花岗岩动态断裂能各向异性试验研究

doi:10.13722/j.cnki.jrme.2016.1588

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Abstract

Due to pre-existing micro-cracks induced by the long-term tectonic loading，rock exhibits strong anisotropy. Using a split Hopkinson pressure bar(SHPB) system with International Society of Rock Mechanics (ISRM) suggested method for dynamic fracture test and the notched semi-circular bend(NSCB) specimen，the anisotropy of dynamic fracture energy of Barre granite and Standstead granite are investigated. The P-wave velocities of two rocks are measured to determine the three principal directions. The notches of the NSCB specimen are made along these three principal directions. Thus for each rock，three groups of NSCB specimens are fabricated. The pulse shaping technique was used to achieve dynamic force balance and a laser gap gauge was utilized to measure the crack surface opening distance(CSOD). Using these methods，the fracture energy for the specimen is determined using energy analysis. For samples in the same orientation group，the dynamic fracture energy of two rocks shows clear loading rate dependence，i.e. the fracture energy increases with the loading rate. The dynamic fracture energy is anisotropic for SG and BG. At the similar loading rate，the dynamic fracture energy for SG and BG along X direction is minimum and the fracture energy along Z direction is maximum. In addition，the fracture energy anisotropy of SG and BG increases with the loading rate. This is attributed to the increase of damage zone around the fracture path under higher loading rates.

Key words： rock mechanics granite mode-I fracture dynamic fracture energy anisotropy

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	Articles by authors
	XU Ying1
	ZHANG Junchen2
	YAO Wei1
	2
	XIA Kaiwen1
	2

Cite this article:

XU Ying1,ZHANG Junchen2,YAO Wei1, et al. Experimental study of dynamic fracture energy anisotropy of granitic rocks[J]. , 2018, 37(S1): 3231-3238.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1588 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3231

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