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• W2052261728 abstract "Research Article| August 01, 2009 Lessons Learned from Rates of Mudrock Undercutting Measured over Two Time Periods WILLIAM L NIEMANN WILLIAM L NIEMANN 1Marshall University, Department of GeologyHuntington, WV 25705 Search for other works by this author on: GSW Google Scholar Author and Article Information WILLIAM L NIEMANN 1Marshall University, Department of GeologyHuntington, WV 25705 Publisher: Association of Environmental & Engineering Geologists First Online: 02 Mar 2017 Online ISSN: 1558-9161 Print ISSN: 1078-7275 © 2009 Association of Engineering Geologists Environmental & Engineering Geoscience (2009) 15 (3): 117–131. https://doi.org/10.2113/gseegeosci.15.3.117 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation WILLIAM L NIEMANN; Lessons Learned from Rates of Mudrock Undercutting Measured over Two Time Periods. Environmental & Engineering Geoscience 2009;; 15 (3): 117–131. doi: https://doi.org/10.2113/gseegeosci.15.3.117 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEnvironmental & Engineering Geoscience Search Advanced Search Abstract Differential weathering is a common source of rock slope instability on the Appalachian Plateaus, where topography is often steep and widespread cyclothemic deposits contain repeated interfaces between weak mudrocks and more resistant beds of sandstone and limestone. Relatively rapid weathering of various mudrocks can undermine more competent overlying strata and lead to instability and failure in cut slopes. Rates of undercutting of the resistant units by weak units were measured at seven highway cuts ranging in age from 33 to 40 years. The average annual rate, 0.79 in. (2.0 cm), is approximately half that determined for the same sites by Shakoor and Rogers (1992) when the cuts were 18–25 years in age. At six of the seven sites, the length of measurable road cut had been reduced, in part because of new rock fall, and at four sites there had been no additional undercutting. Two failure modes are proposed for collapse of the overlying beds: 1) interaction of undercut surfaces with vertical jointing and 2) delayed tensile failure. The first failure mode is consistent with pre-1992 rock fall at all of the sites, as well as post-1992 rock fall at the three sites where undercutting has remained active. The second mode, less common overall, is consistent with rock fall at sites where undercutting has been inactive since 1992. The current study also confirmed two significant aspects of the previous study: 1) a correlation between slake durability and rates of weathering, and 2) extreme variability in weathering characteristics among sub-types of mudrocks. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2052261728 title "Lessons Learned from Rates of Mudrock Undercutting Measured over Two Time Periods" @default.
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• W2052261728 doi "https://doi.org/10.2113/gseegeosci.15.3.117" @default.
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