【摘要】 地铁明挖法施工有时不可避免的要以较近的距离从高楼大厦的地基临域内穿过,这将增大明挖法设计和施工的难度,因此基坑支护成为地铁隧道建设中的工程难题之一。文章以北京地铁十号线区间明挖法施工段为工程背景,采用FLAC3D数值分析软件模拟地铁隧道基坑开挖的各施工步序,分析了围护结构和基坑周边地表的变形规律以及围护桩参数(桩长、桩径)的变化对基坑稳定性的影响,最后就模拟结果与实测数据进行了对比研究。研究为北京地铁十号线明挖法设计和施工提供了科学依据,对于其他同类工程研究也具有一定的借鉴意义。更多还原

【Abstract】 It is inevasible for the MTR construction with cut and cover method to pass more closely through the foundation of tall buildings,which can make the MTR designing and constructing more difficult,so the supporting of the foundation pits is one of the toughest problems during the open excavation construction of metro tunnels.In this paper,we analyze the support structure and the deformation law of the pit surroundings during the excavation of foundation pit of the open-excavation section in No.10 metro line of Beijing by FLAC3D simulation method,the effect of the change of the parameters(such as the length and the diameter of the pile) on the foundation pit stability is also studied.Comparison of the simulated result with the monitored data is presented in the end of this paper.更多还原