等幅循环荷载下页岩的变形特性及能量演化机制研究

doi:10.13722/j.cnki.jrme.2020.0451

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Abstract During the development of shale gas fields，the surrounding rock is always in a three-way high-pressure state. After the completion of hydraulic fracturing，the pressures of the shale gas in the fracture and the fracturing fluid will decrease along with the backflow of the high-pressure fracturing fluid. The shale reservoir suffers long-term cyclic loading in the whole process. In order to explore the mechanical properties of shale under cyclic loading，triaxial variable upper and lower limit constant amplitude cyclic loading and unloading experiments on natural shale were performed under different confining pressures by using the RLW–2000 microcomputer servo rock triaxial testing machine，and the deformation characteristics，energy evolution mechanism and damping characteristics of shale were analyzed. The experimental results show that the deformation modulus and the Poisson¢s ratio fluctuate drastically in the few cycles near failure，indicating that the shale is about to fail. Under variable upper and lower limit constant amplitude cyclic loads，the stress reaching the stage of energy weakening at a low confining pressure is smaller than that at a high confining pressure，while the stress at the energy-strengthening stage does the opposite. The stress ratio can be used as the threshold point for energy conversion and distribution of the specimen to predict the energy strengthening and weakening process in the deformation and failure of the specimen. Finally，the relationship between the cumulative horizontal energy and the stress ratio of shale under variable upper and lower limit constant amplitude cyclic loads was clarified，and the evolution law of the damping ratio with the stress ratio and the number of cycles was revealed.

Key words： rock mechanics shale deformation modulus Poisson¢ s ratio energy damping ratio

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	Articles by authors
	JIANG Changbao1
	2
	WEI Cai1
	2
	ZHUANG Wanjun3
	DUAN Minke2
	4
	CHEN Yufei1
	2
	YU Tang1
	2

Cite this article:

JIANG Changbao1,2,WEI Cai1, et al. Research on deformation characteristics and energy evolution mechanisms of shale under constant amplitude cyclic loading[J]. , 2020, 39(12): 2416-2428.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0451 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I12/2416

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