路基区段有砟轨道无缝线路震后稳定性分析

Stability Analysis of Continuous Welded Railway of Ballasted Track on Subgrade Section After Earthquake

为明确不同烈度地震后无缝线路检查内容,建立高速铁路路基区段有砟轨道有限元三维分析模型,输入不同场地实测地震波,分析钢轨温升与地震共同作用下无缝线路的稳定性。结果表明:温升引起的钢轨横向位移明显大于地震引起的,直线段温升60℃和8度地震、曲线段(半径3 000 m)温升55℃和8度地震两种工况下震后钢轨最大横向位移分别为1.855、1.827 mm,小于无缝线路稳定性限值。因此直线段温升不大于60℃、曲线段温升不大于55℃,地震烈度不大于8度时震后无需对无缝线路稳定性进行检查。

In order to clarify the inspection contents of continuous welded railway(CWR)after earthquakes of different intensities,a three-dimensional finite element analysis model of ballasted track in subgrade section of high speed railway was established,and the measured seismic waves at different sites were input to analyze the stability of CWR under the combined action of rail temperature rise and earthquake. The results show that the transverse displacement of rail caused by temperature rise is significantly greater than that caused by earthquake. The maximum transverse displacement of rail after earthquake is 1.855 mm and 1.827 mm respectively under the two working conditions of temperature rise of 60 ℃ and 8 degree earthquake in straight section and temperature rise of 55 ℃ and 8 degree earthquake in curve section(radius 3 000 m),which are less than the stability limit of CWR. Therefore,when the temperature rise of straight section shall not be greater than 60 ℃,the temperature rise of curve section shall not be greater than 55 ℃,and the earthquake intensity is not greater than 8 degree,there is no need to check the stability of CWR after earthquake.