A computational approach to model dynamic contact and fracture mode transitions in rock
A computational approach to model dynamic contact and fracture mode transitions in rock
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DOI：
10.1016/j.compgeo.2019.01.010
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发表时间：
2019-05
影响因子：
5.3
通讯作者：
R. Abedi;P. Clarke
中科院分区：
文献类型：
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作者：
R. Abedi;P. Clarke
提出了一种基于黎曼解的界面接触断裂模型。代替惩罚方法和拉格朗日乘子法，我们提出了一种基于界面位移和分离速度跳跃的正则化方案，该方案平滑了接触-分离模式的转变。一种基于孔径的正则化方法使水力荷载向原位裂缝的传递变得平滑。采用非连续Galerkin方法求解单轴压缩和爆炸情况下的动态断裂问题。此外，我们还研究了几种水力再压裂问题中的接触-分离模式转变和水力荷载传递，并研究了加载速率和现场裂缝对激活射孔数量和方向的影响。
We propose an interfacial contact and fracture model based on Riemann solutions. Instead of penalty method and Lagrange multiplier approach we propose a regularization scheme—based on the interface displacement and separation velocity jumps—that smoothens contact-separation mode transitions. An aperture-based regularization approach smoothens the transfer of hydraulic load to in-situ cracks. A discontinuous Galerkin implementation is used to solve dynamic fracture problems for uniaxial compression and explosive examples. Moreover, we investigate contact–separation mode transitions and hydraulic load transfer in several hydraulic refracture problems and study the effect of loading rate and in-situ cracks in the number and orientation of activated perforations.