Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (7): 1833-1844.doi: 10.16285/j.rsm.2021.1763

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Failure mechanism of shield tunnel circumferential excavation face and the influence of the dilatancy effect on the tunnel stability

ZHANG Jian1, QI Rui-yu1, ZONG Jing-yao2, FENG Tu-gen1   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. East China Architecture Design & Research Institute Co., Ltd., Shanghai Underground Space & Engineering Design Institute , Shanghai 200011
  • Received:2021-10-20 Revised:2022-03-28 Online:2022-07-26 Published:2022-08-04
  • Supported by:
    This work was supported by the National Science Foundation of China (51808193, 52178386), the Fundamental Research Funds for the Central Universities (B220202016).

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Abstract: Rigid sliding blocks are used to construct two failure modes of the tunnel's circumferential excavation surface of circular tunnel. The compiled nonlinear programming program is used to solve the optimal upper bound solution of the support force coefficient σT /c (σT is uniformly distributed support load and c is the effective cohesion) and the stratum failure mode so as to reveal the influences of stratum parameters on tunnel stability. A simple and practical simplified formula for the ultimate support force of the tunnel's circumferential excavation surface is proposed. For undrained condition, the failure region is mainly concentrated in the upper part of the tunnel when the tunnel depth ratio H/D (H is the buried depth and D is the tunnel diameter) and the gravity coefficient γD/c (γ is unit weight) are small. With the increase of H/D and γD/c, the starting position of the slip line gradually expands to the bottom of the tunnel along the tunnel contour, and the failure region expands to the horizontal direction. For drainage conditions, there are three main stratum failure modes. When the internal friction angle ϕ and γD/c are large, with the decrease of the dilatancy coefficient, the ultimate supporting force increases significantly, and the range of failure region varies greatly, which may even cause a change in the failure mode. The ultimate supporting force of the tunnel circumferential excavation surface can be quickly obtained through the proposed simplified formulas.

Key words: Shield tunnel, Rigid block method, Failure mechanism, Ultimate support force, Non-associated flow rule

CLC Number: 

  • U 451
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