A three-dimensional numerical meso-approach to modeling time-independent deformation and fracturing of brittle rocks
A three-dimensional numerical meso-approach to modeling time-independent deformation and fracturing of brittle rocks
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DOI：
10.1016/j.compgeo.2019.103274
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发表时间：
2020
影响因子：
5.3
通讯作者：
G. Zhou;Tao Xu;M. Heap;P. Meredith;T. Mitchell;Ashley Stanton-Yonge Sesnic;Yang Yuan
中科院分区：
文献类型：
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作者：
G. Zhou;Tao Xu;M. Heap;P. Meredith;T. Mitchell;Ashley Stanton-Yonge Sesnic;Yang Yuan
提出了一个新的三维数值细观模型来描述脆性岩石的非时变变形和破裂，该模型考虑了材料的非均匀性和局部材料的退化。在介观尺度上的重整化的概念被引入到捕获的微裂纹的合作相互作用。最大拉应力准则和Drucker-Prager准则（考虑所有三个主应力）分别用于评估拉伸和剪切下的塑性成形元件的损伤。模拟与实验数据一起展示了该模型解决完整岩石破坏过程的能力，重点是微裂纹的萌生和扩展。我们证明，我们的模型是能够模拟变形岩石中的微裂纹的萌生和传播，并捕捉在实验室实验中看到的力学行为，强度和失效模式。因此，我们的三维模型成为一个强大的工具，研究脆性岩石的破坏演化。
A new 3D numerical mesoscale model is proposed to describe the time-independent deformation and fracturing of brittle rocks that accounts for material heterogeneity and local material degradation. The concept of renormalization at the mesoscale was introduced to capture the co-operative interaction of microcracks. The maximum tensile stress criterion and the Drucker-Prager criterion (which considers all three principal stresses) were used to evaluate the damage of specimen-forming elements in tension and shear, respectively. Simulations are presented alongside experimental data to show the capabilities of the model in tackling the failure process of intact rock, with an emphasis on microcrack initiation and propagation. We demonstrate that our model is capable of simulating the initiation and propagation of microcracks in deforming rocks and captures the mechanical behavior, strength, and failure patterns seen in laboratory experiments. Our 3D model therefore emerges as a powerful tool to study the evolution of failure in brittle rocks.