Tunnel face stability under seepage flow conditions
Tunnel face stability under seepage flow conditions
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DOI：
10.1016/j.tust.2014.03.001
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发表时间：
2014-07-01
影响因子：
6.9
通讯作者：
Anagnostou, G.
中科院分区：
文献类型：
--
作者：
Perazzelli, P.;Leone, T.;Anagnostou, G.
本文基于所谓的“条分法”研究了渗流条件下隧道掌子面的稳定性问题。该计算模型改进了Anagnostou和Kovari（1996年）的极限平衡法，通过将楔形体的平衡与上覆棱柱体的平衡一致处理，即没有对垂直应力分布进行先验假设。此外，研究表明，如果掌子面前方地层中水头梯度较高，楔形体的拉伸破坏可能比剪切破坏更为关键。对于隧道掌子面周围地层中水头的近似分布，我们推导出了所需掌子面支护压力的封闭解。此外，我们还提供了归一化图表，可用于快速评估隧道掌子面的稳定性。© 2014爱思唯尔有限公司。保留所有权利。
The present paper investigates the problem of the stability of the tunnel face under seepage flow conditions based upon the so-called "method of slices". This computational model improves the limit equilibrium method of Anagnostou and Kovari (1996) by treating the equilibrium in the wedge consistently with the overlying prism, i.e. without an a priori assumption concerning the distribution of the vertical stresses. Furthermore, it shows that tensile failure of the wedge may be more critical than shear failure, if the gradient of the hydraulic head in the ground ahead of the face is high. For an approximate distribution of the hydraulic head in the ground around the tunnel face, we derive a closed-form solution for the necessary face support pressure. In addition, we provide normalized diagrams, which allow for a quick assessment of the stability of the tunnel face. (C) 2014 Elsevier Ltd. All rights reserved.