大气环境作用下不同排水条件铁路道床层水力性能研究

Effects of Different Drainage Conditions on Hydro-mechanical Performance of the Railway Trackbed Layers Due to Atmospheric Environment

降雨入渗和温度的变化往往是引发高速铁路路基发生大变形的重大诱因。基于非饱和土的基本理论构建铁路路基考虑降雨入渗和温度引起的饱和度差异的热—水—力(THM)耦合计算模型,通过有限元算法对模型进行了计算得到了不同道碴处理下道床层土体的饱和度差异。结果表明沥青道碴很大程度减小了道床层的饱和度;道床断面处不同位置饱和度存在差异;同时,沥青道碴对减小道床层的变形起到了重要作用;道床层的饱和度也与其渗透系数密切相关。

Rainfall infiltration and temperature changes are often major incentive effects caused major roadbed deformation of high-speed railway. Based on the basic theory of unsaturated soil, the ther- mo-hydro-mechanical coupling model considering the effects of saturation and temperature changes was established. The finite element method model was used to calculate the saturation difference of the track bed ballast soil under different treatment. The results show that the bituminous ballast significantly reduce the saturation of track bed. Section of the track bed was different in different locations saturation. Mean- time, the bituminous ballast played an important role in reducing the deformation of the track bed. The saturation of track bed is also closely related to their permeability.