Simulation of failure around a circular opening in rock
Simulation of failure around a circular opening in rock
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DOI：
10.1016/s1365-1609(02)00041-2
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发表时间：
2002-06-01
影响因子：
7.2
通讯作者：
Labuz, JF
中科院分区：
文献类型：
--
作者：
Fakhimi, A;Carvalho, F;Labuz, JF
对砂岩试件进行了双轴压缩试验，模拟脆性岩石地下洞室周围的荷载型破坏。在整个破坏过程中监测轴向力和位移，并通过声发射技术检测微裂纹。为了模拟所观察到的开口周围的损伤区，使用离散元计算机程序，粒子流代码（PFC2D）。数值模型由几个圆形元件组成，这些元件可以通过接触刚度相互作用，通过接触键和颗粒摩擦表现出强度，并通过键的断裂产生损伤。为了确定计算机程序校准过程中所需的微观力学参数，仅使用杨氏模量、泊松比和单轴抗压强度等宏观参数。结果表明，PFC2D能够模拟岩石的局部化行为，数值模型能够再现在实验室试验中观察到的损伤区。(C)2002爱思唯尔科技有限公司版权所有。
A biaxial compression test was performed on a sandstone specimen with a circular opening to simulate a loading-type failure around an underground excavation in brittle rock. The axial force and displacements were monitored throughout the failure process, and microcracking was detected by the acoustic emission technique. To model the observed damage zone around the opening, the distinct element computer program, particle flow code (PFC2D), was used. The numerical model consisted of several circular elements that can interact through contact stiffness, exhibit strength through contact bonds and particle friction, and develop damage through fracture of bonds. For the determination of micro-mechanical parameters needed in the calibration process Of the Computer program, only the macroscopic parameters of Young's modulus, Poisson's ratio and uniaxial compressive strength were used. It is shown that PFC2D was capable of simulating the localization behavior of the rock and the numerical model was able to reproduce the damage zone observed in the laboratory test. (C) 2002 Elsevier Science Ltd. All rights reserved.