弹塑性有限元评价格栅加固公路软土地基效果

目的评价格栅不同加铺方案的效果．方法在利用3轴压缩剪切试验确定土体参数基础上。建立土工格栅加固软土地基有限元分析模型，运用该模型对土工格栅加固的软土地基受力情况、位移和软土地基屈服情况进行研究，分析土工格栅不同设置方案在分级加载的情况下对公路软土地基的加固效果．结果利用土工格栅加固软土地基，能够有效减少软土地基竖向位移。增加软土地基承载力，其主要原因是侧向应力的增加。计算结果与现场观测数据拟合性较好．结论土工格栅铺设在排水垫层底部要比铺设在排水垫层顶部效果更好，研究成果为今后利用土工格栅加固软土地基的设计提供参考．

Reinforcement Effect of Geogrid Reinforced Soft- Soil Foundation Assessed by Elastic- Plastic Finite Element

The article attempts to evaluate the effects of different geogrid installation.Based on the soil parameters determined by triaxial compressional shear tests,a finite element analytical model of geogrid reinforced soft-soil foundation is established.Using the model,the force applied on the geogrid reinforced soft-soil foundation,the displacement and the yield situation of the soft-soil foundation are studied.In addition,different effects of reinforced soft-soil foundation under graded load applications in different geogrid designs are analyzed.It turns out that reinforced soft-soil foundation using geogrid can reduce the vertical displacement effectively and increase the load bearing capacity of soft-soil foundation because of the increase in lateral stress.Compared with the data measured on the spot,the calculation result and the measured result show perfect goodness of fit.The calculation result shows that better effect can be obtained by putting geogrid under the drainage blanket rather than on the top of the draining bed.The article provides a reliable basis for the design of using geogrid to reinforce soft-soil foundation in future.