水压诱发裂缝拉伸与剪切破裂的理论模型研究

doi:10.13722/j.cnki.jrme.2017.0114

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Abstract The tensile and shear failures of rock subjected to high water pressure were studied with the fracture mechanics. For the tensile failure caused by high water pressure，a method was proposed to calculate the stress intensity factors of two symmetric radial cracks emanating from a pressurized borehole. The fracture initiation criterion under the tensile-shear stress condition and the equations for the critical water pressure and the fracture initiation angle were derived. The influence of the perforation angle and length，the radius of the borehole and the difference of the principal stress on the critical water pressure and fracture initiation angle of two symmetrical cracks were analyzed according to the proposed method. The results show that the theoretical calculated critical water pressure and fracture initiation angle are in good agreement with the experimental results. The parameter analysis indicates that the critical water pressure decreases with the increase of the perforation length and the borehole radius. For the shear failure of rock subjected to high water pressure，the shear fracture criterion of both open and closed cracks under the compression-shear stress state was derived considering the effect of non-singular stress component. Finally，the explicit solution for critical water pressure of shear failure under the condition of compression-shear stress state was proposed.

Key words： rock mechanics hydraulic fracture stress intensity factor mixed fracture critical hydraulic pressure shear fracture criterion

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	Articles by authors
	TANG Shibin1
	LIU Xiangjun2
	LUO Jiang1
	DONG Zhuo1

Cite this article:

TANG Shibin1,LIU Xiangjun2,LUO Jiang1, et al. Theoretical model for tensile and shear crack initiation at the crack tip in rock subjected to hydraulic pressure[J]. , 2017, 36(9): 2124-2135.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0114 OR http://www.rockmech.org/EN/Y2017/V36/I9/2124

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