基坑开挖对近邻地铁车站和隧道的影响

发布时间：2018-01-29 12:26

本文关键词： 基坑开挖不均匀变形沉降差近邻隧道实测分析　出处：《岩土力学》2016年S2期 　论文类型：期刊论文

【摘要】：对基坑开挖期间近邻地铁车站和隧道变形等进行分析,总结基坑开挖期间近邻地铁车站、隧道变形的发展规律。以量化的形式定义表征隧道不均匀变形程度的不均匀变形参数g_i,并对地铁车站引发的隧道近站部分不均匀变形分布及其大小预测进行研究。研究表明,基坑开挖期间地铁车站表现为上浮而近站隧道表现为沉降;基坑开挖期间地铁车站和近站隧道之间的位移差显著,对隧道结构的损伤严重;基坑开挖对近站隧道的影响范围约为基坑开挖深度的4倍;地铁站引发的近站隧道不均匀变形主要分布在距地铁站1倍基坑挖深的范围内,得到的g_i分布预测公式可对隧道近站部分不均匀变形的大小和分布进行预测。所得结论及某工程参数A、B的取值可供类似工程参考。
[Abstract]:This paper analyzes the deformation of adjacent subway stations and tunnels during foundation pit excavation, and summarizes the adjacent subway stations during foundation pit excavation. The development rule of tunnel deformation. The non-uniform deformation parameter gai, which is used to characterize the degree of non-uniform deformation of tunnel, is defined in the form of quantification. The uneven deformation distribution and its size prediction of the near station caused by the subway station are studied. The results show that the subway station is floating and the near station tunnel is settlement during the excavation of the foundation pit. During excavation, the displacement difference between subway station and near station tunnel is significant, and the damage to tunnel structure is serious. The influence range of foundation pit excavation on the near station tunnel is about 4 times of the excavation depth of foundation pit. The non-uniform deformation caused by the subway station is mainly distributed in the area of 1 times the depth of the foundation pit from the subway station. The prediction formula of gi distribution can be used to predict the size and distribution of non-uniform deformation in the near station of tunnel. The conclusion and the value of the engineering parameter AZB can be used as reference for similar projects.
【作者单位】：浙江科技学院土木与建筑工程学院;
【基金】：浙江科技学院研究生科研创新基金(No.2015YJSKC005)~~
【分类号】：U231;U456.3;TU753
【正文快照】： 1引言随着城市轨道交通和城市建设的快速发展,在既有地铁隧道沿线及周边进行的工程活动变得日益频繁,近邻运营隧道的深大基坑工程活动不可避免。基坑开挖造成地层原有应力场的改变[1],使邻近地铁车站和区间隧道产生附加应力和变形,从而影响隧道结构的安全和地铁列车的正常运行

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