移动列车荷载作用于单层Euler梁上时地基土的变形分析

Analysis of Foundation Deformation under Single Layer Euler Beam Applied by Moving Train Load

以弹性波动理论及分层法为基础,提出一种计算车辆-轨道-地基土耦合体系动力响应的方法,其中将列车荷载分别简化为移动荷载、单自由度移动质量块及双自由度移动体系,轨道模拟为单层的Euler梁。考虑车辆-轨道-地基土的协同工作,计算地基土的变形。计算分析表明:1)地基土变形最大值出现在荷载作用点附近;2)将列车荷载仅仅简化为移动荷载是不合理的;3)车辆重量对地基土变形影响较大;4)车辆与轨道结构本身均有一定的减振功能。同时,与同类研究方法相比,该方法有计算量小的优点。研究成果可为研究由列车振动荷载引起的环境振动分析和评价提供参考。

A method for determination of dynamic response of the train - track - foundation coupled system was established based on the theory of elastic waves and multi - layered method. The train load was modeled respectively as moving load, single degree of freedom moving mass and two degree of freedom moving system. And the track was simplified as a single layer Euler beam. The foundation deformation was calculated considering the coupling effect of train, track and foundation. The results show that （ 1 ） the maximum foundation deformation occurs near the load application point; （2） it is unreasonable to simplify train load as moving load only; （3） train weight has large influence on foundation deformation; （4） train and track themselves have some function to mitigate the vibration. In comparison with other methods, this method has the advantage of small computer time consuming. The results can provide reference to environmental vibration analysis and evaluation induced by moving train load.