铁路路基动态变形模量的数值模拟分析

介绍铁路路基动态变形模量理论计算公式的推导及动态变形模量的测试原理,采用有限元软件模拟动态变形模量的测试过程,分析承载板与土体接触压力、路基动态变形模量的影响因素,并计算动态变形模量的有效测试深度.结果表明:在承载板中心一定范围内,接触压力模拟结果较理论计算值大;土体的动弹性模量对接触压力影响很小,可以忽略;路基动态变形模量测试冲击荷载作用下,土体只发生弹性变形;动态变形模量与土体动弹性模量呈线性关系,路基动态变形模量的模拟结果大于理论计算值;土体的泊松比对动态变形模量影响较小;动态变形模量有效测试深度建议取0.5~0.6 m.

Numerical Simulation Analysis on Dynamic Deformation Modulus of Railway Subgrade

This paper introduced the derivation of theoretical calculation formula of dynamic deformation modulus Evd of railway subgrade and its testing principle.The finite element software was used to simulate the testing process of dynamic deformation modulus.The influencing factors of contact pressure between bearing plate and soil and dynamic deformation modulus of subgrade were analyzed,and the effective testing depth of dynamic deformation modulus was calculated.The results show that in a certain range of the center of the bearing plate,the contact pressure simulation results are larger than the theoretical calculation values.The dynamic elastic modulus of soil has little effect on the contact pressure,which can be ignored.Under the impact load of dynamic deformation modulus testing,only elastic deformation occurs in the soil.There is a linear relationship between the dynamic deformation modulus and the dynamic elastic modulus of the soil,and the simulation result of the subgrade dynamic deformation modulus is greater than the theoretical calculation value.The Poisson's ratio has little effect on the dynamic deformation modulus of soil.The effective test depth of dynamic deformation modulus is recommended to be 0.5~0.6 m.