土工格栅加筋砂土的二维等价有限元解析方法

通过试验以及解析结果的分析与比较，针对土工格栅加筋砂土提出了一种简单的二维等价有限元解析方法．有限元解析中砂土的本构关系采用了应变硬软化弹塑性模型，同时也考虑了砂土强度的各向异性以及应力状态的依存性，土工格栅加筋材则简化为板状弹性材料．通过对一组实验结果以及解析结果的分析，合理地得出了土工格栅的配置密度与等价有限解析中加筋材与砂土接触面摩擦角的定量关系．结果表明，在土工格栅的配置形状以及刚性已知的情况下，利用提案的二维等价有限元方法可以较为精确地模拟加筋土的变形与强度特性。

Equivalent Two Dimensional Finite Element Method of Plane Strain Compression on Geo-grid Reinforced Sand

By making use of the results obtained from the physical tests and the related finite element method(FEM) analyses,an equivalent FEM numerical method of plane strain compression on geogrid-reinforced sand was proposed.In the finite element(FE) analysis,strength anisotropy,pressure dependency of strength,strain-hardening and -softening and shear banding (or strain localization) were considered for sand.The geo-grid was modeled as a planar reinforcement in the plane strain FE analysis.By integrating the results from the FEM and the physical tests,a quantitative relationship was obtained between the reinforcement covering ratio of actual three-dimensional reinforcement and the equivalent interface friction angle in two dimensional plane strain FE analysis.It was found that the proposed method could simulate the stress-strain relationship on geo-grid reinforced sand very well.