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本文以杭州紫金港隧道开挖工程为背景,采用位移有限元方法模拟挡墙变位所诱发的地表沉陷,进而评估开挖施工期的安全状态。数值模拟得到了挡墙变位诱发地表沉陷的基本规律,并以最大地表沉陷(wm)与最大挡墙变位(um)的比值(wm/um)来评估基坑的安全状态。研究表明,伴随基坑开挖的进行,墙后土体塑性区逐渐得以发展,比值wm/um也随之呈现逐渐增大的发展趋势,并最终趋于某一临界拐点值。在给定的挡墙位移模式下,wm/um值的大小与基坑安全度之间存在特定相关性。
In this paper, based on the tunneling project of Zijin Port in Hangzhou, the displacement finite element method is used to simulate the surface subsidence caused by the displacement of the retaining wall so as to evaluate the safety status during excavation. The basic law of surface subsidence induced by retaining wall displacement is obtained by numerical simulation. The safety status of foundation pit is evaluated by the ratio of maximum surface subsidence (wm) to maximum wall deformation (um) (wm / um). The research shows that with the excavation of the foundation pit, the plastic zone of soil behind the wall gradually develops, and the ratio of wm / um also shows a trend of increasing gradually, finally reaching a certain critical inflection point. In a given retaining wall displacement mode, there is a specific correlation between the magnitude of the wm / um value and the safety of the pit.