部分开挖基坑内施工CFG桩的稳定性分析  

Analysis of foundation pit stability influence on CFG piles construction in partly excavated foundation pit

作　　者：刘熙媛[1,2] 胡世飞[1] 付士峰 高辉 

机构地区：[1]河北工业大学土木工程学院,天津300401 [2]河北省土木工程技术研究中心,天津300401 [3]河北省建筑科学研究院,河北石家庄050021

出　　处：《辽宁工程技术大学学报（自然科学版）》2013年第11期1470-1475,共6页Journal of Liaoning Technical University (Natural Science)

基　　金：河北省青年科学基金资助项目(E2013202118);河北省建设科学技术研究计划资助项目(2012-156)

摘　　要：为解决基坑工程中由于设备限制CFG桩必须在部分已开挖基坑内进行施工,引起基坑周围地表出现明显的开裂的问题.采用MIDAS/GTS有限元软件建立有限元模型,对不同的施工工况进行模拟,分析施工过程中基坑围护结构的变形以及对周围土体的影响.研究结果表明:CFG桩在部分开挖基坑内施工对基坑底部被动土压力区造成扰动,致使该处土体强度降低,从而导致基坑周围土体变形较大,造成周围地面开裂.由此提出了部分开挖基坑内施工CFG桩的合理方案,为将来类似工程的设计和施工提供指导性意见.In order to solve the problem that the CFG piles must be constructed in the partly excavated foundation pit due to device limitations and obvious cracks on the ground found around foundation pit, a finite element model was established by using the finite element software MIDAS/GTS combining with the practical project. The different construction conditions were simulated and the deformation of retaining structure in the construction process and the influence on the surrounding soil were analyzed. The results show that CFG piles construction in the partly excavated foundation pit causes the passive earth pressure area at the bottom of the foundation pit be disturbed, and the soil strength is reduced so that the soil deformation around the foundation pit is comparatively large and the surrounding ground cracks. Finally, reasonable solution about CFG piles construction in the partly excavated foundation pit was put forward to guide the future design and construction of similar projects.

关 键 词：CFG桩 基坑支护 施工工序 稳定性 MIDAS/GTS 有限元 支护桩 位移 

分 类 号：TU753[建筑科学—建筑技术科学]