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Volume 53 Issue 11
Nov.  2023
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Article Navigation >  INDUSTRIAL CONSTRUCTION  > 2023  >  53(11): 29-35,87
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Citation: WU Qinghua. Analysis on Construction Responses of Rock Around Parallel Subway Tunnels in Inclined Stratification Rocks[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(11): 29-35,87. doi: 10.13204/j.gyjzG22071706
shu

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

doi: 10.13204/j.gyjzG22071706

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

  • Received Date: 2022-07-17
    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.
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