季节性降雨变化对长三角高速铁路路基工后沉降影响分析

Influence of Seasonal Rainfall Changes on Subgrade Settlement during Operation of High-Speed Railway in the Yangtze River Delta

首先对高速铁路路基不均匀沉降影响因素进行了列述分析。利用长三角高速铁路典型路基段沉降监测成果数据及相应监测区域年度降雨时间变化数据,分析了高速铁路路基不均匀沉降形成与路基含水量及年度降雨量变化之间内在联系机理。研究表明:年度季节性降雨导致监测区路堤与地基中含水量增加,从而改变了其内部力学特性引起沉降,使高速铁路监测区路基工后沉降随年降雨变化呈现季节性特征,该结论为铁路路基整治等线路维护工作提供了有益的参考。

Firstly, the influence factors of the inhomogeneous subgrade settlement of high-speed railway were listed and analyzed. With the monitoring data of typical subgrade settlement of high-speed railway in the Yangtze River Delta and the time variation data of seasonal rainfall at the correspondingly monitoring region, the internal relation between the inhomogeneous subgrade settlement of high speed railway and the changes of subgrade moisture content and seasonal rainfall was analyzed. The studies show that seasonal rainfall results in the water content increase of embankment and subgrade in monitoring area, which changes the internal mechanical properties and causes the settlement. Therefore, the settlement during operation of high-speed railway subgrade in monitoring area presents seasonal characteristics with the annual rainfall variation. The above conclusion provides a useful reference for railway subgrade treatment and other rail maintenance.