土工格栅在复合地基中对桩与土的作用机制数值分析研究

Numerical Analysis on Performance of Geogrid in Piles-soil Composite Subgrade

土工格栅加筋垫层复合地基近年来在处理软土路基中得到了广泛应用,但土工格栅在复合地基中对桩与土的作用机制,尚无系统研究。基于弹塑性摩尔库仑模型,采用PLAXIS有限元软件,详细分析了无土工格栅和有土工格栅在不同抗拉强度下对路基沉降、侧向位移,桩的轴力和剪力以及基础的应力扩散等影响,得到土工格栅能有效减少路基沉降及侧向位移等结论,对于路基工程中土工格栅强度的选取及其它应用具有一定的指导作用。

Composite subgrade with geogrid has been widely used in treating soft clay foundation,but the performance of the geogrid has seldom been studied systematically.Based on Mohr-Coulomb failure criterion,the settlement,lateral displacement of the subgrade,axial force,shear stress of the piles and diffuse of the stress have been analyzed in this paper using two-dimensional finite element software PLAXIS.The models of foundation without geogrid and with geogrid of various strengths have been studied in detail.Results show that the settlement and the lateral displacement decrease clearly using geogrid.This paper could be a good guidance on selecting geogrid in design and construction.