Real-time monitoring of the development of brittle fracture in hard rock tunnels based on physical model test

doi:10.1016/j.tust.2021.104240

	Real-time monitoring of the development of brittle fracture in hard rock tunnels based on physical model test
	Zhu, Guo-Qiang 2,3; Feng, Xia-Ting 2; Pan, Peng-Zhi 1,2; Zhou, Yang-Yi 2; Yang, Cheng-Xiang 2; Li, Zheng-Wei 2; Taiwakuli, Yusufu 2
刊名	TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
	2022
卷号	119 页码:11
关键词	Physical model test Hard rock tunnel Similarity theories V-Shaped brittle fracture Crack evolution Elasto-plastic cellular automaton Spalling
ISSN号	0886-7798
DOI	10.1016/j.tust.2021.104240
英文摘要	Brittle fracture in deep hard rock tunnels in the Jinping laboratory, China, can often endanger the stability of engineering structures. This study describes physical model testing and real-time observations on the evolution process of v-shaped brittle fracture, failure characteristics, onset conditions, and influencing factors in hard rock tunnels. Real-time observations are presented integrated a high-speed camera, acoustic emission system, a digital image correlation, and distributed fiber optic strain sensing technologies. The results show that the process of spalling failure can be divided into two main stages, namely, the instantaneous cracking process in the sidewall surface, and the spalling process of the thin rock chips developing progressively from the excavation boundary to the far field, finally forming stable v-shaped notches. The deviatoric stress of spalling failure in the physical model test satisfies the constant deviatoric stress criterion. The critical strain at spalling failure is consistent with that calculated by the Hoek-Brown strength criterion. Spalling is a form of brittle failure caused by deferential tensile strain. The working face effect is observed in the physical model excavation process. The highest strain caused by overloading occurs near the free surface of the sidewall. The relationship between stress and geometric similarity constants in deep rock engineering is derived. The failure characteristics revealed in the physical model tests are verified by numerical simulations based on cellular automaton theory, which agree well with the experimental results. The research findings can provide theoretical support for the prevention and control of spalling disasters in deep engineering practice.
资助项目	National Natural Science Foundation of China[51621006] ; National Natural Science Foundation of China[51839003] ; Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines
WOS研究方向	Construction & Building Technology ; Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000714806600003
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28348]
专题	中科院武汉岩土力学所
通讯作者	Feng, Xia-Ting
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Northeastern Univ, Key Lab, Minist Educ Safe Min Deep Met Mines, Shenyang 110819, Peoples R China 3.China Univ Geosci, Three Gorges Res Ctr Geohazards, Minist Educ, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Guo-Qiang,Feng, Xia-Ting,Pan, Peng-Zhi,et al. Real-time monitoring of the development of brittle fracture in hard rock tunnels based on physical model test[J]. TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,2022,119:11.
APA	Zhu, Guo-Qiang.,Feng, Xia-Ting.,Pan, Peng-Zhi.,Zhou, Yang-Yi.,Yang, Cheng-Xiang.,...&Taiwakuli, Yusufu.(2022).Real-time monitoring of the development of brittle fracture in hard rock tunnels based on physical model test.TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,119,11.
MLA	Zhu, Guo-Qiang,et al."Real-time monitoring of the development of brittle fracture in hard rock tunnels based on physical model test".TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 119(2022):11.