拉伊铁路施工过渡段路基变形控制技术研究

Research on Subgrade Deformation Control Technology in Construction TransitionSection of Lagos to Ibadan Railway

基于实际工程项目,利用FLAC 3D建立数值模型研究铁路路基过渡段不均匀沉降与加固措施。研究结果表明:提高路基的刚度可减小路基的整体沉降;过渡段沉降最小值出现在其与桥台接触的位置,过渡段沉降最大值出现在其与一般的路基接触的位置;沿线路方向路基表面中心的沉降量均随着路基填料压实度的增大而减小,随着路基填料含水量的增大而增大。

In order to study the differential settlement and reinforcement measures of railway subgrade transition section,based on the actual engineering project of railway,FLAC 3D is used to establish a numerical model and apply it,analyze the deformation characteristics of railway subgrade transition section,discuss the compactness of different subgrade fillers in the transition section and the differential settlement degree of transition section under water containing state,and draw the following conclusions:(1)The overall settlement of subgrade can be reduced by improving the rigidity of subgrade,to reduce the differential settlement of the transition section.(2)The surface center settlement of the subgrade part of the transition section gradually increases with the distance from the abutment,that is,the minimum settlement of the transition section appears at the position where it contacts the abutment,and the maximum settlement of the transition section appears at the position where it contacts the general subgrade.(3)The settlement of the center of the subgrade surface along the line direction decreases with the increase of the compactness of the subgrade filler,and increases with the increase of the moisture content of the subgrade filler.