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Volume 46 Issue 11
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YANG Feng, GAO Yikang, QIN Aohan, SONG Zhihui, ZHAO Lianheng. Failure analysis of tunnel face influenced by overload and longitudinal slope[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(11): 2323-2332. DOI: 10.11779/CJGE20230733
Citation: YANG Feng, GAO Yikang, QIN Aohan, SONG Zhihui, ZHAO Lianheng. Failure analysis of tunnel face influenced by overload and longitudinal slope[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(11): 2323-2332. DOI: 10.11779/CJGE20230733
shu

Failure analysis of tunnel face influenced by overload and longitudinal slope

  • 1.

    School of Civil Engineering, Central South University, Changsha 410075, China

  • 2.

    Hubei Rolleader Technology Co., Ltd., Wuhan 430051, China

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  • Received Date: July 31, 2023
  • Available Online: April 23, 2024
    Graphical Abstract
    • Abstract
  • Aiming at the stability of excavation face of tunnels under the influence of surface overload and longitudinal slope, an initial triangular mesh updating strategy derived from the structural failure mechanism is proposed. The computation is conducted by using the upper bound method with the rigid translatory moving elements (UB-RTME) with nonlinear programming to generate stability charts for the load factor σs/c and obtain the slip line failure modes. The results show that the range affected by the failure modes and the major failure domain are given by both the UB-RTME slip line mesh and the Optum G2 adaptive encryption mesh. The range of failure area is determined by the effective discontinuities and element velocity characterized by the UB-RTME. The quantitative data of the failure area S/D2 and the relationship between the slip line failure modes and the influencing factors are provided. The load factor σs/c decreases significantly with the increase of the longitudinal slope angle θ, increases with the increasing buried depth ratio C/D. It decreases with the increase of the gravity coefficient γD/c while increases nonlinearly with the increase in the internal friction angle ϕ. For the case with large values of C/D and ϕ, the mesh density will significantly affect the accuracy of the σs/c numerical solution obtained by the UB-RTME operation. With the increase of the mesh density, the accuracy of the calculated results of σs/c is significantly improved, and the slip line reflecting the failure characteristics becomes smoother.
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    • References (24)
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