Fracture mechanism of coplanar double-fracture composite rock under triaxial compression condition

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (21) : 263-276.

SI Yujie1, XIAO Taoli1, YUAN Hao2, ZHE Haicheng1, ZHAO Yunfeng1

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Abstract

In order to study the effects of fracture configuration properties and confining pressure on the failure characteristics of composite rock and the law of fracture expansion in composite rock, based on indoor uniaxial and triaxial compression tests, a triaxial compression particle model of composite rock with coplanar double fractures was established by using PFC2D numerical simulation software, and the failure characteristics and acoustic emission evolution law of composite rock under different fracture inclination, length and confining pressure were studied. The results show that the failure mode of rock samples is mainly controlled by fracture inclination, while the integrity of rock samples is mainly controlled by fracture length and confining pressure. With the increase of crack inclination Angle, the failure mode of rock sample presents the change law of tensile failure → shear failure → tensile-shear combined failure. With the increase of crack length and confining pressure, the fewer macroscopic cracks of rock sample, the better the integrity. The larger the crack inclination is, the more obvious the distribution of micro-cracks in rock samples is. The larger the crack length and confining pressure are, the more obvious the accumulation of micro-cracks is. The damage accumulation of micro-cracks decreases with the increase of crack inclination and length and increases with the increase of confining pressure. The penetration mode of rock bridge is mainly affected by fracture inclination Angle, structural plane and confining pressure. The larger the fracture inclination Angle and confining pressure, the easier the rock bridge is to penetrate. In the process of deformation loading, the overall AE count increases with the increase of crack Angle but decreases with the increase of crack length and confining pressure. The main change of AE count is the value of crack Angle, length and confining pressure.

Key words

coplanar fracture；composite rock；failure pattern； crack propagation； / PFC2D；acoustic emission；

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SI Yujie1, XIAO Taoli1, YUAN Hao2, ZHE Haicheng1, ZHAO Yunfeng1. Fracture mechanism of coplanar double-fracture composite rock under triaxial compression condition[J]. Journal of Vibration and Shock, 2024, 43(21): 263-276

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