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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 the mechanism of geocell for strengthening soft subgrade bed of railway, three-dimensional finite element analysis of reinforced weak bed of railway reinforced by geocell was carried out based on engineering examples. In the calculation, the Drucker-Prager model is used to simulate the material nonlinearity of soil, and the three-dimensional thin film element is used to simulate the three-dimensional reinforced performance of geocell. The results show that the bigger the modulus of geocell is, the more obvious the effect of reinforcement is. The increase of the modulus of matrix bed has obvious effect on reducing the total and differential settlement of geocell reinforced bed, The effect of horizontal displacement of soil on small bed is small. The increase of filler modulus has a significant effect on reducing the additional stress on the bottom of embankment, which can make the additional stress distribution on the bottom of embankment more uniform.