摘要
针对大面积、高填方堆载引起的软土地基变形和稳定性问题,本文对软土地区某堆山工程进行了有限元数值模拟,计算分析了堆山过程中的软土地基固结变形的时间相关性、超静孔隙水压力的分布和消散规律、堆填山体内土工格栅的内力及山体边坡的稳定性。并将有限元计算固结沉降与现场实测沉降进行对比分析,分析结果表明:有限元软件PLAXIS的软土流变模型能较好地模拟软粘土固结变形的时间相关性;在真空堆载联合预压施工结束后,地基土内部的超静孔隙水压力并没有完全消散,这将会导致一定的工后沉降;本文为类似工程设计、施工及数值模拟提供参考。
For the deformation and stability problem of soft soil foundation caused by large and high fill surcharge,a piling hill project in very soft soil area is simulated with the finite element calculation method in this paper. The time-dependent deformation of consolidation,the distribution and dissipation law of excess pore water pressure,the internal force of geogrid in pilling hill,and the hill slope stability during the process of piling hill are calculated. The calculated settlement by the finite element method is compared to the settlement measured on site.The analysis results show that the soft soil creep model of finite element software PLAXIS can well simulate the timedependent deformation of consolidation for soft clay; and the excess pore water pressure in foundation soil does not dissipate entirely after the construction of combined vacuum surcharge preloading,this will cause a certain settlement after construction. This paper provides reference for the design,construction and numerical simulation of the similar engineering project.
出处
《地下空间与工程学报》
CSCD
北大核心
2014年第S2期1788-1793,共6页
Chinese Journal of Underground Space and Engineering
关键词
软土
固结
堆山工程
土工格栅
有限元
very soft soil
consolidation
piling hill project
geogrid
finite element
