土工格栅加筋土挡墙施工工况有限元分析

介绍了土工格栅加筋土挡墙的结构特征,及土工格栅加筋土的有限元分析原理,并用Mohr-Coulomb模型作为加筋土中的土体的计算模型,用线弹性模型模拟土工格栅,用Goodman单元模拟土体和土工格栅之间的接触关系,对一典型工程实例的施工状态进行了有限元分析,得到了土工格栅加筋土挡墙不同施工阶段的受力和变形特征。计算结果表明,加筋土挡墙的破裂面是一条圆弧面,挡墙在填土过程中安全系数逐渐减小,基底应力分布和筋材拉力与实测值吻合较好,证明了该有限元分析方法的可靠性。

Finite Element Analysis on Geo-grid Reinforced Earth Retaining Wall at Construction Stages

The structural characteristics of the geo-grid reinforced earth retaining wall are introduced at first,and the finite element method(FEM) used in the geo-grid reinforced earth retaining wall is also given.In this finite element method,Mohr-Coulomb model is used to simulate the computation model of soil,the linear-elastic model is applied to simulate the geo-grid and Goodman model is adopted to simulate the relationship between the soil and the geo-grid.The construction situation of one typical engineering example is analyzed by FEM,and the stress distribution and deformation features of geo-grid reinforced earth retaining wall at different construction stages are obtained.The computation result shows that:the failure surface at geo-grid reinforced earth retaining wall is an arc surface,and the safety coefficients decrease gradually with the soil filling.At last,the stress distribution of floor and the pull of reinforced materials are accordance with the data of field measure,which verifies the reliability of FEM proposed.