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• W4200504821 abstract "PreviousNext No AccessSixth International Conference on Engineering Geophysics, Virtual, 25–28 October 20213D muongraphy for the detection of fracture zones in mountainsAuthors: Chenyan WuDikun YangKe WangZhongchang ChenTao ChenChenyan WuSouthern University of Science and TechnologySearch for more papers by this author, Dikun YangSouthern University of Science and TechnologySearch for more papers by this author, Ke WangSouthern University of Science and TechnologySearch for more papers by this author, Zhongchang ChenSouthern University of Science and TechnologySearch for more papers by this author, and Tao ChenSouthern University of Science and TechnologySearch for more papers by this authorhttps://doi.org/10.1190/iceg2021-074.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Fracture zones in mountains are hazardous for the infrastructure constructions like tunnels. In order to prevent collapses triggered by constructions and ensure the safety of infrastructures, it is necessary to accurately locate fracture zones before and during the construction. Many geophysical methods are effective in finding fracture zones, but can have difficulties in mountainous areas because of topography and vegetation. Conventional geophysical methods are also likely to be prone to the interferences from constructions. In this feasibility study, we propose to use muongraphy to image the fracture zone in a mountain. Attenuation of cosmic-ray muon flux is associated with the density distribution along muon ray paths. The density of the target can be imaged by converting attenuated fluxes into opacity and then inverting the opacity to recover the density model. In our example, we design a mountain model containing a low-density fracture zone using a realistic topography. Four muon detectors are placed at the western, eastern, northern and southern foots of the mountain. Each detector can receive muon rays within a wide zenith angle in all azimuthal directions. In the inversion, we implement a positivity density constraint using the alternating direction method of multipliers (ADMM). The recovered 3D density model delineates the upper section of the low-density fracture zone well, but the bottom part is ambiguous because of poor coverage of muon ray paths. Then a fifth detector is placed in a tunnel inside the mountain as a measure of early warning during boring. The addition of the in-tunnel detector significantly improves the resolution for the fracture zone at the bottom of the mountain. Our study has shown that muongraphy can be an effective tool in the detection of hazardous geological objects in mountains, and can be applied to engineering exploration. Keywords: 3D, imaging, inversion, fractures, noise Permalink: https://doi.org/10.1190/iceg2021-074.1FiguresReferencesRelatedDetails Sixth International Conference on Engineering Geophysics, Virtual, 25–28 October 2021ISSN (online):2159-6832Copyright: 2021 Pages: 341 publication data© 2021 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 24 Dec 2021 CITATION INFORMATION Chenyan Wu, Dikun Yang, Ke Wang, Zhongchang Chen, and Tao Chen, (2021), 3D muongraphy for the detection of fracture zones in mountains, SEG Global Meeting Abstracts : 289-293. https://doi.org/10.1190/iceg2021-074.1 Plain-Language Summary Keywords3Dimaginginversionfracturesnoise PDF DownloadLoading ..." @default.
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• W4200504821 title "3D muongraphy for the detection of fracture zones in mountains" @default.
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