倾斜层理岩层中并行地铁隧道围岩施工响应分析

吴青华

doi:10.13204/j.gyjzG22071706

倾斜层理岩层中并行地铁隧道围岩施工响应分析

doi: 10.13204/j.gyjzG22071706

吴青华

中铁二十局集团第三工程有限公司, 重庆 400064

基金项目:

中铁二十局科研项目(cstc2020kqjscx-phxm0183)。

详细信息

作者简介:
吴青华,男,1981年出生,硕士,高级工程师。电子信箱:303237871@qq.com

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出版历程
- 收稿日期: 2022-07-17

Analysis on Construction Responses of Rock Around Parallel Subway Tunnels in Inclined Stratification Rocks

WU Qinghua

Chinese Railway Twenty Bureau Group Engineering Co., Ltd., Chongqing 400064, China

摘要

摘要: 层理构造和隧道间距是相邻隧道围岩掘进卸荷响应敏感性因素,极易诱发围岩变形失稳及地表塌陷。以倾斜层理岩体中在建分离式地铁隧道为背景,将地层倾角作为研究变量,采用FLAC3D有限元软件对隧道围岩的施工响应规律进行研究,并与施工监测数据进行对比验证。结果表明:随着地层倾角的增大,隧道围岩非对称变形的显著性先增大后减小,而地表竖向沉降槽则由单峰V形逐渐向双锋W形转变并趋于显著,沉降槽宽度系数也随之先减小后增大。0.75倍隧道直径范围内围岩应力释放特征显著,于地层倾角为30°时达到峰值,并随径向深度的增大呈非线性减弱。层理两侧围岩应力场非连续性分布的特征,随倾角的减小趋于显著。此外,层理两侧岩体在结构面与隧道边墙轮廓相交位置易发生共轭剪切破坏,应在施工期间进行局部加固。
- 地铁 /
- 施工响应 /
- 数值计算 /
- 倾斜层理 /
- 相邻隧道
Abstract: Both bedding structure of rock and tunnel clearance are sensitive factors to the response of surrounding rock during tunnelling of adjacent tunnels, which easily cause deformation instability of surrounding rock and ground subsidence. Taking dip angles as the research variable, the construction response laws of the rock around tunnels were studied by the finite element software FLAC3D against the background for separate subway tunnels under construction in inclined stratification rocks, which was verified by comparison with the construction monitoring data. The results indicated that the conspicuousness of asymmetric deformation for rock around the tunnel increased first and decreased then with the increase of dip angles, while the vertical settlement trough of the ground gradually changed from the unimodal V-type to the bimodal W-type and tended to be obvious, and the width coefficient of the settlement trough decreased first and increase then. The characteristics of stress release of surrounding rock in the range of 0.75 times the diameter of tunnels was obvious and reached the peak value when the dip angle was 30°, but decreased nonlinearly with the increase of the radial depth. The discontinuous distribution characteristics of the stress field in surrounding rock on both sides of the stratification tended to be conspicuouse with the decrease of dip angle. In addition, the rock mass on both sides of the stratification was prone to conjugate shear failure at the intersection of the structural plane and the side wall outlines of tunnels, where might be reinforced locally during construction.
- subway /
- construction response /
- numerical calculation /
- inclined stratification /
- adjacent tunnel

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