土工格栅在CFG桩复合地基的应用与有限元分析

主要进行了土工格栅在CFG桩复合地基的应用研究与有限元分析。建立有限元模型，分析了CFG桩桩顶碎石垫层内铺设土工格栅情况下桩顶和桩间土的相对位移差，以及土工格栅的受力状况。试验结果显示：CFG桩桩顶碎石垫层内加铺土工格栅对CFG桩复合地基的受力变形和路基沉降量的影响不明显，土工格栅只对CFG桩复合地基起安全储备的作用。同时，通过对试验段沉降与变形的监测分析发现，土工格栅对地基沉降、桩间土的压缩变形的影响基本可以忽略不计，只起安全储备的作用，与有限元分析结果相吻合。

Application and Finite Element Analysis on Geogrid in the CFG Pile Composite Foundation

The paper mainly studies the geogrid＇s application and finite element analysis on CFG pile composite foundation. The finite element model to analyze the relative displacement between the top of pile and soil, and force status of the geogrid in the situation of CFG pile composite foundation with cushion overlaying geogrid. The result shows that CFG pile composite foundation with cushion overlaying geogrid has no significant effect on the CFG pile composite foundation＇s deformation and subgrade settlement, and the geogrid only work as the safety reserve of CFG pile composite foundation. In addition, through monitor and analysis of the settlement and deformation test section found that CFG pile composite foundation with cushion overlaying geogrid has larger settlement, and geogrid has little effect on the settlement of foundation and compression defor- mation of the soil between piles and only work as the safety reserve, it is consistent with the result of finite element analysis.