Mapping deeply buried karst cavities using controlled-source audio magnetotellurics: A case history of a tunnel investigation in southwest China

doi:10.1190/GEO2015-0534.1

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Mapping deeply buried karst cavities using controlled-source audio magnetotellurics: A case history of a tunnel investigation in southwest China
	Wang, Xingjian 1; He, Lanfang 2; Chen, Ling 2,3; Xu, Ligui 4; Li, Jian 5,6; Lei, Xuyou 5,7; Wei, Donghua 7,8
刊名	GEOPHYSICS
	2017
卷号	82 期号:1 页码:EN1-EN11
ISSN号	0016-8033
DOI	10.1190/GEO2015-0534.1
文献子类	Article
英文摘要	Karst cavity mapping is attracting great interest from engineering geologists because of its relation to the dangerous geohazards faced during engineering construction. Ground-based geophysical methods still face challenges in karst mapping, and concealed karst cavities potentially pose threats to tunnel construction in southwest China. Given the significant contrast in electrical resistivity between karst cavities and their host rocks, geoelectrical methods are widely used for mapping these cavities. We have developed a successful case history of mapping karst cavities on a planned railway route using controlled-source audio magnetotellurics (CSAMT). Scalar CSAMT, with frequencies ranging from 0.5 to 8192 Hz, was used for field data acquisition. A full-frequency domain apparent resistivity correction method was used for near-field corrections. Electromagnetic array profiling (EMAP) filtering was used for topographic and static shift corrections, and the Bostick conversion was used for data interpretation. Our study indicated that the results of the Bostick conversion with EMAP filtering were more acceptable than the results of rapid relaxation inversion and nonlinear conjugate gradient inversion in this case. The G Tunnel is a key tunnel along the Gui-Guang high-speed railway in southwest China. Initial geophysical and engineering geologic results suggest that the bedrock of the survey section of the G Tunnel route is sandstone. A CSAMT survey with three inline sections and three crossline sections over the tunnel route was conducted in two phases to verify the rock conditions of the tunnel route. A concealed karst cavity with a low-resistivity anomaly was found on the tunnel route and was verified by the borehole. Data from the CSAMT survey significantly refined our understanding of the subsurface engineering geologic conditions along the tunnel route.
WOS关键词	GUIZHOU PROVINCE ; INVERSION ; GEOCHEMISTRY ; EXPLORATION ; AREA
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SOC EXPLORATION GEOPHYSICISTS
WOS记录号	WOS:000396469700012
资助机构	National Natural Science Foundation of China(41674112 ; China Geological Survey(121201010000150005 ; CNPC Technical RD Project(2013D-3809) ; 41502111) ; 12120113095200) ; National Natural Science Foundation of China(41674112 ; China Geological Survey(121201010000150005 ; CNPC Technical RD Project(2013D-3809) ; 41502111) ; 12120113095200) ; National Natural Science Foundation of China(41674112 ; China Geological Survey(121201010000150005 ; CNPC Technical RD Project(2013D-3809) ; 41502111) ; 12120113095200) ; National Natural Science Foundation of China(41674112 ; China Geological Survey(121201010000150005 ; CNPC Technical RD Project(2013D-3809) ; 41502111) ; 12120113095200)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53063]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Wang, Xingjian
作者单位	1.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 4.China Natl Petr Corp, BGP, Oil & Gas Geol, Zhuozhou, Peoples R China 5.China Railway Eryuan Engn Grp, Engn Geophys Explorat & Detect, Chengdu, Peoples R China 6.China Railway Eryuan Engn Grp, Div Geol Invest, Chengdu, Peoples R China 7.China Railway Eryuan Engn Grp, Geophys Explorat Inst, Chengdu, Peoples R China 8.China Railway Eryuan Engn Grp, Engn Geophys Explorat, Chengdu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Xingjian,He, Lanfang,Chen, Ling,et al. Mapping deeply buried karst cavities using controlled-source audio magnetotellurics: A case history of a tunnel investigation in southwest China[J]. GEOPHYSICS,2017,82(1):EN1-EN11.
APA	Wang, Xingjian.,He, Lanfang.,Chen, Ling.,Xu, Ligui.,Li, Jian.,...&Wei, Donghua.(2017).Mapping deeply buried karst cavities using controlled-source audio magnetotellurics: A case history of a tunnel investigation in southwest China.GEOPHYSICS,82(1),EN1-EN11.
MLA	Wang, Xingjian,et al."Mapping deeply buried karst cavities using controlled-source audio magnetotellurics: A case history of a tunnel investigation in southwest China".GEOPHYSICS 82.1(2017):EN1-EN11.