Abstract: 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?geogrid?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-gfid?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.

Key words: reinforced earth retaining wall , FEM , failure surface , construction stages , stress distribution

摘要： 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。

关键词: 加筋土挡墙, 有限元, 破裂面, 施工期, 应力分布