Geomechanics and Engineering

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Surrounding rock pressure of shallow-buried bilateral bias tunnels under earthquake

  • Liu, Xin-Rong (School of Civil Engineering, Chongqing University) ;
  • Li, Dong-Liang (School of Civil Engineering, Chongqing University) ;
  • Wang, Jun-Bao (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Wang, Zhen (School of Civil Engineering, Chongqing University)
  • Received : 2015.04.04
  • Accepted : 2015.05.20
  • Published : 2015.10.25
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Abstract

By means of finite element numerical simulation and pseudo-static method, the shallow-buried bilateral bias twin-tube tunnel subject to horizontal and vertical seismic forces are researched. The research includes rupture angles, the failure mode of the tunnel and the distribution of surrounding rock relaxation pressure. And the analytical solution for surrounding rock relaxation pressure is derived. For such tunnels, their surrounding rock has sliding rupture planes that generally follow a "W" shape. The failure area is determined by the rupture angles. Research shows that for shallow-buried bilateral bias twin-tube tunnel under the action of seismic force, the load effect on the tunnel structure shall be studied based on the relaxation pressure induced by surrounding rock failure. The rupture angles between the left tube and the right tube are independent of the surface slope. For tunnels with surrounding rock of Grade IV, V and VI, which is of poor quality, the recommended reinforcement range for the rupture angles is provided when the seismic fortification intensity is VI, VII, VIII and IX respectively. This study is expected to provide theoretical support regarding the ground reinforcement range for the shallow-buried bilateral bias twin-tube tunnel under seismic force.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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