摘要
有砟道床是由碎石道砟组成的一种散粒体结构,道砟颗粒之间的相互作用影响道床结构整体的力学特性。为研究道砟层内部的荷载传递和沉降规律,探明列车行驶过程中道床服役状态演变的机制,基于有限元ABAQUS平台软件,通过编制内部子程序对Chang-Hicher模型进行二次开发,开展道砟集料的常规三轴试验以及碎石道床动力特性试验的数值模拟,从静、动力学角度阐明利用细观解析本构模型模拟道砟力学特性的可行性。进一步利用该模型研究高速列车荷载下道床的动态力学行为,从宏观层面探讨道床不同区域的沉降特征,从细观层面运用玫瑰图来分析道砟间接触力的分布情况和变化规律,分析行车速度和轴重等控制因素对接触力和位移的影响。研究结果表明,列车行驶过程中,荷载作用下方道砟的接触力整体水平最高、枕盒中心处次之,轨枕中心处最小,而这些区域内道砟的竖向位移变化基本相同;行车速度和轴重对道砟间接触力和道床下沉量均呈现正相关关系。
The ballast bed is a kind of granular structure composed of crushed stone ballasts.The interaction between ballast particle affects the mechanical properties of ballast bed structure.In order to study the laws of load transfer and settlement within the ballast layer,and explore the mechanisms of service state evolution of ballast bed during train operation,the Chang-Hicher model was developed by means of internal subroutine based on the finite element ABAQUS platform software.The numerical simulations of the conventional triaxial compression tests of ballast aggregates and the dynamic characteristies tests of ballast bed were carried out,to expound the feasibility of using meso-analytic constitutive model to simulate the mechanical properties of ballast from the static and dynamic perspectives.Further,the dynamic mechanical behavior of ballast bed under moving high-speed train loads was studied using this model to discuss the settlement characteristics of different areas of ballast bed from the macroscopic level,and analyze the distribution and change law of the contact force between ballasts by using the rose diagrams from the microscopic level,and discuss the influence of speed and axle load on contact force and displacement.The results show that during the operation of the train,the contact force of the ballasts below the load position is the highest,followed by the contact force of the ballasts below the center of sleeper box,and the contact force of ballasts below the center of sleeper.However,the vertical displacements of the ballast bed in these areas are basically the same.Besides,there are positive correlations between the train speed and axle load on the ballast contact force and ballast bed settlement.
作者
王威
陈诚
肖键
杨成忠
熊昊
WANG Wei;CHEN Cheng;XIAO Jian;YANG Chengzhong;XIONG Hao(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;School of Transportation Engineering,East China Jiaotong University,Nanchang 330013,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518061,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2024年第6期129-137,共9页
Journal of the China Railway Society
基金
国家自然科学基金(51908215)
江西省自然科学基金(20212BAB204016,20181BAB216030)。
