微裂隙对花岗岩力学性质影响的阈值研究

doi:10.13722/j.cnki.jrme.2017.1324

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Abstract To obtain the relationship between microcracks and mechanical properties，slice identification and mechanical test were carried out，in which the samples were from Bayannuorigong granite mass in Alxa pre-selected region for geological disposal of high-level nuclear waste. Firstly，the microcracks are quantified by area crack linear density. Uniaxial compression tests for standard cylindrical granite samples were conducted using electro-hydraulic servo testing machine. The mechanical parameters of granite were obtained from complete stress-strain curves under uniaxial compression. The relationship between area crack linear density and mechanical parameters was researched. The results show that there is a threshold about the effect of microcracks on granite uniaxial compressive strength and deformation modulus. When the microcrack linear density is greater than the threshold，it has a good correlation with uniaxial compressive strength and deformation modulus. Otherwise，their correlation is very poor，and the effect of microcracks linear density on the mechanical properties of rocks is not obvious.

Key words： rock mechanics granite microcrack mechanical property threshold

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	Articles by authors
	YUAN Guangxiang1
	WANG Pengjiao2
	ZHANG Luqing3
	ZENG Qingli3
	HUANG Zhiquan1
	SHANG Yanjun3
	4
	WANG Hongjian1

Cite this article:

YUAN Guangxiang1,WANG Pengjiao2,ZHANG Luqing3, et al. The thresholds about effect of microcrack on mechanical properties for granite[J]. , 2019, 38(S1): 2646-2653.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1324 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2646

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