沪昆客专软弱粉质黏土斜坡填筑路基变形及稳定性分析

Deformation and Stability Analysis of Roadbed Filled with Soft Silty Clay in Shanghai-Kunming High-Speed Railway

以沪昆客运专线云南段粉质黏土斜坡填筑路基及其工程处理措施为分析对象,针对不同加固处理方案,采用三维快速拉格朗日有限差分法,建立土工格栅及CFG桩加固粉黏土斜坡路基的模型,分析了粉质黏土斜坡填筑路基在无工程措施时、CFG桩及土工格栅加固后的变形与稳定性规律.结果表明:粉质黏土层是主要滑移层,在无工程措施时,路基产生较大竖向沉降、差异性沉降及水平滑移,影响路基稳定性;综合采用CFG桩加固粉质黏土地基,土工格栅加固路堤土体方案,控制路基变形,提高其稳定性的效果显著.

Taking the silty clay slope of Yunnan section of Shanghai-Kunming High-speed Railway as the analysis object and aiming at the different reinforcement schemes,a three-dimensional fast Lagrangian finite difference method is used to fill the subgrade and its engineering treatment measures.The model of reinforcing silt slope roadbed with geogrids and cement flyash gravel(CFG)piles are established.The deformation and stability of the silty clay slope embankment are analyzed when there are no engineering measures and reinforced by CFG piles and geogrids.The results show that the silty clay layer is the main slip layer,and in the absence of engineering measures,the subgrade produces larger vertical settlement,differential settlement and horizontal slip,which affects the subgrade stability.The CFG piles are used to reinforce the silty clay foundation,and the geogrids are used to reinforce the soil scheme of the embankment,so that the deformation of the roadbed is controlled,and the stability is improved.