With the development of city underground space, the deep foundation pit stability evaluation become more and more important. Through the monitoring of underground engineering in Beijing city tap water rescue center and FLAC3D numerical model, cable is used to simulate the beam and pile were used to simulate the anchor retaining pile and beam waist, we can obtain the shear displacement simulation of foundation pit wall, the variation of pile top displacement and the axial force of the anchor in different construction stages. Combining with the actual engineering experience, we can obtain the influence of excavation depth on the stability of foundation pit, which can provide reference for similar foundation pit engineering.%随着城市地下空间的发展,深基坑的稳定性评价越来越重要.通过对北京市某自来水抢险中心地下工程进行监测,并采用FLAC3D建立数值计算模型,cable单元模拟锚杆,beam及pile分别模拟腰梁及支护桩,得出不同施工阶段下基坑侧壁的位移、桩顶位移及锚杆轴力的变化规律.结合现场实际工程经验得出开挖深度对基坑侧壁稳定性的影响规律,可为类似基坑工程提供参考.
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