Experimental Investigation of the Mechanical Behavior of Bedded Rocks and Its Implication for High Sidewall Caverns

doi:10.1007/s00603-016-1018-9

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	Experimental Investigation of the Mechanical Behavior of Bedded Rocks and Its Implication for High Sidewall Caverns
	Xu, Ding-Ping 1; Zhou, Yang-Yi 1; Feng, Xia-Ting1 ; Fan, Qi-Xiang 2
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2016
卷号	49 期号:9 页码:3643-3669
关键词	Bedded rock Anisotropy Weak plane Tensile strain Confining pressure unloading test Cyclic test True triaxial test Wudongde underground caverns Bedding plane
ISSN号	0723-2632
DOI	10.1007/s00603-016-1018-9
英文摘要	The stability of high sidewalls of large-span underground powerhouses will be a major issue when the cavern axis forms a small angle to the steeply inclined rock strata. A synthetic test scheme composed of four experiments was performed on two rocks with clear bedding features, aiming at better understanding the otherwise confusing deformation behavior and failure patterns of bedded rocks. Bedding orientations with respect to stress direction impose significant effect on the mechanical behavior of bedded rocks. Excessive tensile strain is observed in the direction perpendicular to bedding or across material interface in uniaxial test. Under low confinement in true triaxial test, the sigma (2) angle mainly influences the deformation and fracture propagation but not strength. Deformation dependence of bedded rocks on two stress paths is thoroughly investigated. Confining pressure unloading leads to pronounced volumetric dilation accompanied by moduli drop. Samples with large bedding angle exhibit more obvious lateral dilation. Post-peak degradation of deformation parameters is confirmed by cyclic test. Fractures entirely or partly along bedding occurred under different stress states depend not only on the bonding strength between beds but on the anisotropic deformation field. Based on these observations, it is deduced that the possible reasons for the failure of steeply dipping rock mass after excavation are a combination of (1) the pervasive bedding planes, (2) the more pronounced deformation normal to bedding, and (3) the excavation-induced unloading of confinement.
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000382673200016
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/3921]
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.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hunan, Peoples R China; 2.China Three Gorges Corp
推荐引用方式 GB/T 7714	Xu, Ding-Ping,Zhou, Yang-Yi,Feng, Xia-Ting,et al. Experimental Investigation of the Mechanical Behavior of Bedded Rocks and Its Implication for High Sidewall Caverns[J]. ROCK MECHANICS AND ROCK ENGINEERING,2016,49(9):3643-3669.
APA	Xu, Ding-Ping,Zhou, Yang-Yi,Feng, Xia-Ting,&Fan, Qi-Xiang.(2016).Experimental Investigation of the Mechanical Behavior of Bedded Rocks and Its Implication for High Sidewall Caverns.ROCK MECHANICS AND ROCK ENGINEERING,49(9),3643-3669.
MLA	Xu, Ding-Ping,et al."Experimental Investigation of the Mechanical Behavior of Bedded Rocks and Its Implication for High Sidewall Caverns".ROCK MECHANICS AND ROCK ENGINEERING 49.9(2016):3643-3669.