Effects of Karst Cave Shape on the Stability and Minimum Safety Thickness of Tunnel Surrounding Rock

doi:10.1061/(ASCE)GM.1943-5622.0002054

	Effects of Karst Cave Shape on the Stability and Minimum Safety Thickness of Tunnel Surrounding Rock
	Zhang, L. W.1; Fu, H.1; Wu, J.1,2; Zhang, X. Y.1; Zhao, D. K.1
刊名	INTERNATIONAL JOURNAL OF GEOMECHANICS
	2021-09-01
卷号	21 期号:9 页码:15
关键词	Karst tunnel Height-span ratio Numerical simulation Stability of surrounding rock Minimum safety thickness
ISSN号	1532-3641
DOI	10.1061/(ASCE)GM.1943-5622.0002054
英文摘要	Karst caves are often encountered during karst tunnel excavation, and the shape of the karst cave has an impact on the stability of the tunnel surrounding rock. This paper focused on the effects of karst cave shape on the stability and minimum safety thickness of tunnel surrounding rock. First, the 3D water-filled karst cave and tunnel models were established, and the tunnel excavation simulation under the different height-span ratios of the karst cave was carried out. Second, the stress and displacement fields of the surrounding rock were analyzed, and the change laws of stress and displacement with tunnel excavation were revealed. Third, on the basis of simulation results, the formulas for the minimum safety thickness of surrounding rock resisting water inrush were derived based on the catastrophe theory and strength theory. Finally, the numerical simulation and theoretical formulas were verified by contrastive analysis of the specific engineering project. The results showed that (1) as the height-span ratio of the top karst cave increases, the principal stress of the surrounding rock increases gradually, as well as the Y-displacement of tunnel vault and bottom; (2) the influence of height-span ratios of the top karst cave on the maximum principal stress and displacement of the tunnel vault is the largest; and (3) the formula for the minimum safety thickness of rock resisting water inrush is obtained based on the catastrophe theory. The research results have certain reference significance and engineering application value for the prevention and control of water inrush disasters in karst tunnels and other similar underground engineering construction.
资助项目	National Natural Science Foundation of China[42007234] ; National Natural Science Foundation of China[41977222] ; Natural Science Foundation of Shandong Province[ZR2020QE263] ; China Postdoctoral Science Foundation[2019M652384] ; Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[Z019009]
WOS研究方向	Engineering
语种	英语
出版者	ASCE-AMER SOC CIVIL ENGINEERS
WOS记录号	WOS:000683879300012
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27654]
专题	中科院武汉岩土力学所
通讯作者	Wu, J.
作者单位	1.Shandong Univ, Inst Marine Sci & Technol, Qingdao 266237, 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	Zhang, L. W.,Fu, H.,Wu, J.,et al. Effects of Karst Cave Shape on the Stability and Minimum Safety Thickness of Tunnel Surrounding Rock[J]. INTERNATIONAL JOURNAL OF GEOMECHANICS,2021,21(9):15.
APA	Zhang, L. W.,Fu, H.,Wu, J.,Zhang, X. Y.,&Zhao, D. K..(2021).Effects of Karst Cave Shape on the Stability and Minimum Safety Thickness of Tunnel Surrounding Rock.INTERNATIONAL JOURNAL OF GEOMECHANICS,21(9),15.
MLA	Zhang, L. W.,et al."Effects of Karst Cave Shape on the Stability and Minimum Safety Thickness of Tunnel Surrounding Rock".INTERNATIONAL JOURNAL OF GEOMECHANICS 21.9(2021):15.