Numerical investigation of rock heterogeneity effect on rock dynamic strength and failure process using cohesive fracture model
Numerical investigation of rock heterogeneity effect on rock dynamic strength and failure process using cohesive fracture model
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DOI：
10.1016/j.enggeo.2015.08.028
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发表时间：
2015-10
影响因子：
7.4
通讯作者：
Zhijun Wu;Xu Liang;Quansheng Liu
中科院分区：
文献类型：
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作者：
Zhijun Wu;Xu Liang;Quansheng Liu
在本研究中，开发了一种内聚断裂模型（CFM），该模型假设岩石材料是在其内聚边界处连接在一起的可变形颗粒的组合，用于模拟矿物和水泥特性方面的岩石断裂和破坏行为。为了更好地表示颗粒之间的结构键和岩石材料的异质性，具有随机强度的粘性元素的用户定义材料模型（UMAT）被纳入开发的 CFM 中。首先探讨了所开发模型在静态和动态载荷下处理岩石破裂问题的能力。基于所建立的模型，研究了岩石的非均质性对其动态破坏过程和动态强度的影响。结果表明，所开发的 CFM 可用于研究静态和动态载荷下的岩石破裂问题。岩石材料的非均质性不仅影响岩石的动力破坏过程，而且导致岩石动力强度的增加。
In this study, a cohesive fracture model (CFM), which assumes rock material as assemblage of deformable grains joining together at their cohesive boundaries, is developed to simulate rock fracture and failure behavior in terms of mineral and cement properties. To better represent the structural bonds between the particles and the heterogeneity of rock material, a user-defined material model (UMAT) for the cohesive element with stochastic strengths is incorporated into the developed CFM. The capability of the developed model for rock fracture problems under both static and dynamic loads is first explored. Based on the developed model, the heterogeneity effect of rock on its dynamic failure process and dynamic strength is then studied. The results demonstrate that the developed CFM can be used to investigate the rock fracture problems under both static and dynamic loads. The heterogeneity of rock material not only affects the rock dynamic failure process but also leads to an increase of rock dynamic strength.