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本文以毗邻运营中的天津地铁1号线的陆家嘴广场基坑工程为背景,说明如何运用PLAXIS有限元软件建立二维模型,分析基坑开挖对毗邻的地铁运营线路及其附属结构的影响,从而确定一次性整体开挖方案;并采用合理的支护形式、支撑体系和针对地铁运营线路的保护措施,在确保地铁线路安全运行和基坑顺利开挖的前提下,尽可能做到节约投资、方便施工、加快施工进度,为同类工程的设计与施工提供了有益的参考。
This paper uses the background of the pit project of Lujiazui Plaza, adjacent to Tianjin Metro Line 1, to illustrate how to use PLAXIS finite element software to build a two-dimensional model and analyze the impact of excavation on adjacent subway lines and their associated structures. In order to determine the one-time overall excavation plan, and adopt reasonable support forms, support systems, and protection measures for subway operation lines, we must try our best to save investment under the premise of ensuring the safe operation of subway lines and excavation of foundation pits. It facilitates construction and speeds up construction progress, providing useful reference for the design and construction of similar projects.