In Situ Observation of Failure Mechanisms Controlled by Rock Masses with Weak Interlayer Zones in Large Underground Cavern Excavations Under High Geostress

doi:10.1007/s00603-017-1249-4

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	In Situ Observation of Failure Mechanisms Controlled by Rock Masses with Weak Interlayer Zones in Large Underground Cavern Excavations Under High Geostress
	Fan, Yi-Lin 3; Duan, Shu-Qian 2; Feng, Xia-Ting1,2 ; Jiang, Quan 2; Liu, Guo-Feng 2; Pei, Shu-Feng 2
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2017
卷号	50 期号:9 页码:2465-2493
关键词	Weak interlayer zone (WIZ) Large underground cavern High geostress In situ observation Mechanism Failure process
ISSN号	0723-2632
DOI	10.1007/s00603-017-1249-4
英文摘要	A weak interlayer zone (WIZ) is a poor rock mass system with loose structure, weak mechanical properties, variable thickness, random distribution, strong extension, and high risk due to the shear motion of rock masses under the action of tectonism, bringing many stability problems and geological hazards, especially representing a potential threat to the overall stability of rock masses with WIZs in large underground cavern excavations. Focusing on the deformation and failure problems encountered in the process of excavation unloading, this research proposes comprehensive in situ observation schemes for rock masses with WIZs in large underground cavern on the basis of the collection of geological, construction, monitoring, and testing data. The schemes have been fully applied in two valuable project cases of an underground cavern group under construction in the southwest of China, including the plastic squeezing-out tensile failure and the structural stress-induced collapse of rock masses with WIZs. In this way, the development of rock mass failure, affected by the step-by-step excavations along the cavern's axis and the subsequent excavation downward, could be observed thoroughly. Furthermore, this paper reveals the preliminary analyses of failure mechanism of rock masses with WIZs from several aspects, including rock mass structure, strength, high stress, ground water effects, and microfracture mechanisms. Finally, the failure particularities of rock masses with WIZs and rethink on prevention and control of failures are discussed. The research results could provide important guiding reference value for stability analysis, as well as for rethinking the excavation and support optimization of rock masses with WIZs in similar large underground cavern under high geostress.
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000408918600013
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4133]
专题	岩土力学所知识全产出_期刊论文岩土力学所知识全产出国家重点实验室知识产出_期刊论文
作者单位	1.Northeastern Univ, Key Lab, Minist Educ Safe Min Deep Met Mines ; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 3.China Three Gorges Corp
推荐引用方式 GB/T 7714	Fan, Yi-Lin,Duan, Shu-Qian,Feng, Xia-Ting,et al. In Situ Observation of Failure Mechanisms Controlled by Rock Masses with Weak Interlayer Zones in Large Underground Cavern Excavations Under High Geostress[J]. ROCK MECHANICS AND ROCK ENGINEERING,2017,50(9):2465-2493.
APA	Fan, Yi-Lin,Duan, Shu-Qian,Feng, Xia-Ting,Jiang, Quan,Liu, Guo-Feng,&Pei, Shu-Feng.(2017).In Situ Observation of Failure Mechanisms Controlled by Rock Masses with Weak Interlayer Zones in Large Underground Cavern Excavations Under High Geostress.ROCK MECHANICS AND ROCK ENGINEERING,50(9),2465-2493.
MLA	Fan, Yi-Lin,et al."In Situ Observation of Failure Mechanisms Controlled by Rock Masses with Weak Interlayer Zones in Large Underground Cavern Excavations Under High Geostress".ROCK MECHANICS AND ROCK ENGINEERING 50.9(2017):2465-2493.