Evaluation Methodology of Brittleness of Rock Based on Post-Peak Stress-Strain Curves

doi:10.1007/s00603-014-0694-6

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	Evaluation Methodology of Brittleness of Rock Based on Post-Peak Stress-Strain Curves
	Meng, Fanzhen; Zhou, Hui; Zhang, Chuanqing; Xu, Rongchao; Lu, Jingjing
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2015
卷号	48 期号:5 页码:1787-1805
关键词	Brittleness Brittle failure intensity Post-peak stress drop Verification
ISSN号	0723-2632
DOI	10.1007/s00603-014-0694-6
英文摘要	Brittleness is an important characteristic of rocks, for it has a strong influence on the failure process no matter from perspective of facilitating rock breakage or controlling rock failure when rocks are being loaded. Various brittleness criteria have been proposed to describe rock brittleness. In this paper, the existing brittle indices are summarised and then analysed in terms of their applicability to describe rock brittleness. The analysis demonstrates that the widely used strength ratio or product (sigma (c)/sigma (t), sigma (c)center dot sigma (t)) of rocks cannot describe rock brittleness properly and that most of the indices neglect the impact of the rock's stress state on its brittleness. A new evaluation method that includes the degree of brittleness (B (d)) and brittle failure intensity (B (f)) is proposed based on the magnitude and velocity of the post-peak stress drop, which can be easily obtained from the conventional uniaxial and triaxial compression tests. The two indices can accurately account for the influence of the confining pressure on brittleness, and the applicability of the new evaluation method is verified by different experiments. The relationship between B (d) and B (f) is also discussed.
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000360006700004
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/3751]
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn
推荐引用方式 GB/T 7714	Meng, Fanzhen,Zhou, Hui,Zhang, Chuanqing,et al. Evaluation Methodology of Brittleness of Rock Based on Post-Peak Stress-Strain Curves[J]. ROCK MECHANICS AND ROCK ENGINEERING,2015,48(5):1787-1805.
APA	Meng, Fanzhen,Zhou, Hui,Zhang, Chuanqing,Xu, Rongchao,&Lu, Jingjing.(2015).Evaluation Methodology of Brittleness of Rock Based on Post-Peak Stress-Strain Curves.ROCK MECHANICS AND ROCK ENGINEERING,48(5),1787-1805.
MLA	Meng, Fanzhen,et al."Evaluation Methodology of Brittleness of Rock Based on Post-Peak Stress-Strain Curves".ROCK MECHANICS AND ROCK ENGINEERING 48.5(2015):1787-1805.