using the axle-load distribution, the effect of axle-load exponents on pavement lives is analyzed. Related Articles | Metrics

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Exchanging Relation between Strength and Stiffness Target of a Bridge in Evaluating It's Bearing Capacity Zhou Jianting 1997, 16(4): 51-54.  Abstract ( )   PDF (176KB) ( )   It is important to evaluate bridges' bearing capacity correctly and timely.In this paper, using design principle of steel concrete structure, exchanging relation between strength and stiffness torget of steel concrete T-beam bridges is set up, which is proved to be correct and helpful in practices. Related Articles | Metrics

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The Comparison Study of Crowd Load on Road Bridge Li Hongdi 1997, 16(4): 55-59,64.  Abstract ( )   PDF (183KB) ( )   In this paper, based on comparison study of crowd load in some countrios, we give the reform towards the standard in present.And this paper can be used as a reference on the reform of standard. Related Articles | Metrics

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Interpolation Perturbation Method for Solving the Weakly Non-Linear Vibration Problem Zhang Wei, Yuan Yiwu 1997, 16(4): 60-64.  Abstract ( )   PDF (146KB) ( )   In this paper, using the interpolation perturbation method, the author seeks to soive the initial problems of the weakly non-linear damped vibration.We transform the original differential equation into that of the interpolation function, Thus, we obatain the value of the interpotation function, and it is easy to obtain the original unknown function.There are calculating examples, which show that the results of this paper are quite near to the corresponding results obtained by using the m ultiple scales method[2]. Related Articles | Metrics

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The Direct Calculation Method on Archbridge-building in Sections Chen Zhigang 1997, 16(4): 65-70.  Abstract ( )   PDF (181KB) ( )   This paper introduces the direct calculation method on archbridge-building in sections coordinates and mould board size.It needs no lofting process. Related Articles | Metrics

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A Reliability and Optimization Design for 2K-H Planetary Gear System Yin Li 1997, 16(4): 71-76.  Abstract ( )   PDF (183KB) ( )   This paper deals with the reliability and optimization design on 2K-H planetary gear system for the first time, in order to get the better design method. Related Articles | Metrics

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Study on Early Damage of Clutches CQ663 Articulated Bus Liu Jianxun, Shan Li 1997, 16(4): 77-81,108.  Abstract ( )   PDF (171KB) ( )   This article, accroding to the characteristics of the public traffic industry, raises the reasons that damage the clutch in the early stages.At last, on basis of the current domestic situation where on special clutch designed not only for the bus over 16t, but also for the road conditions and climate traits in the city of Chongqing, this article advances several pieces of advice about the improvement of the clutch in CQ663 articulated bus. Related Articles | Metrics

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Several Common “Diseases” of Engineering Quality and Their Prevention in the Highways Cheng Houchang, Deng Heping 1997, 16(4): 82-86.  Abstract ( )   PDF (155KB) ( )   This article analyzes the reasons for the common "diseases" on which concrete road surfaces are destroyed by means of spliting and peeling and vehicles jump at the ends of bridges from the respects of management, technology and construction, and it advances the measures of engineenig management and techmology for the prevention and cure of the dislases. Related Articles | Metrics

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Discussion on the Contingency Analysis of Supervise Network Zeng Fanxiang, Xu Xi 1997, 16(4): 87-93.  Abstract ( )   PDF (193KB) ( )   This paper puts ways in contingency of supervise network with extending, which comprise statistical hypothesis inspect, model error and steady estimation, steady datum of displacement field with extraction and physics sense of characteristic contingency parameter. Related Articles | Metrics

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The Hydraulic Calculation of the Composite Water Transport of Short Passageway and Gate's Hole Yang Bin, Lai Lihuang 1997, 16(4): 94-102.  Abstract ( )   PDF (248KB) ( )   In this paper, the basic equation of the composite water transport of short passageway and gate's hole is given.By introducing average (flow)cofficient and integ ral transfo rmation, the analy tical solution of the basic equation under different conditions is obtained.And using the separate solution of different form of the basic equation, the rationalization of the analy tical solution is tested and verified. Related Articles | Metrics

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Genetic Analysis and Countermeasure on the Collision Avoidance of Bridge Pier (Abutment) in Curved River Reach Liu Debang 1997, 16(4): 103-108.  Abstract ( )   PDF (183KB) ( )   In this paper, using the Huangshi Changjiang Highway Bridge as an analyzing example, according to the experimental data of physical model, with the help of river facies theory in curved river reach, the causes on the fleet through the bridge colliding bridge pier (abutment) are expounded, and the countermeasures on the collision avoidance are probed. Related Articles | Metrics

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Experimental Study on Water Surface Characteristics at the Junction Lan Bo, Wang Yong 1997, 16(4): 109-114.  Abstract ( )   PDF (187KB) ( )   In this paper, collected information has been analysed.Then, regarded the confluence angle as variable, we summarize them into three models with the angles of 30°、60°、90°.Experimental study has been proformed about the water surface characteristics with fifteen discharge combination, and building dam at the junction has also been tested.Results indicate that the discharge ratio of two tributaries upstream and the confluence angle decide the water pattern characteristics at the junction.When the discharge ratio is given, the main canal discharge is related to the water characteristics directly at the junction.in fact, building dam reduces the angle, and it must change the appearance at the junction. Related Articles | Metrics

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Flow Characteristics and Maximum Scouring Water Depth in River Bend Shen Bo, Ai Cuiling 1997, 16(4): 115-119.  Abstract ( )   PDF (163KB) ( )   This paper has discussed the river bend flow characteristics, the maximum scouring water depth position, and the protection range of river bank.According to the sands equational transpo rtation and collected data, this paper has also built up the formula of maximum scouring water depth in river bend. Related Articles | Metrics

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Subjective Reliabilitty——Another Hypothesis of Reliability Chen Guozhen 1997, 16(4): 120-125.  Abstract ( )   PDF (171KB) ( )   The research produces new concepts of subjective reliability and its comparison.It is concerned with the nature and characteristics of subjective reliability, series-parallel systems individually and their relationships with Fuzzy Set of Type Ⅱ.[1][2][3][4] It lays down a preliminery foundation for subjective reliability. Related Articles | Metrics

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An Inductive Teaching Method with Tables Concerning the Input & Output of FORTRAN Language Chen Zhuang, Huang Zhizhen, Zhou Jianli 1997, 16(4): 126-133.  Abstract ( )   PDF (220KB) ( )   In this paper, the main characteristics of FORTRAN language' input & output part is analyzed, and thereby a new inductive teaching method concerning this content is presented.The basic thought and intension of this method are discussed. Related Articles | Metrics

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Topological-Sorting Approaches to the Sequence of Collegiate Courses Zhou Jianli, Huang Zhizhen 1997, 16(4): 134-139.  Abstract ( )   PDF (178KB) ( )   This article introduces the Topological-sorting method to college courses-arranging practice. The result indicates that this method can simplify the college courses-arranging and make the course-order better. Related Articles | Metrics