基于全应力–应变曲线及起裂应力的岩石脆性特征评价方法

doi:10.13722/j.cnki.jrme.2017.0499

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Abstract Brittleness is an important index of rock and evaluating the brittleness accurately is of great significance in rock engineering. At present，the commonly used method to evaluate the brittleness index of rock is based on the variation of the stress strain curve in compression process，and less attention is paid to the pre-stress state. In this paper，the rate of stress drop in the post-peak state and the rate of stress increase from crack initiation to stress peak are comprehensively considered. A new method for calculating the brittleness index more accurately and reasonably based on the whole process of stress and strain of rock mass is established. It is difficult to obtain the post peak curve accurately for strong brittle rock in displacement controlled uniaxial loading tests，which affects the accuracy of the conventional method based on the post peak stress curve. The brittleness index established in this paper is according to the stress-strain curve before stress peak. Under the condition of triaxial compression，the brittle index proposed reflects the inhibitory effect of confining pressure on the brittleness of marble more comprehensively. The brittleness index established in this paper is based on the stress state of the whole compression process and reflects the effect of different factors on rock brittleness. The accuracy and superiority of this index are verified with the experimental results.

Key words： rock mechanics brittleness index complete stress-strain curve crack initiation stress

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	Articles by authors
	CHEN Guoqing
	ZHAO Cong
	WEI Tao
	WANG Jianchao

Cite this article:

CHEN Guoqing,ZHAO Cong,WEI Tao, et al. Evaluation method of brittle characteristics of rock based on full stress-strain curve and crack initiation stress[J]. , 2018, 37(1): 51-59.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0499 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I1/51

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