压路机碾压荷载在施工期对路基拼接变形影响的数值分析

Numerical Analysis of Impact of Different Roller Loads on Subgrade Connecting in High-Speed Railway

以合肥铁路枢纽改造工程为研究对象,路基拼接中应用的不同压路机碾压荷载为研究目标,通过FLAC软件就不同路基高度下应用不同压路机荷载对既有线列车安全运营和路基稳定性的影响进行了数值模拟计算。结果表明,同一路基高度,不同压路机荷载作用下,坡脚A点和新、老路基搭接处B点的垂直变形增量随压路机荷载的增大而增大;相同压路机荷载下随着路基高度的增加,老路基面、坡脚点以及新老路基搭接处的垂直方向变形与路基高度不成线性关系,采用6 m高度的路基更为合理,有利于线路列车运行的安全性和路基整体的稳定性。

Taking the hub project of Hefei railway as research objectives, numerical calculation had been executed with differrent roller loads and subgrade heights to existing lineg safe operation and subgrade stability by FLAC software. The results show that the increment displacement of point A and point B increases with the roller loadg increasing at the same subgrade height. And in the same roller load, the deformation of key points in the vertical direction have non - linear relationship with the subgrade height. According to the minimum deformation, the scheme of 6m subgrade height is chosen which is beneficial to the traing safety and stability of whole subgrade. It is instructive to control differentia deformation for the connecting subgrade projects in highspeed railway.