Mechanism of Structural-Slip Rockbursts in Civil Tunnels: An Experimental Investigation

doi:10.1007/s00603-021-02429-8

	Mechanism of Structural-Slip Rockbursts in Civil Tunnels: An Experimental Investigation
	Li, Yuzong 1,4; Su, Guoshao 3; Pang, Jianyong 1,4; Liu, Caihua 2; Zhang, Qinghe 1,4; Yang, Xiaofeng 1,4
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2021-03-13
页码	28
关键词	Structural– slip rockbursts Stress drop Shear tests Granite Stick– slip
ISSN号	0723-2632
DOI	10.1007/s00603-021-02429-8
英文摘要	Structural-slip rockbursts are frequently faced in civil tunnels, which pose huge threats to the safety of personnel and equipment in tunnels. In this study, the core features of structural-slip rockbursts were summarized qualitatively based on the many structural-slip rockburst cases encountered in civil tunnels. Direct shear tests on splitting granite joints were performed to reproduce structural-slip rockbursts in the laboratory, and stress-deformation relationship, sound waves, acoustic emissions (AEs), ejected fragments and failure characteristics of the structural planes were investigated to comprehensively make clear the mechanisms of structural-slip rockbursts. Two generation modes of structural-slip rockbursts were revealed in the experiments. One occurs in the early stage of structural plane slip and shows stress drops resulted from the brittle rupture of asperities on structural surfaces, and the other is that a part of ruptured asperities are gradually pulverized into powder shapes and the powdery debris impels the movement mode of structural planes suddenly from sliding friction to rolling friction, which lead to sudden stress drops and cause the rockbursts. Further, the normal stress effect on the rockburst intensity was discussed. It was found that the larger the normal stress, the greater the intensity of rockbursts. Moreover, the characteristics of rockburst intensities in the tests were analyzed by means of the sound waveforms, and it was induced that the rockburst intensity presents alternating circulation laws. The findings from this study may be valuable for understanding the structural-slip mechanism in civil tunnels.
资助项目	Systematic Project of Guangxi Key Laboratory of Disaster Prevention and Structural Safety (Guangxi University)[2019ZDK009] ; University Natural Science Research Project of Anhui Province, China[KJ2020A0298]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000628480300003
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/25986]
专题	中科院武汉岩土力学所
通讯作者	Su, Guoshao
作者单位	1.Anhui Univ Sci & Technol, Sch Civil Engn & Architecture, Huainan 232001, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomechan & Geotech Engn, Wuhan 430071, Peoples R China 3.Guangxi Univ, Guangxi Key Lab Disaster Prevent & Engn Safety, Nanning 530004, Peoples R China 4.Anhui Univ Sci & Technol, State Key Lab Min Response & Disaster Prevent & C, Huainan 232001, Peoples R China
推荐引用方式 GB/T 7714	Li, Yuzong,Su, Guoshao,Pang, Jianyong,et al. Mechanism of Structural-Slip Rockbursts in Civil Tunnels: An Experimental Investigation[J]. ROCK MECHANICS AND ROCK ENGINEERING,2021:28.
APA	Li, Yuzong,Su, Guoshao,Pang, Jianyong,Liu, Caihua,Zhang, Qinghe,&Yang, Xiaofeng.(2021).Mechanism of Structural-Slip Rockbursts in Civil Tunnels: An Experimental Investigation.ROCK MECHANICS AND ROCK ENGINEERING,28.
MLA	Li, Yuzong,et al."Mechanism of Structural-Slip Rockbursts in Civil Tunnels: An Experimental Investigation".ROCK MECHANICS AND ROCK ENGINEERING (2021):28.