Geomechanics and Engineering

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Visualization analysis of the progressive failure mechanism of tunnel face in transparent clay

  • Lei, Huayang (Department of Civil Engineering, Tianjin University) ;
  • Zhai, Saibei (Department of Civil Engineering, Tianjin University) ;
  • Liu, Yingnan (Department of Civil Engineering, Tianjin University) ;
  • Jia, Rui (Department of Civil Engineering, Tianjin University)
  • Received : 2020.09.15
  • Accepted : 2022.03.19
  • Published : 2022.04.25
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Abstract

The face stability of shield tunnelling is the most important control index for safety risk management. Based on the reliability of the transparent clay (TC) model test, a series of TC model tests under different buried depth were conducted to investigate the progressive failure mechanism of tunnel face. The support pressure was divided into the rapid descent stage, the slow descent stage and the basically stable stage with company of the local failure and integral failure in the internal of the soil during the failure process. The relationship between the support pressure and the soil movement characteristics of each failure stage was defined. The failure occurred from the soil in front of the tunnel face and propagated as the slip zone and the loose zone. The fitted formulas were proposed for the calculation of the failure process. The failure mode in clay was specified as the basin shape with an inverted trapezoid shape for shallow buried and appeared as the basin shape with a teardrop-like shape in deep case. The implications of these findings could help in the safety risk management of the underground construction.

Keywords

Acknowledgement

The authors acknowledge the National Key Research and Development Program of China (Grant No. 2017YFC0805402), the Open Project of State Key Laboratory of Disaster Reduction in Civil Engineering (Grant No. SLDRCE17-01), the Tianjin Research Innovation Project for Postgraduate Students (Grant No. 2021YJSB141) for funding this work.

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