基于矿物晶体模型的非均质性岩石双裂纹扩展规律研究

doi:10.13722/j.cnki.jrme.2020.0754

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Abstract To study the influence of meso-structural heterogeneity on macroscopic mechanical properties and crack propagation behaviors of fractured rocks，based on laboratory test and mineral composition analysis，the grain based models(GBM) of two types of granites were established using a discrete element numerical code PFC. The reliability and precision of the established GBM were verified against unconfined compression testing results of single flaw rock samples. Unconfined and biaxial compression numerical tests were carried out on double-flaw rock samples，and the stress-strain curve，the failure mode，and the development and evolution of microcracks were analyzed. The results show that intra-grain and inter-grain tensile cracks are primarily cracks and that the development of the cracks can be divided into initial stage，stably developing stage，rapidly developing stage and post peak stage during an entirely loading process. Compared with the unconfined compression，the morphology of crack growth under 10 MPa biaxial compression has two obvious characteristics such as center symmetry and edge extension. At the peak stress，the number of various types of cracks increases with increasing the confining pressure. In contrast，from the perspective of strain-crack number， the confining pressure has different degrees of inhibition effects on the early development of cracks except for inter-grain shear cracks. A rock with a greater heterogeneity coefficient is more prone to stress concentration in the loading process，and the failure mode can more easily transform from tensile failure to shear failure under biaxial compressions.

Key words： rock mechanics heterogeneity grain based model fractured rock crack propagation

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	LI Bo1
	ZHU Qiang1
	ZHANG Fengshou2
	ZHAO Cheng2
	WU Faquan1

Cite this article:

LI Bo1,ZHU Qiang1,ZHANG Fengshou2, et al. Study on crack propagation of heterogeneous rocks with double flaws based on grain based model[J]. , 2021, 40(6): 1119-1131.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0754 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I6/1119

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