摘要
某工程施工质量检验过程中发现CFG桩复合地基增强体明显偏离设计位置。针对此问题,根据现场CFG桩复合地基增强体单桩静载荷试验、复合地基静载荷试验以及桩间土浅层平板载荷试验的结果,对实际状态下CFG桩复合地基承载力进行了综合分析和评估;同时,采用PLAXIS 3D软件内置的桩单元模拟CFG桩复合地基增强体,分别按设计桩位和施工桩位两种情况建立三维数值模型,进行了地基和基础的协同作用分析,对两种情况下的基础底板的沉降以及基础底板和基础梁的内力进行了对比分析,提出将原设计中为0.9m厚的筏板增加至1.0m厚的处理措施。
It was found that CFG piles deviated significantly from the design position in a composite foundation project under construction. According to the static load test on single pile of composition foundation,the static load test of composite foundation and the shallow plate load test on the subsoil surrounding the CFG piles,the bearing capacity of current composite foundation with CFG pile was evaluated. Meanwhile,pile unit built-in PLAXIS 3D was used to simulate CFG pile,and three-dimensional numerical models were see up on conditions of design pile position and construction position respectively to carry out the interaction analysis of foundation and ground. The settlement of foundation slab and internal forces of raft and beams in two conditions were analyzed and compared. The measure of increase raft thickness from 0. 9m to 1. 0m was proposed.
出处
《建筑结构》
CSCD
北大核心
2014年第20期126-129,104,共5页
Building Structure
关键词
CFG桩复合地基
桩位偏差
协同作用
PLAXIS
3D
三维数值分析
composite foundation with CFG pile
pile position deviation
interaction
PLAXIS 3D
three-dimensional numerical analysis
