基于平节理模型的花岗岩固有微裂纹对裂纹演化影响分析

doi:10.13722/j.cnki.jrme.2021.0510

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Abstract When simulating the failure of brittle rock，existing studies based on the flat joint model neither consider the nonlinear characteristics of stress-strain curve caused by inherent microcracks，nor take the crack initiation stress，an important indicator of damage evaluation，as the calibration benchmark for micro parameters. Therefore，this study used uniaxial compressive strength，elastic modulus，Poisson's ratio，stress-strain curve characteristics，crack initiation stress，Brazilian splitting tensile strength，Coulomb friction angle and cohesive force as the benchmark to calibrate the micro parameters of the flat joint model for simulating granite failure. The trend relationships between the macro mechanical behaviors and micro parameters were analyzed. The calibrated parameters were used to establish an accurate flat joint model sample，which was compared with a conventional flat joint model sample that does not consider inherent microcracks. Numerical tests of fractured rock compression were carried out. Based on the strain field obtained by the digital image correlation method of the indoor test，the initiation，quantity and distribution characteristics of tensile/shear microcracks were analyzed to verify the calibration process of the flat joint model proposed in this paper. The results show that inherent microcracks influence the characteristics of the stress-strain curve at the macro level，and have a great impact on the crack initiation mode at the tip of the prefabricated flaw and the propagation and distribution law of tensile-shear microcracks at the meso level.

Key words： rock mechanics granite flat joint model parameter calibration crack development inherent microcracks

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	Articles by authors
	ZHANG Rui1
	ZHAO Cheng1
	2
	XING Jinquan1
	PAN Haoyu1

Cite this article:

ZHANG Rui1,ZHAO Cheng1,2, et al. Influence of granite inherent microcracks on crack evolution based on the flat-joint contact model[J]. , 2021, 40(9): 1857-1867.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0510 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I9/1857

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