基于CT-GBM重构法的花岗岩裂纹扩展规律研究

doi:10.13722/j.cnki.jrme.2021.0837

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Abstract To study the crack propagation law of granite subject to unconfined compression at grain scale，a CT-GBM(Computed Tomography-Grain Based Model) method，combining the high-precision CT scanning technology and particle flow numerical simulation，was developed. This method can help to establish two-dimensional GBM model based on real mineral crystal structures. Mesoscopic mechanical parameters involved in the contact model were calibrated according to the results obtained from the unconfined compression tests. The cracking propagation law of granite mineral crystals was explored based on the calibrated model. The results show that the CT-GBM modeling method can effectively reproduce the hard and brittle mechanical properties and splitting failure mode of granite. The cracking process mainly includes four stages：crack-free stage，crack initiation stage，stable cracking stage and unstable cracking stage. The order of microcrack initiation is as follows：intergranular tensile crack，intergranular shear crack，intragranular tensile crack and intragranular shear crack，and the intergranular tensile cracks predominate. From the aspect of mineral type，the cracks first initiate inside the feldspar mineral，followed by quartz and mica，and the areas where microcracks converge and nucleate are dominated by mica and feldspar minerals.

Key words： rock mechanics CT GBM uniaxial compression test crack propagation discrete element simulation

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	Articles by authors
	LI Bo1
	2
	LIANG Qinyuan2
	ZHOU Yu2
	ZHAO Cheng1
	WU Faquan2

Cite this article:

LI Bo1,2,LIANG Qinyuan2, et al. Research on crack propagation law of granite based on CT-GBM reconstruction method[J]. , 2022, 41(6): 1114-1125.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0837 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I6/1114

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