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Numerical Simulation of Cracking Process in Rock Mass Under the Coupled Thermo-Mechanical Condition
International Journal of Computational Methods ( IF 1.7 ) Pub Date : 2019-07-17 , DOI: 10.1142/s0219876219500658
Xuewei Liu 1, 2 , Quansheng Liu 3 , Jun He 4 , Fangzheng Yu 3
Affiliation  

To investigate crack initiation and propagation of rock mass under coupled thermo-mechanical (TM) condition, a two-dimensional coupled TM model based on the numerical manifold method (NMM) is proposed, considering the effect of thermal damage on the rock physical properties and stress on the heat conductivity. Then, the NMM, using empirical strength criteria as the crack propagation critical criterion and physical cover as the minimum failure element, was extended for cracking process simulation. Furthermore, a high-order cover function was used to improve the calculation accuracy of stress. Therefore, the proposed method consists of three parts and has a high accuracy for simulating the cracking process in the rock mass under the coupled TM condition. The ability of the proposed model for high accuracy stress, crack propagation, and thermally-induced cracking simulation was verified by three examples. Finally, the proposed method was applied to simulate the stability of a hypothetical nuclear waste repository. Based on the outcome of this study, the application of NMM can be extended to study rock failure induced by multi-field coupling effect in geo-materials.

中文翻译:

热力耦合条件下岩体开裂过程的数值模拟

为研究热力耦合(TM)条件下岩体裂纹的萌生和扩展,考虑到热损伤对岩石物理性质的影响,提出了一种基于数值流形法(NMM)的二维耦合TM模型。热导率的应力。然后,使用经验强度准则作为裂纹扩展临界准则,将物理覆盖层作为最小失效元素,将 NMM 扩展用于裂纹过程模拟。此外,还采用了高阶覆盖函数来提高应力的计算精度。因此,该方法由三部分组成,对于模拟耦合TM条件下岩体开裂过程具有较高的精度。所提出的模型对高精度应力、裂纹扩展的能力,并通过三个实例验证了热致开裂模拟。最后,将所提出的方法应用于模拟假设的核废料储存库的稳定性。基于本研究的结果,NMM的应用可以扩展到研究地质材料中多场耦合效应引起的岩石破坏。
更新日期:2019-07-17
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