土工格室加固铁路软弱基床的有限元分析

FEM analysis on geocell reinforcing soft subgrade of railway

在分析土工格室加固铁路软弱基床机理的基础上,结合工程实例,对土工格室加固铁路软弱基床进行了三维有限元分析。计算中采用D rucker-prager模型模拟土体的材料非线性,采用三维薄膜单元模拟土工格室的立体加筋性能。计算结果表明:土工格室模量越大加筋效果越显著;基床填料模量的增大对减小土工格室加筋基床的总沉降和差异沉降有较明显的效果,而对减小基床土的水平位移影响较小;填料模量的增大对减小路堤底面附加应力有显著效果,可使路堤底面附加应力分布更为均匀。

Based on the analysis of reinforcement mechanics grade, and combined with the project case, three dimensional established to analyze the reinforcement mechanics of the soft of the geocell in the railroad soft subfinite element numeric analysis model is subgrade of railroad. In the computation, the Drucker-prager model is used to simulate soilmass＇s nonlinearity and the three-dimensional thin membrane element is used to simulate geocell＇s three-dimensional reinforcement performance. Conclusions can be drawn as follows：The magnitude of geocell modulus is bigger, the reinforcement effect is more obvious. The increasement of subgrade padding modulus has more influence on reducing the geocell subgrade＇s overall settlement and differential settlement, than that on reducing the subgrade＇s horizontal displacement, and simultaneously obviously reduces the subgrade additional stress, makes more uniform distribution of the additional stress.