Morphological features and fractography analysis for in situ spalling in the China Jinping underground laboratory with a 2400 m burial depth

doi:10.1016/j.tust.2021.104194

	Morphological features and fractography analysis for in situ spalling in the China Jinping underground laboratory with a 2400 m burial depth
	Jiang, Quan 2; Yang, Bing 1,2; Yan, Fei 2; Xu, Dingping 2; Feng, Guangliang 2; Li, Shaojun 2
刊名	TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
	2021-12-01
卷号	118 页码:16
关键词	Underground engineering Rock spalling Surface morphology Branching criterion Roughness anisotropy
ISSN号	0886-7798
DOI	10.1016/j.tust.2021.104194
英文摘要	Brittle spalling of hard rock is a typical failure in deep underground engineering that induces challenges for construction safety. Seventy marble spalling samples were collected from the China Jinping Underground Laboratory Phase-II (CJPL-II) to analyse their mesoscopic morphology and failure mechanism. The 3D scanning and corresponding statistical analysis indicated that the spalling surfaces were not smooth but with low roughness and evident anisotropy, and that the morphological transition (i.e. from the mirror zone to the mist zone then to the hackle zone) on the spalling surface was observed. The fractography of the CJPL-II spalling samples showed typical features of brittle fracture dominated by the granular morphology of intergranular fracture based on the Scanning Electron Microscope technology. What's more, the simulated spalling by the laboratorial true triaxial unloading tests showed similar morphology with that of CJPL-II spalling. Moreover, by comparing the marble spalling samples with other granite spalling and basalt sapling samples, the effect of the mineral particle size of the surrounding rock on the roughness of the spalling slice was discussed. This study deepens the understanding of the in-situ spalling mechanism of hard rock under high geostress conditions.
资助项目	National Natural Science Foundation of China[U1965205] ; National Natural Science Foundation of China[51779251] ; Hubei Province Outstanding Youth Fund[2017CFA060]
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:000706183000002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28518]
专题	中科院武汉岩土力学所
通讯作者	Yan, Fei
作者单位	1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Quan,Yang, Bing,Yan, Fei,et al. Morphological features and fractography analysis for in situ spalling in the China Jinping underground laboratory with a 2400 m burial depth[J]. TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,2021,118:16.
APA	Jiang, Quan,Yang, Bing,Yan, Fei,Xu, Dingping,Feng, Guangliang,&Li, Shaojun.(2021).Morphological features and fractography analysis for in situ spalling in the China Jinping underground laboratory with a 2400 m burial depth.TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,118,16.
MLA	Jiang, Quan,et al."Morphological features and fractography analysis for in situ spalling in the China Jinping underground laboratory with a 2400 m burial depth".TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 118(2021):16.