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RailwayLocationAutomatedOptimizationCADSystem

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Journal of Modern Transportation 1996年第1期13卷 32-43页

作者： Yi Sirong Department of Railway and Road Engineering, Southwest Jiaotong University, chengdu 610031, China

By combining interactive graphic CAD and optimizing methods we have developed an automated optimum CAD system for railway location AORLCAD. Using the AORLCAD, the optimization of both horizontal and vertical alignment of railway can be realized by using automated optimization interactive graphic design alternatively. The result makes automated optimum technique for railway location more completed. The methods of interactive graphic design and optimum techniques used by AORLCAD are introduced in detail.

关键词： railway location optimization CAD

An Analytic Model of Industrial Structure

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Journal of Modern Transportation 1994年第1期11卷 15-21页

作者： Guo Yaohuang Qin LanwenSchool of Economic Management Aouthuoest Jiaotong Unitersity,chengdu 610031 ,China

Taking Deyang as an example of middle and small city, this paper analysesmain factors related to industry development, constructs an appropriateAnalytic Hierarchy Process (AHP) model, and finally obtains the priordeve... 详细信息

关键词： industrial structure AHP model prior development sequence

Studies on Three-electrode Semiconductor Lasers

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Semiconductor Photonics and Technology 1998年第2期4卷 74-77,98页

作者： SUN Hong-xia LU Hongchang (Southwest Jiaotong University, chengdu 610031, CHN)

Using the ray trace method, three-section semiconductor lasers are studied. An analytic expression of output power for the three-section semiconductor lasers is derived for the first time. From this expression, thresh... 详细信息

关键词： Optical Output Power Ray Method Semiconductor Laser

An　Improved　Method　for　the　Solution　of　Linear　Viscoelastic　Problems　with　FEM

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Journal of Modern Transportation 1996年第2期13卷 54-60页

作者： Mao Jianqiang Department of underground and geotechnical engineering,Southwest Jiaotong University,chengdu 610031,China Department of under ground and geotechnical engineering Southwest Jiaotong University Chengdu 610031 China

For various viscoelastic models which are composed of springs and dashpots,their creep/relaxation functions usually are the sum of a series of exponential... 详细信息

For various viscoelastic models which are composed of springs and dashpots,their creep/relaxation functions usually are the sum of a series of exponential *** virtue of this characteristic,the recursion formulae to calculate viscous strain/stress increments during a time step can be ***,the corresponding FEM formulae are also given.A simple example in the end of this paper demonstrates that the precision of computational results is much improved with the method.

关键词： viscoelastic finite element method

DEVELOPING TREND ANALYSIS AND FORECAST OF DEBRIS FLOW ACTIVITIES IN THE THREE-GORGE RESERVOIR AREA

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Natural Disaster Reduction in China 2003年第3期 10-16页

作者： Tan Bingyan (The Southwest Research Branch, Chinese Academy of Railway Sciences, chengdu 610031, China)

The water level of the Three-Gorge Reservoir will reach the height of 135m, and the government pays great attention to security of cities/towns and emigration villages that may be affected by debris flow activities. How will the debris flow activities develop when the water level of the Reservoir reaches 175 m in height in 2009? This paper analyzes the change of environment for debris flow before and after storing water comprehensively, and special attention is given to the effects of the Reservoir bank rebuilding-process on debris flow activities, and the probability of appearance of new manmade debris flow due to irrational human activities during the construction of the Reservoir. 11 items of predicted results on the developing trend of debris flow activities in the Reservoir area and a suggestion are presented for relevant branches as references in the discussion and implementation of prevention and control of geological disasters in the Reservoir area.

关键词： debris flow forecast Three-Gorge Reservoir

3D thermo-hydro-mechanical-migratory coupling model and FEM analyses for dual-porosity medium

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Science China(Technological Sciences) 2010年第8期53卷 2172-2182页

作者： ZHANG YuJun 1&ZHANG WeiQing 2 1 State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics, Chinese Academy of Sciences,Wuhan 430071,China 2School of Civil Engineering,Southwest Jiaotong University,chengdu 610031,China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences School of Civil Engineering Southwest Jiaotong University

One kind of 3D coupled thermo-hydro-mechanical-migratory model for saturated-unsaturated dual-porosity medium was established,in which the stress field and the temperature field are single,but the seepage field and the concentration field are double,and the influences of sets,spaces,angles,continuity ratios,stiffness of fractures on the constitutive relationship of the medium can be *** relative three-dimensional program of finite element method was also *** comparing with the existing computation example,reliability of the model and the program were *** a hypothetical nuclear waste repository as a calculation example,the radioactive nuclide leak was simulated numerically with both the rock mass and the buffer being unsaturated media,and the temperatures,negative pore pressures,flow velocities,nuclide concentrations and normal stresses in the rock mass were *** results showed that the temperatures,negative pore pressures and nuclide concentrations in the buffer all present nonlinear changes and distributions that even though the saturation degree in porosity is only about 1/9 of that in fracture,the flow velocity of underground water in fracture is about 6 times of that in porosity because the permeability coefficient of fracture is almost four orders higher than that of porosity,and that the regions of stress concentration occur at the vicinity of two sides of the boundary between buffer and disposal pit wall.

关键词： dual-porosity medium thermo-hydro-mechanical-migratory coupling three-dimensional model FEM analysis

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新型CFRP筋夹片式锚具理论与试验研究

土木工程学报 2011年第10期44卷 67-72页

作者：诸葛萍强士中西南交通大学四川成都610031

提出CFRP筋夹片式锚具新的计算理论,并以此理论为依据设计一种新型CFRP筋夹片式锚具,它由锚杯、四片式夹片、涂砂铝套管或涂砂铜套管组成。在理论推导过程中,将夹片式锚具各组件在长度方向上分成多个等份,对其中各组件任意等份建立力学... 详细信息

提出CFRP筋夹片式锚具新的计算理论,并以此理论为依据设计一种新型CFRP筋夹片式锚具,它由锚杯、四片式夹片、涂砂铝套管或涂砂铜套管组成。在理论推导过程中,将夹片式锚具各组件在长度方向上分成多个等份,对其中各组件任意等份建立力学计算模型,并考虑各夹片间的独立性;通过静载试验对夹片式锚具的锚固性能进行测试,并分析比较锚杯拉应力的理论计算与试验实测结果。结果表明,该CFRP筋夹片式锚具计算理论能计算锚具各点的应力及横向位移,并能预测锚具极限承载力;此夹片式锚具适用于锚固高强CFRP筋,它的平均锚固效率系数达到94.9%,且性能稳定;锚杯拉应力的理论计算与试验实测结果较吻合。

关键词： CFRP 锚具夹片理论分析静载试验

地理信息系统技术支持下的泥石流流域产沙研究

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水土保持学报 1995年第2期9卷 26-31页

作者：徐弘西南交通大学

影响泥石流流域产沙的自然因素众多，在地面因素中起重要作用的主要有地形地貌特征、地表覆盖类型、地质背景条件、不良地质现象等。本文在地理信息系统技术支持下，应用模糊数学的理论和方法建立了泥石流流域产沙分级评价模型，该模型... 详细信息

影响泥石流流域产沙的自然因素众多，在地面因素中起重要作用的主要有地形地貌特征、地表覆盖类型、地质背景条件、不良地质现象等。本文在地理信息系统技术支持下，应用模糊数学的理论和方法建立了泥石流流域产沙分级评价模型，该模型能准确客观地反映流域内不同区域产沙的情况，并能自动编制流域产沙强度分级图，为流域内泥石流松散固体物质储量的计算提供依据。

关键词：地理信息系统流域产沙分级评价泥石流

ExperimentalVerificationofaDetailedVehicle┐TrackVerticalInteractionModel

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Journal of Modern Transportation 1996年第1期13卷 24-31页

作者： Zhai Wanming Cai Chengbiao Academy of Engineering Sciences, Southwest Jiaotong University, chengdu 610031, China

A theoretical model has been developed to investigate vertical dynamic interactions between railway vehicles and tracks. Wheel rail forces and dynamic responses of vehicle and track components can be simulated with the model. The model has been applied to the study of high speed and heavy haul railway dynamic problems. In order to verify the model completely, a full scale field experiment was performed on the Chinese Datong Qinhuangdao railway. Accelerations of rail, sleeper and ballast were measured and compared with the simulated results both in time domain and in frequency domain.

关键词： railway vehicle track wheel rail interaction model verification