A New Rock Brittleness Index Based on the Characteristics of Complete Stress-Strain Behaviors

doi:10.1007/s00603-020-02311-z

	A New Rock Brittleness Index Based on the Characteristics of Complete Stress-Strain Behaviors
	Kuang, Zhihao 2,3; Qiu, Shili 3; Li, Shaojun 3; Du, Shihui 1; Huang, Yong 1; Chen, Xingqiang 1
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2021-01-02
页码	20
关键词	Rock brittleness index Characteristic stress Confining pressure effects Parameter sensitivity analysis Deeply buried tunnel
ISSN号	0723-2632
DOI	10.1007/s00603-020-02311-z
英文摘要	Rock brittleness is an essential mechanical property, which plays a significant role in rock classifications and rockburst risk evaluations. To overcome the problems associated with the traditional brittleness indexes not comprehensively charaterizing the rock strength and deformation behaviors, this study systematically summarized the existing rock brittleness indexes. Then, a novel brittleness index (BICSS) based on the complete stress-strain curves of rock under different confining pressures was proposed. Its advantages included innovatively considering the characteristic stresses and strains at the stage of crack initiation, the peak points, and residual points. The index also described the stress growth rates from the pre-peak crack-initiation stress to the peak stress points, as well as the stress drop rates from the peak stress to the residual stress points. This study conducted uniaxial and triaxial compression tests of metamorphic sandstone, granite, and gneiss obtained from a deeply buried long-line tunnel group. The aforementioned tests were combined with wave velocity tests and thin-section identification tests using polarizing microscopy techniques. The reliability and applicability of the index were then successfully verified. The results showed that the BICSS could not only quantify and classify the brittleness characteristics of different rock types and characterize the confining pressure inhibition behaviors of rock brittleness, but could also comprehensively express the influences of homogeneity, mineral compositions, and particle sizes on the rock brittleness. Finally, through the parameter sensitivity analysis of the BICSS, the influences of subjective errors in the results of the cracking initiation stress and strain values caused by the different selections during the linear elastic phase could be successfully excluded, resulting in the further verification of the stability of the BICSS.
资助项目	National Science Foundation of China[U1765206] ; National Science Foundation of China[41877256] ; Natural Science Basic Research Program of Shaanxi[2020JQ-999] ; Key Research Program of the Chinese Academy of Sciences[KFZD-SW-423]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000604177800005
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/25468]
专题	中科院武汉岩土力学所
通讯作者	Li, Shaojun
作者单位	1.China Railway Frist Survey & Design Inst Grp Co L, Xian 710043, Shaanxi, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech, Wuhan 430071, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Kuang, Zhihao,Qiu, Shili,Li, Shaojun,et al. A New Rock Brittleness Index Based on the Characteristics of Complete Stress-Strain Behaviors[J]. ROCK MECHANICS AND ROCK ENGINEERING,2021:20.
APA	Kuang, Zhihao,Qiu, Shili,Li, Shaojun,Du, Shihui,Huang, Yong,&Chen, Xingqiang.(2021).A New Rock Brittleness Index Based on the Characteristics of Complete Stress-Strain Behaviors.ROCK MECHANICS AND ROCK ENGINEERING,20.
MLA	Kuang, Zhihao,et al."A New Rock Brittleness Index Based on the Characteristics of Complete Stress-Strain Behaviors".ROCK MECHANICS AND ROCK ENGINEERING (2021):20.