关振长,缑小东,王涛,等. 2021. 基于拼缝有效开度的盾构隧道渗流量及衬砌等效渗透系数计算[J]. 工程地质学报,29(1):256-263. doi:10.13544/j.cnki.jeg.2019-538. DOI: 10.13544/j.cnki.jeg.2019-538
    引用本文: 关振长,缑小东,王涛,等. 2021. 基于拼缝有效开度的盾构隧道渗流量及衬砌等效渗透系数计算[J]. 工程地质学报,29(1):256-263. doi:10.13544/j.cnki.jeg.2019-538. DOI: 10.13544/j.cnki.jeg.2019-538
    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.

    基于拼缝有效开度的盾构隧道渗流量及衬砌等效渗透系数计算

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

    • 摘要: 拼缝渗漏水是盾构隧道最常见的病害表现形式,对衬砌的服役性能有重要影响。在前人研究成果的基础上,提出基于防水密封垫失效的拼缝有效开度假定,进而推导出基于拼缝有效开度的盾构隧道渗流量及衬砌等效渗透系数的实用计算公式。以国内较为通用的常规断面盾构隧道为例,利用上述实用公式估算其渗流量,并与基于块体离散元的数值模拟结果相互验证。再以3种不同几何形态的盾构隧道为原型,完成了135种不同工况下的渗流计算,探讨了有效开度、衬砌外水压及衬砌几何形态,对盾构隧道渗流量及衬砌等效渗透系数的影响。结果表明:拼缝有效开度对渗流量及等效渗透系数的影响十分显著,未考虑拼缝间密封垫失效的传统计算方法可能高估了盾构隧道衬砌的防水性能。本文所述实用计算公式,具有表达清晰、计算简便的特点,可为盾构隧道衬砌的防水设计及后续服役性能评价提供定性和定量的参考。

       

      Abstract: 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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