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Complex variable analytical prediction for ground deformation and lining responses due to shield tunneling considering groundwater level variation in clays

机译：考虑粘土中地下水位变化的盾构施工引起的地面变形和衬砌响应的复杂变量分析预测

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摘要

Shield-driven tunneling will encounter huge risk of potential accidents as a consequence of groundwater level surprising variation in the course of construction. Current studies seldom take account of the groundwater level variation during construction for tunneling-induced ground and tunnel responses. Moreover, little work is conducted on the analysis of tunnel lining deformation and stress. For better tunnel serviceability and safety, this paper presents a closed-form analytical solution for predicting the tunneling-induced responses of ground and tunnel lining in clays considering the influence of groundwater level variation. By introducing the non-uniform convergence deformation pattern, along with the conformal mapping, the authors establish sufficiently appropriate boundary conditions for the complex soil properties of different mediums in the problem and the corresponding complex variable solutions are derived. The accuracy of the presented solutions is then verified by comparisons with the numerical solution, showing reasonable alignments. It can also be concluded form the comparisons that the effective stress of soil weight above the tunnel receives a notable increase on the condition of a groundwater drawdown, which inevitably generates ground movements and adversely affects the tunnel safety. Furthermore, parametric analyses are also performed for the influence of concerned parameters on the lining responses, namely, lining thickness, tunnel radius and groundwater level, in which the distribution of lining stress and deformation is described in details. In general, the closed-form analytical approach introduced in this literature provides an effective insight into the soil-lining interaction involving groundwater level variation as a potential risk, which can serve as an alternative approach for conservatively estimating ground and tunnel responses in the preliminary design of tunnels.
机译：由于地下水位在施工过程中会发生令人惊讶的变化，盾构驱动的隧道将面临巨大的潜在事故风险。当前的研究很少考虑隧道施工引起的地面和隧道响应时的地下水位变化。而且，在分析隧道衬砌变形和应力方面所做的工作很少。为了提高隧道的可维护性和安全性，本文提出了一种封闭形式的分析解决方案，该模型可以考虑地下水位变化的影响来预测黏土中地下和隧道衬砌的隧穿诱发响应。通过引入非均匀收敛变形模式，以及共形映射，作者为问题中不同介质的复杂土壤特性建立了足够合适的边界条件，并推导了相应的复杂变量解。然后，通过与数值解进行比较来验证所提出解的准确性，从而显示出合理的对齐方式。通过比较还可以得出结论，在地下水位下降的情况下，隧道上方土壤重量的有效应力会显着增加，这不可避免地会引起地面运动，并对隧道的安全性产生不利影响。此外，还针对相关参数对衬砌响应（即衬砌厚度，隧道半径和地下水位）的影响进行了参数分析，其中详细描述了衬砌应力和变形的分布。一般而言，该文献中介绍的封闭形式分析方法可有效了解土壤-衬层相互作用，其中地下水位变化是潜在风险，可作为初步设计中保守估计地面和隧道响应的另一种方法隧道。

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  • 来源
    《Computers and Geotechnics》 |2020年第4期|103443.1-103443.19|共19页
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  • 作者单位

    Univ Shanghai Sci & Technol Sch Environm & Architecture 516 Jungong Rd Shanghai 200093 Peoples R China|Natl Univ Singapore Dept Civil & Environm Engn Singapore Singapore|Tongji Univ Dept Geotech Engn Shanghai 200092 Peoples R China;

    Natl Univ Singapore Dept Civil & Environm Engn Singapore Singapore;

    Shanghai Univ Dept Civil Engn Shanghai 200444 Peoples R China;

    Tongji Univ Dept Geotech Engn Shanghai 200092 Peoples R China;

    Univ Shanghai Sci & Technol Sch Environm & Architecture 516 Jungong Rd Shanghai 200093 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Shield-driven tunneling; Groundwater level; Ground and tunnel responses; Non-uniform convergence deformation pattern; Complex variable analytical solution;

    机译：盾构驱动隧道;地下水位;地面和隧道响应;非均匀收敛变形模式;复杂变量分析解决方案;

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