北山深部花岗岩常规三轴压缩条件下的强度参数演化及能量耗散

doi:10.13722/j.cnki.jrme.2021.0071

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Abstract Rock deformation and failure are essentially a damaged evolution process，which includes crack closure，crack development，crack propagation and crack penetration driven by energy. The failure mechanism and complex process can preferably be analyzed from the view of energy dissipation. The conventional triaxial loading tests and acoustic emission characteristics tests on Beishan granite obtained from 550‐560 m depth were conducted to investigate the laws of strength parameter evolution and energy dissipation. Based on the stress-strain curves and acoustic emission characteristics under different confining pressures，a mathematic model describing the relationships of cohesion，internal friction angle and rock property parameters with the damage variable，namely the normalized crack volume strain －，of Beishan deep granite was established. Besides，the energy dissipation confining pressure effect equation during the process of granite fracture was established from the point of energy dissipation. Results show that：(1) the pre-peak diagram of the stress-strain curve can be divided into four different stages including crack compaction，elastic deformation，crack expansion and crack unstable growth，and the characteristic stresses at the boundary points of the stages have a linear relationship with the confining pressure，(2) with increasing the damage variable，the strength parameters c and φ of Mohr-Coulomb criterion and mi of Hoek-Brown criterion increase rapidly，then decrease slowly and finally tend to be stable，(3) there is a corresponding relationship between the AE ringing count rate and the energy cumulative number during the rock compression process，and the high frequency points of the ringing count rate are accompanied by the step growth of the energy cumulative number. The curve of the energy cumulative number can be divided into five stages such as initial stable，first rapid growth，gentle growth，second rapid growth and stable，and (4) with increasing the confining pressure，the eigenvalues of the elastic strain energy gradually increase，while the eigenvalues of the dissipated energy first change steadily，then increase by step growth and finally tend to be stable.

Key words： Rock mechanics Beishan granite triaxial compression strength parameter energy dissipation

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	Articles by authors
	WANG Chuanle1
	DU Guangyin1
	LI Erbing2
	SUN Xue3
	PAN Yue4

Cite this article:

WANG Chuanle1,DU Guangyin1,LI Erbing2, et al. Evolution of strength parameters and energy dissipation of Beishan deep granite under conventional triaxial compression[J]. , 2021, 40(11): 2238-2248.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0071 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I11/2238

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