›› 2018, Vol. 39 ›› Issue (8): 3047-3054.doi: 10.16285/j.rsm.2016.2721

• Numerical Analysis • Previous Articles     Next Articles

Face stability analysis for a shield tunnel considering spatial variability of shear strength in sand

CHENG Hong-zhan1, 2, CHEN Jian1, 2, HU Zhi-feng1, 2, HUANG Jue-hao1, 2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-11-23 Online:2018-08-11 Published:2018-09-02
  • Supported by:

    This work was supported by the Key Development Project Supported by One Hundred Person Project of Chinese Academy of Sciences (KZZD-EW-TZ-12) and the Science and Technology Service Network Initiative Supported Chinese Academy of Sciences (KFJ-EW-STS-122).

Abstract: The conventional analysis methods for face stability of shield tunnels always assume that the soil is homogeneous, isotropic medium, and ignore its heterogeneity. Therefore, the influence of spatial variability of shear strength on face stability in sand is investigated in this paper. Based on random field theory, three dimensional random fields of friction angle are generated using the covariance matrix decomposition method. The performance of the coefficient of variation and the auto-correlation distance of friction angle is analyzed to explore the influence of that on the failure mechanism and the critical support pressure. Meantime, the selection of the characteristics value of critical support stress is discussed by probabilistic analysis approach. Results show that the spatial variability of friction angle does have significant influence on the stability of tunnel face. The critical support stress scatters as the coefficient of variation of friction angle increases. The failure mechanism is closely related to the auto-correlation distance. When the auto-correlation distance is close to the tunnel diameter, the local failure may happen. The concept of characteristics value of critical support stress is proposed and defined preliminary based on the probability of failure.

Key words: tunnel, face stability, spatial variability, failure mechanism, supporting stress

CLC Number: 

  • TU 431

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