Simulation of Fracture Coalescence in Granite via the Combined Finite–Discrete Element Method
Simulation of Fracture Coalescence in Granite via the Combined Finite–Discrete Element Method
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DOI：
10.1007/s00603-019-01773-0
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发表时间：
2018-05
影响因子：
6.2
通讯作者：
B. Euser;E. Rougier;Z. Lei;E. Knight;L. Frash;J. Carey;H. Viswanathan-;A. Munjiza
中科院分区：
文献类型：
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作者：
B. Euser;E. Rougier;Z. Lei;E. Knight;L. Frash;J. Carey;H. Viswanathan-;A. Munjiza
裂缝聚结是由小裂缝形成大裂缝的关键现象，影响裂缝网络流动和地震能量释放潜力。在本文中，进行了模拟，以模拟裂缝合并过程在花岗岩样品中预先存在的缺陷。这些模拟利用了内部实现的有限-离散元组合方法（FDEM），即混合优化软件套件（HOSS）。试样内部存在的缺陷具有两种几何形态：(1)单个缺陷与加载方向呈不同角度取向；(2)两个缺陷，其中初级缺陷垂直于加载方向，次级缺陷呈不同角度取向。模拟提供了对拉伸和剪切断裂行为随时间变化的深入了解。单缺陷模拟准确地再现了实验测量的峰值应力作为缺陷倾角的函数。单缺陷和双缺陷的强度随缺陷角度的增加呈线性增长，双缺陷的强度比单缺陷的弱。
Fracture coalescence is a critical phenomenon for creating large, inter-connected fractures from smaller cracks, affecting fracture network flow and seismic energy release potential. In this paper, simulations are performed to model fracture coalescence processes in granite specimens with pre-existing flaws. These simulations utilize an in-house implementation of the combined finite–discrete element method (FDEM) known as the hybrid optimization software suite (HOSS). The pre-existing flaws within the specimens follow two geometric patterns: (1) a single-flaw oriented at different angles with respect to the loading direction, and (2) two flaws, where the primary flaw is oriented perpendicular to the loading direction and the secondary flaw is oriented at different angles. The simulations provide insight into the evolution of tensile and shear fracture behavior as a function of time. The single-flaw simulations accurately reproduce experimentally measured peak stresses as a function of flaw inclination angle. Both the single- and double-flaw simulations exhibit a linear increase in strength with increasing flaw angle while the double-flaw specimens are systematically weaker than the single-flaw specimens.