Face stability of slurry-driven shield with permeable filter cake
Face stability of slurry-driven shield with permeable filter cake
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DOI：
10.1016/j.tust.2021.103841
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发表时间：
2021-02-05
影响因子：
6.9
通讯作者：
Mooney, Michael
中科院分区：
文献类型：
--
作者：
Yin, Xinsheng;Chen, Renpeng;Mooney, Michael
隧道掌子面滤饼的水力阻力是影响泥水盾构隧道稳定性的重要因素。然而，滤饼的影响还没有得到很好的理解。本文通过渗流柱试验研究了隧道掌子面滤饼的动态和周期性特征。建立了含可渗透滤饼的桑迪三维渗流数学模型，计算了渗透力，并提出了基于极限平衡分析的极限超压计算方法。研究了滤饼导水系数对超压极限的影响。我们的研究结果表明，极限超压增加的滤饼的水力传导率的增加，也表明，极限超压，使用目前的方法在文献中计算时，被低估。
The hydraulic resistance of the filter cake on a tunnel face is an important factor in the stability of slurry-driven shield tunnels. However, the effect of the filter cake is not well understood. The study presented in this paper explores the dynamic and periodic features of the filter cake on the tunnel face through infiltration column tests. A three-dimensional numerical model with a permeable filter cake was developed to investigate the hydraulic head field in sandy soil from which the seepage forces were computed as well as a new calculation approach for the limit excess pressure based on a limit equilibrium analysis. The influences of the hydraulic conductivity of the filter cake on the limit excess pressure were also studied. Our results show that the limit excess pressure increased with an increase in the hydraulic conductivity of the filter cake and also show that the limit excess pressure, when calculated using the current approaches in the literature, was underestimated.