A two-dimensional coupled hydromechanical discontinuum model for simulating rock hydraulic fracturing
A two-dimensional coupled hydromechanical discontinuum model for simulating rock hydraulic fracturing
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DOI：
10.1002/nag.2314
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发表时间：
2015-04-10
影响因子：
4
通讯作者：
Jiang, Qing-Hui
中科院分区：
文献类型：
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作者：
Jiao, Yu-Yong;Zhang, Huan-Qiang;Jiang, Qing-Hui
在岩石破坏的非连续变形分析算法框架内，建立了一个二维耦合流体力学非连续介质模型，用于模拟岩石水力劈裂过程。该方法基于生成的节理网络，首先进行流体力学计算，得到裂隙尖端附近的渗流压力，然后将渗流压力视为相应块体边界上的线性分布荷载。通过将这些块的分量加入到整体平衡方程的力矩阵中，考虑了液压对裂纹萌生/扩展的贡献。最后，在裂纹尖端处应用失效准则来确定开裂事件的发生。对几个算例进行了数值模拟，结果表明该模型能够正确有效地模拟水力压裂过程。虽然数值和实验验证集中在一个独特的预先存在的裂纹，因为在模拟块状结构的非连续变形分析的能力，所提出的方法是能够模拟岩石水力压裂过程。版权所有（c）2014约翰威利父子有限公司
Within the framework of our discontinuous deformation analysis for rock failure algorithm, this paper presents a two-dimensional coupled hydromechanical discontinuum model for simulating the rock hydraulic fracturing process. In the proposed approach, based on the generated joint network, the calculation of fluid mechanics is performed first to obtain the seepage pressure near the tips of existing cracks, and then the fluid pressure is treated as linearly distributed loads on corresponding block boundaries. The contribution of the hydraulic pressure to the initiation/propagation of the cracks is considered by adding the components of these blocks into the force matrix of the global equilibrium equation. Finally, failure criteria are applied at the crack tips to determine the occurrence of cracking events. Several verification examples are simulated, and the results show that this newly proposed numerical model can simulate the hydraulic fracturing process correctly and effectively. Although the numerical and experimental verifications focus on one unique preexisting crack, because of the capability of discontinuous deformation analysis in simulating block-like structures, the proposed approach is capable of modeling rock hydraulic fracturing processes. Copyright (c) 2014 John Wiley & Sons, Ltd.