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Influence of fault on the surrounding rock stability of a tunnel: Location and thickness

机译：断层对隧道围岩稳定性的影响：位置和厚度

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For an underground tunnel or cavern, the stability of the surrounding rockmass and the safety of the supporting system are predominantly controlled by the fault located near the underground opening, especially during the construction period. In this paper, a series of finite element method (FEM)-based experiments were performed to study the displacements, stresses and plastic zones in the surrounding rockmass and the stresses in the sprayed concrete lining (SCL) in different scenarios, including fault location, fault thickness and the surrounding rockmass quality. To simulate the real behaviour of a-fault, an interface model that can represent the behaviour of a fault in rockmass was introduced, which can reflect such features as the fault's closing, slipping, and opening at different stress states based on the theory of the contact-friction interface (COJO) element. To simulate faults with different thicknesses without remeshing in one FEM mesh, a practical method was established, and a series of formulas for the equivalent parameters of the fault zone is derived based on the equivalent theory on deformation and strength. In the analysis, the location of the fault around the tunnel was defined by arch, shoulder and sidewall. The discrepancy in displacements, stresses and plastic zones in the surrounding rockmass was analyzed on the cases with different fault thickness and locations, as well as the inner forces and stresses in the SCL system. (C) 2016 Elsevier Ltd. All rights reserved.
机译：对于地下隧道或洞穴，尤其是在施工期间，主要由地下开口附近的断层控制周围岩体的稳定性和支撑系统的安全性。本文进行了一系列基于有限元方法（FEM）的实验，研究了在不同情况下（包括断层的位置）周围岩体的位移，应力和塑性区以及喷射混凝土衬砌（SCL）的应力。断层厚度和周围岩体质量。为了模拟断层的真实行为，引入了一个可以代表岩体中断层行为的界面模型，该模型基于断层理论，可以反映断层在不同应力状态下的闭合，滑动和张开等特征。接触摩擦界面（COJO）元素。为了模拟不同厚度的断层而没有在一个有限元网格中重新划分网格，建立了一种实用的方法，并基于等效的变形和强度理论推导了断层带等效参数的一系列公式。在分析中，隧道周围断层的位置由拱，肩和侧壁确定。针对断层厚度和位置不同的情况，以及SCL系统中的内力和应力，分析了围岩中位移，应力和塑性区的差异。 （C）2016 Elsevier Ltd.保留所有权利。

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