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Numerical study of excavation induced fractures using an extended rigid block spring method

机译：扩展刚性块弹簧法进行开挖诱发裂缝的数值研究。

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This paper presents a numerical study of fracturing process induced by excavation around a gallery using an extended rigid block spring method (RBSM). The surrounding rock mass is characterized by an assembly of rigid blocks based on a degraded Voronoi diagram. The macroscopic mechanical behavior of rock is related to that of interfaces between blocks. The mechanical behavior of each interface is described by its elastic stiffness and failure criterion. The failure process of interface is controlled by both normal stress and shear stress. Both tensile and shear failures are considered. The macroscopic fracturing process is described by the coalescence of cracked interfaces. The rock structural anisotropy is taken into account through a spatial variation of elastic stiffness and failure strength of interfaces. A series of sensitivity studies are performed to investigate effects of gallery orientation, failure strength of interfaces and rock structural anisotropy on gallery deformation and fracturing. Numerical results are compared with in-situ observations in terms of fracture patterns. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文提出了一种使用扩展的刚性块弹簧法（RBSM）进行的围绕通道开挖引起的压裂过程的数值研究。周围岩体的特征是基于退化的Voronoi图组装刚性块。岩石的宏观力学行为与块之间界面的力学行为有关。每个界面的机械行为均通过其弹性刚度和破坏准则来描述。界面的破坏过程由正应力和剪应力共同控制。同时考虑了拉伸和剪切破坏。宏观破裂过程通过破裂界面的合并来描述。通过弹性刚度和界面破坏强度的空间变化来考虑岩石结构的各向异性。进行了一系列敏感性研究，以研究通道方向，界面破坏强度以及岩石结构各向异性对通道变形和破裂的影响。将数值结果与就裂缝模式而言的原位观察结果进行了比较。 （C）2016 Elsevier Ltd.保留所有权利。

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