辽西风积土路基振陷研究及数值模拟

随着铁路车辆轴重增大、速度提高以及行车密度加大,长期行车必然使路基产生较大的累积塑性变形,因此对路基振陷的进一步研究已刻不容缓。本文主要以辽西高速铁路沿线的风积土路基为研究对象,取其原状土,通过室内常规土工试验获取风积土的基本物理和力学参数;根据试验结果,对风积土在长持时动荷载下的振陷量进行回归分析,进而得出预测振陷的方法;基于MIDAS软件,进行风积土路基在列车振动荷载下的振陷的数值模拟,根据模拟过程中参数的调整,得出风积土路基振陷量随参数的变化关系;最后,提出针对风积土路基抗振设计和隔振措施,进而得到用于指导风积土路基抗振和隔振措施的统一设计方法。

Study on Subsoil Settlement and Numerical Simulation of Eolian in West Liaoning

Long-term traffic is bound to bring a greater accumulated plastic deformation with the growing masses,the improving speed and the increasing train density.Therefore,it is urgently needed to further research roadbed vibration.This paper mainly studies subsoil settlement of eolian in west Liaoning and takes its undisturbed sample to study,basic physic and mechanics parameters of eolian through indoor conventional geotechnical experiment.Based on the dynamic strength test results compare those with direct shear test results and consider train cycle load as well as dynamic strength and static load by using the dynamic strength relationship.Finally,according to the test results,the high-speed trains regressive analysis for settlement amount is made,and the prediction methods of settlement are obtained.Subsoil subgrade numerical simulation under the train vibration load based on Midas software is made,we get the relationship between settlement amount and some parameters through parameters adjustment in the simulation process.Finally the roadbed vibration design and roadbed isolation measures are proposed,and the unified design method is obtained.