桩与土工格栅联合作用对高速公路路堤地基承载力影响的有限元分析

FE analysis of the ultimate bearing capacity of geogrid-reinforced and pile-supported foundation of highway embankment

针对目前国内采用桩与土工格栅联合作用加固高速公路软土地基的新方法,利用平面应变弹塑性有限元方法,建立路基的二维有限元模型进行数值分析计算。对人们普遍关注的土工格栅在提高地基承载力和稳定性方面的有效性进行分析,并研究在置换率相同情况下桩径和桩间距的变化以及在置换率变化条件下不同桩径和桩间距的选取对复合地基承载力的影响规律,为今后桩基的优化设计提供可靠的参考依据。

Based on a new highway subsoil reinforce measure by using both geogrid and pile,the plane strain finite element method is used to calculate the ultimate bearing capacity of the foundation of road embankment. Finite element model of the geogrid-reinforced and pile-supported foundation of the embankment is built by PLAXIS. The efficiency of the geogrid on top of the piles to improve the soft soil foundation is proved in this paper. With the rate of replacement unchangeable and changeable,the laws of the effect of the pile diameter and distance in improving bearing capacity of the foundation are presented,in order to propose some reliable and valuable suggestions in the pile-supported foundation optimized design.