基于有限元的桩体承载环境对复合地基性能影响分析

摘要

This paper focus on the performance of the composite foundation after the foundation treatment. A dramatic finite element model,which incorporating the treatments of sand drain and rigid pile with cap,is established. The results show that the existence of bagged sand well can effectively improve the consolidation efficiency of the foundation to reduce the post construction settlement.Rigid pile shows the significant meaning for the settlement of the foundation. The existence of pile cap can effectively promote the synergistic action of surface soil,reduce the pile-soil stress ratio,and thus reduce the uneven settlement of subgrade.%基于有限单元法,创新地建立了可以考虑刚性桩和砂井联合处理复合地基模型,分析了有无排水和有无桩帽等不同桩体工作环境下处理后复合地基的性能.结果表明:袋装砂井的存在可以有效改善地基固结效率,减小工后沉降;刚性桩对于地基沉降控制更为显著;桩帽的存在可以有效带动表层土协同作用,降低桩土应力比,从而减小路基的不均匀沉降.