考虑渗流-应力耦合基坑开挖降水数值分析  

Numerical Analysis of Seepage-stress Coupling of Deep Foundation Pit Excavation

作　　者：杨春山[1] 何娜 张雅宁[3] 

机构地区：[1]华南理工大学土木与交通学院,广东广州510641 [2]广东理工职业技术学校,广东广州510500 [3]广东工业大学土木与交通学院,广东广州510006

出　　处：《广东工业大学学报》2013年第4期43-48,共6页Journal of Guangdong University of Technology

基　　金：国家自然科学基金资助项目(51108190);华南理工大学亚热带建筑科学国家重点实验室自主研究课题资助项目(2012ZC27)

摘　　要：运用GTS(Geotechnical and Tunnel analysis System)软件对基坑开挖降水过程进行了详细数值模拟,对比分析了基坑开挖时,考虑降水引起的地下水渗流作用和不考虑渗流作用下的基坑周围土体位移、支护结构位移以及内力,同时分析了止水帷幕、渗透系数及降水深度对基坑力学性能的影响.分析结果表明:渗流对基坑工程影响不容忽视,深基坑稳定性分析应当充分考虑地下水渗流的作用;设置止水帷幕可以有效地减小基坑周围土体的变形,渗透系数与降水深度的加大均会使地表沉降值增大.The Geotechnical and Tunnel analysis System was used to simulate the detailed process of foundation pit excavation. The soil displacement, internal force and displacement of supporting structure under the conditions of considering or without considering seepage caused by foundation pit excavation were compared and analyzed. Meanwhile, the effects on the mechanical properties of deep foundation pit caused by waterproof curtain, the permeability coefficient and the depth of precipitation were analyzed. The results show that the impact of seepage on foundation pit should not be ignored, and in the deep foundation pit stability analysis, the role of groundwater seepage should be fully considered. Setting water curtain can effectively reduce the deformation of soil around the foundation pit, and enlarging permeabili- ty coefficient and precipitation depth will increase the surface subsidence.

关 键 词：深基坑 降水 数值模拟 耦合作用 

分 类 号：TU463[建筑科学—结构工程]