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 .
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