列车引起的地基土应力状态变化的三维有限元分析  

Stress states of soil elements induced by train passage on the basis of 3D finite element analysis

作　　者：刘雪珠[1,2] 陈国兴[1] 储勇 

机构地区：[1]南京工业大学岩土工程研究所,江苏南京210009 [2]江苏省岩土工程公司,江苏南京210018 [3]南京军区房地产管理局,江苏南京210005

出　　处：《地震工程与工程振动》2010年第2期159-166,共8页Earthquake Engineering and Engineering Dynamics

基　　金：江苏省自然科学基金项目(BK2008368);中国地震局地震工程与工程振动开放实验室基金(2007A02)

摘　　要：将列车移动荷载简化为多个移动轮轴荷载,基于列车-轨道-路基解析模型推求的列车运行时不同时刻、不同位置时作用于路基的振动荷载时程,采用多点输入方式实现列车荷载的移动施加方式,建立路(地)基-场地体系三维有限元动力分析模型,基于Abaqus软件的并行计算集群平台,对轨道交通振动荷载下路(地)基-场地体系的动力反应进行数值模拟,研究了列车荷载作用线正下方地基中的动应力特征及土单元应力状态变化,分析了列车轮轴荷载移动过程中不同深度处土单元的应力路径和主应力轴的旋转。The train moving loads were simplified as a series of moving wheel axes loads and based on the time history of moving loads from track-subgrade analytical mechanical model.The vibration loads in ground induced by the moving marshalling train were simulated by using multi-support excitation.A theoretical model of subgrade-site soil was presented by employing a 3-dimensional finite element method,and based on parallel computing cluster platform of ABAQUS software and the 3D nonlinear analysis method was proposed for studying the nonlinear dynamic responses of subgrade-site soil.The dynamic stress distribution,stress path and principal stress axes rotation of the soil elements at different positions beneath railway embankment during passages of train loads were studied under layered soil conditions.

关 键 词：列车移动荷载 应力路径 主应力轴旋转 三维分析 并行计算 

分 类 号：P315.983[天文地球—地震学]