循环荷载下北山花岗岩能量耗散与损伤特征

doi:10.13722/j.cnki.jrme.2020.0953

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Abstract Taking granite in Beishan of Gansu province as the research object，triaxial cyclic loading and unloading tests were carried out. The evolution characteristics of energy dissipation，friction energy dissipation and breakage energy dissipation of rock under cyclic loading and unloading were explored，and a rock damage variable based on breakage energy dissipation was proposed. The results show that，based on the characteristics of the energy dissipation ratio curve and the stress-strain curve，the cyclic loading and unloading process can be divided into five stages such as the compaction and elastic stage，the stable crack development stage，the unstable crack development stage，the post-peak unstable fracture stage and the residual strength stage. Correspondingly，the energy dissipation ratio shows a “spoon” shape evolution of slight decline，stable development，slow increase，significant increase and a stable trend. Meanwhile，the friction energy dissipation ratio decreases slightly in the compaction and elastic stage，remains at a low level in the stable crack development stage and the unstable crack development stage，increases significantly in the post-peak unstable fracture stage and stabilizes in the residual strength stage. Furthermore，the breakage energy dissipation ratio increases slightly before the peak， increases abruptly at the initial part of the post-peak unstable fracture stage and then rapidly declines，and finally stabilizes at a lower level. The damage variable defined in terms of breakage energy dissipation can reasonably describe the damage evolution of granite under cyclic loading and unloading.

Key words： rock mechanics cyclic loading and unloading energy dissipation damage variable

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	Articles by authors
	MIAO Shengjun1
	2
	LIU Zejing1
	2
	ZHAO Xingguang3
	HUANG Zhengjun1
	2

Cite this article:

MIAO Shengjun1,2,LIU Zejing1, et al. Energy dissipation and damage characteristics of Beishan granite under cyclic loading and unloading[J]. , 2021, 40(5): 928-938.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0953 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I5/928

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