基坑施工对临近地铁隧道结构安全性影响分析

Analysis of the Influence of Foundation Pit Construction on the Safety of Adjacent Subway Tunnel Structure

基于临近兰州地铁建筑施工项目,采用三维有限元分析方法,对地铁隧道结构的受力和变形特征进行研究和分析。通过调研国内外类似研究方法,确定本项目施工对轨道交通结构安全影响的变形控制标准;分析认为基坑开挖会对地铁隧道结构产生一定的变形和应力变化,但均在规范控制值范围内,对隧道结构受力的变化影响较小;拟建项目建成后的附加荷载不会直接扩散至隧道结构上,对轨道交通结构的受力影响可控;运用的分析评价方法和工程案例可为既有地铁隧道安全的影响评价提供参考。

Based on the construction of the subway building near Lanzhou,the stress and deformation cha-racteristics of the subway tunnel structure are analyzed by using the three-dimensional finite element analy⁃sis method.By analyzing and researching similar research conclusions at home and abroad,establish defor⁃mation control standards for the impact of construction on the safety of rail transit structures in this project;The analysis shows that the excavation of foundation pit will produce certain deformation and stress changes in the subway tunnel structure,but they are within the range of authority control values,and have little im⁃pact on the changes in the stress of the tunnel structure;The additional loads after the completion of the pro⁃posed project will not directly spread to the tunnel structure,and the stress impact on the rail transit struc⁃ture is controllable;The analysis and evaluation methods and engineering cases used in this paper can pro⁃vide reference for the safety impact assessment of existing.