Guan Zhenchang, Gou Xiaodong, Wang Tao, et al. 2021. Seepage discharge and equivalent permeability coefficient of shield tunnel based on joint effective opening[J]. Journal of Engineering Geology, 29(1): 256-263. doi: 10.13544/j.cnki.jeg.2019-538.
    Citation: Guan Zhenchang, Gou Xiaodong, Wang Tao, et al. 2021. Seepage discharge and equivalent permeability coefficient of shield tunnel based on joint effective opening[J]. Journal of Engineering Geology, 29(1): 256-263. doi: 10.13544/j.cnki.jeg.2019-538.

    SEEPAGE DISCHARGE AND EQUIVALENT PERMEABILITY COEFFICIENT OF SHIELD TUNNEL BASED ON JOINT EFFECTIVE OPENING

    • The joint seepage is the most common disease of shield tunnel and takes an important impact on the service performance of lining. We propose the assumption of joint effective opening based on the scenario of gasket failure, and then propose the practical calculation formula for the seepage discharge estimation and the equivalent permeability coefficient for the tunnel lining. Taking the conventional shield tunnel common used in the metro line as example, we estimate the seepage discharge of shield tunnel by the proposed practical formula, which was verified by the numerical simulation based on block discrete element method. Taking three different types of shield tunnel as the prototype, furthermore, we calculate the seepage discharge under 135 different conditions. The influences of joint effective opening, external water pressure and lining geometry on the seepage discharge of shield tunnel and the equivalent permeability coefficient of lining are well discussed. It is suggested that the joint effective opening influences the seepage discharge and the equivalent permeability coefficient in a very significant way. The traditional calculation method neglects the influence of joint opening and underestimate the seepage discharge of shield tunnel. The practical calculation formula proposed in this study is readily to handle and can provide some qualitative and quantitative reference for the lining waterproof design as well as the service performance estimation of shield tunnels.
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