土工格室加固浅层饱和黄土地基的有限元分析

基于MARC有限元软件,采用研编的Goodman单元用户子程序,对用土工格室处理浅层饱和黄土地基的效果进行了有限元分析(FEA),结果表明:土工格室的有效影响深度为饱和黄土层厚度的50%左右,处理后的饱和黄土地基,水平位移在影响深度范围内可减小约17%左右;竖向位移也得到了一定的减小,最大可减小5%左右;最大竖向应力值减小35%左右;土工格室的加固厚度对路堤总沉降变形影响不大,但对水平位移影响较明显;相同工况下土工格室的布置位置对处理效果影响不大。结合工程实践,对有限元分析结果和现场实测数据进行对比分析,结果表明:土工格室加固方法能有效地处理浅层饱和黄土地基。

Finite element analysis of shallow saturated loess reinforced with geocell

Based on the finite element software-MARC and user's subroutine of Goodman element,authors analyze the effects of shallow layer saturated loess foundation treated with geocell. The results show that impact depth of geocell is about 50% of saturated loess foundation, and horizontal displacement in the impact depth is reduced about 17%. The vertical displacement is decreased about 5% and the value of maximum vertical stress is reduced about 35%.The total settlement is not affected by the thickness of geocell layer, but the horizontal displacement is affected distinctly by the thickness. And the effect of treatment is influenced lightly by the different arrangement place at the same case. Combined with engineering practice, the results of field measurements are contrasted with FEA. It is effective to reinforce shallow saturated loess with geocell.