土工格栅和水泥搅拌桩加固软基数值分析研究

Numerical analysis on soft soil foundation reinforced by geogrid and cement pile

基于有限元法模拟土工格栅和水泥搅拌桩加固软基,分析软基的固结行为及路堤填土高度、桩弹性模量、桩间距对路堤沉降与固结行为的影响。采用了圆柱形单元结构模型,在模型中应用比奥特固结理论与剑桥模型进行耦合分析,着重对路堤沉降、土拱比、综合效率系数进行了分析。得出了使用土工格栅与水泥搅拌桩能有效地减小软基沉降的结论,并对路堤荷载转移机理进行了阐释。

Based on the finite element method,the time-dependent behavior of soft soil foundation reinforced by geogrid and cement pile and the influence of fill height,pile spacing and pile elastic modulus on embankment settlement and the consolidation behavior were analyzed. The cylindrical unit model was used,and Biot consolidation theory coupling with the Cambridge model is applied to analyze the settlement of embankment,the soil arch ratio and comprehensive efficiency coefficient.The results indicate that using cement pile and geogrid can effectively reduce the settlement of soft foundation and accelerate the consolidation. The load transfer mechanism of embankment is explained.