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首页> 外文期刊>Проблемы прочностиПроблемы прочности: на рус．укр．и анг．языках >Experimental and Numerical Simulation of the Microcrack Coalescence Mechanism in Rock-Like Materials
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Experimental and Numerical Simulation of the Microcrack Coalescence Mechanism in Rock-Like Materials

机译：类岩石材料中微裂纹聚结机理的实验与数值模拟

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摘要

Rocks and rock-like materials frequently fail under compression due to the initiation, propagation and coalescence of the pre-existing microcracks. The mechanism of microcrack coalescence process in rock-like materials is experimentally and numerically investigated. The experimental study involves some uniaxial compression tests on rock-like specimens specially prepared from portland pozzolana cement, mica sheets and water. The microcrack coalescence is studied by scanning electron microscopy on some of the prepared thin samples. It is assumed that the mica sheets play the role of microcracks within the specimens. Some analytical and numerical studies are also carried out to simulate the experimentally observed microcracks coalescence phenomena within the specimens. A higher-order indirect boundary element method known as higher-order displacement discontinuity method implementing special crack tip elements to treat the singularities of stress and displacement fields near the crack ends is used to estimate the Mode I and Mode II stress intensity factors at the microcracks tips. The maximum tangential stress fracture criterion is implemented in a sophisticated computer code using the linear elastic fracture mechanics theory and the propagation and coalescence of random microcracks within the rock-like samples are numerically simulated based on an iterative algorithm. The proposed analyses are validated by comparing the corresponding experimental and numerical results of microcrack coalescence phenomena of rock-like materials.
机译：由于预先存在的微裂纹的发生，传播和合并，岩石和类岩石材料经常在压缩作用下失效。对岩石类材料中微裂纹聚结过程的机理进行了实验和数值研究。实验研究包括对由波特兰火山灰水泥，云母片和水制成的岩石样标本进行一些单轴压缩试验。通过扫描电子显微镜对一些制备的薄样品进行了微裂纹聚结的研究。假定云母片在样品中起微裂纹的作用。还进行了一些分析和数值研究，以模拟实验观察到的试样内部的微裂纹合并现象。使用高阶间接边界元法（称为高阶位移不连续法），该方法采用特殊的裂纹尖端元件来处理裂纹末端附近的应力和位移场的奇异性，用于估算微裂纹处的模式I和模式II应力强度因子提示。最大切向应力断裂准则是使用线性弹性断裂力学理论在复杂的计算机代码中实现的，并且基于迭代算法对岩石样内部随机微裂纹的传播和合并进行了数值模拟。通过比较岩石状材料微裂纹聚结现象的相应实验和数值结果，验证了所提出的分析结果。

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