基于弹性能演化全过程的岩石脆性评价方法

doi:10.13722/j.cnki.jrme.2019.0778

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Abstract Brittle failure is an important mechanical behavior of rocks，and hence，it is of great significance to establish an accurate brittle evaluation method for rock engineering. Due to that the evolution characteristics of the elastic energy stored in rock before the peak directly determine the property of brittle failure after the peak，in this paper，a brittleness evaluation index based on the whole process of elastic energy evolution was proposed by comprehensively considering the characteristics of pre-peak elastic energy accumulating and post-peak elastic energy releasing. The brittleness evaluation index was used to evaluate the brittleness characteristics of different rocks under uniaxial compression，conventional triaxial compression and hydrostatic pressure conditions. The results show that the brittleness evaluation index established in this paper can fully reflect the brittleness characteristics of rocks. This index can accurately evaluate the difference of brittle characteristics of all kinds of rocks under the condition of uniaxial compression. The accumulating rate of the pre-peak elastic energy and the dissipating rate of the post-peak elastic energy of marble and quartz sandstone decrease with increasing of the confining pressure under the condition of conventional triaxial compression. It is also shown that the brittleness index of quartz sandstone increases with increasing the water pressure and the influence of the water pressure on brittleness index decreases gradually with rising the confining pressure. The rationality of the index was verified by the experimental results. The research work enriches the evaluation method of rock brittleness.

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rock mechanics rock brittleness evaluation energy evolution pre-peak elastic energy accumulating rate ')" href="#">post-peak elastic energy-releasing rate

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	Articles by authors
	CHEN Guoqing1
	WU Jiachen1
	JIANG Wanzeng1
	LI Shaojun2
	QIAO Zhibin3
	YANG Wenbin3

Cite this article:

CHEN Guoqing1,WU Jiachen1,JIANG Wanzeng1, et al. An evaluation method of rock brittleness based on the whole process of elastic energy evolution#br#[J]. , 2020, 39(5): 901-911.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0778 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I5/901

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