"Five electrical resistivity tomography (resistivity) case studies are presented. The first case study, entitled "Springfield Underground", includes ERT data acquired with the purpose of imaging the ceiling of an limestone aggregate mine following simultaneous localized roof failure. The interpretation of the ERT data indicates roof rock failure occurred at the intersection of two previously unmapped near-vertical solution-widened fractures.
At the "Chesterfield Dam" site, resistivity data were acquired to identify the zone of seepage through an earthfill dam. The seepage pathway beneath the dam is interpreted as through a solution-widened fracture, the top of which constituted a segment of the original stream channel. The "Gasconade River" case study includes resistivity data acquired beneath two bridges in order to map the areal extent of an underground waterfilled opening encountered in routine investigative borings. Two principle east-northeast trending fracture zones were identified on the ERT data and the areal extent of the waterfilled void was mapped based on the acquired resistivity data. The "Jefferson City" case study includes resistivity data acquired to map variable depth to the top of bedrock. It is concluded that the southeastern part of the study site overlies an upper erosional terrace, whereas the northwestern part overlies the erosional stream channel. A conceptual model of the formation the upper terrace is proposed. In the fifth case study, "Lane Springs", resistivity data were acquired immediately adjacent to Lane Spring with the purpose of mapping the aquifer and variable depth to top of rock.
The conducted research demonstrated the ERT method was an effective tool for imaging the subsurface in the karst terrain"--Abstract, page iii.
Anderson, Neil L. (Neil Lennart), 1954-
Salam, Mohamed Abdel
Cawlfield, Jeffrey D.
Maerz, Norbert H.
Geosciences and Geological and Petroleum Engineering
Ph. D. in Geological Engineering
Missouri University of Science and Technology
xiii, 133 pages
© 2012 Evgeniy Vladislavovich Torgashov, All rights reserved.
Dissertation - Restricted Access
Tomography -- Scientific applications
Karst -- Missouri
Electrical impedance tomography -- Case studies
Imaging systems in geology
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu:80/record=b9791200~S5
Torgashov, Evgeniy V., "Imaging the subsurface in karst terrain using electrical resistivity tomography" (2012). Doctoral Dissertations. 43.
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