稳定作业下道床动态行为的离散元模拟与试验研究

针对稳定作用下有砟道床的研究.采用具有真实几何形状的簇颗粒模拟道碎,建立简化缩小比1:8稳定作业下道床三维离散元模型,模拟分析不同激振频率作用下道床的宏细观动态行为.建立与轨枕模型同尺寸的试验模型,通过试验与仿真分析中轨枕的沉降量对比验证,确定试验以及构建的轨枕-道床模型的有效性与可靠性.进一步利用该试验分析道砟振动加...

DEM Simulation and Experimental Research on Dynamic Behavior of Track Bed under Stable Operation

This is a study of the ballast bed under stabilization.Clustered particles with real geometric shapes are used to simulate the track fragmentation,and a three-dimensional discrete element model of the track bed under the simplified reduction ratio of 1:8 is established to simulate and analyze the dynamic behavior of the track bed under different excitation frequencies.The experimental model of the same size is verified by comparison of the settlement of the sleeper in the test and simulation analysis to determine the validity and reliability of the test and the sleeper-track bed model constructed.This test is further used to analyze the meso-dynamic response of the ballast vibration acceleration ballast and determine the change process of energy migration during the stabilization process.The results show that the vibration acceleration of ballast during the stabilization process decreases first and then increases with the increase of the excitation frequency.The ballast vibration response is most obvious at 36 Hz.At this time,the ballast vibration energy is the highest,and the energy ratio before and after stabilization is the highest at 36 Hz.That is,the stabilization effect is the best.Ballasts in the shoulder area will have both vertical and horizontal movements.