Seepage Remediation and Karst Foundation Treatment at Clearwater Dam, Piedmont, Missouri

Abstract

Research Article| August 01, 2010 Seepage Remediation and Karst Foundation Treatment at Clearwater Dam, Piedmont, Missouri MICHAEL A KNIGHT; MICHAEL A KNIGHT 1Gannett Fleming, Inc. P.O. Box 67100, Harrisburg, PA 17106-7100 1Corresponding author email: mknight@gfnet.com. Search for other works by this author on: GSW Google Scholar MARK C HARRIS; MARK C HARRIS 2U.S. Army Corps of Engineers – Little Rock District, Little Rock, AR Search for other works by this author on: GSW Google Scholar BOBBY E VAN CLEAVE; BOBBY E VAN CLEAVE 3U.S. Army Corps of Engineers – Little Rock District, Little Rock, AR Search for other works by this author on: GSW Google Scholar ADAM N HOCKENBERRY ADAM N HOCKENBERRY 4Gannett Fleming, Inc. P.O. Box 67100, Harrisburg, PA 17106-7100 Search for other works by this author on: GSW Google Scholar Author and Article Information MICHAEL A KNIGHT 1Corresponding author email: mknight@gfnet.com. 1Gannett Fleming, Inc. P.O. Box 67100, Harrisburg, PA 17106-7100 MARK C HARRIS 2U.S. Army Corps of Engineers – Little Rock District, Little Rock, AR BOBBY E VAN CLEAVE 3U.S. Army Corps of Engineers – Little Rock District, Little Rock, AR ADAM N HOCKENBERRY 4Gannett Fleming, Inc. P.O. Box 67100, Harrisburg, PA 17106-7100 Publisher: Association of Environmental & Engineering Geologists First Online: 02 Mar 2017 Online ISSN: 1558-9161 Print ISSN: 1078-7275 Copyright © 2010 EEGS Environmental & Engineering Geoscience (2010) 16 (3): 195–210. https://doi.org/10.2113/gseegeosci.16.3.195 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 MICHAEL A KNIGHT, MARK C HARRIS, BOBBY E VAN CLEAVE, ADAM N HOCKENBERRY; Seepage Remediation and Karst Foundation Treatment at Clearwater Dam, Piedmont, Missouri. Environmental & Engineering Geoscience 2010;; 16 (3): 195–210. doi: https://doi.org/10.2113/gseegeosci.16.3.195 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 Following the detection of a sinkhole in the upstream face of Clearwater Dam in January 2003, substantial efforts have been completed to explore and pre-treat the dam foundation in preparation for construction of a “hanging” cutoff wall that will complete the seepage remediation program. Initial phases of pre-treatment started in 2004 and included core drilling and placement of both low- and high-mobility grouts in the immediate vicinity of the sinkhole. This work preceded the more extensive efforts that were completed in the fall of 2009. The recently completed project was primarily a down-stage, high-mobility grouting effort involving approximately 840 boreholes in two lines along the 4,225-ft–long embankment. In addition, the project also included treatment of an extensive epikarst zone and placement of low-mobility and sanded grout mixes in selected problematic locations. High initial epikarst and bedrock permeability ranging from 20 to 200 Lugeon was reduced using systematic grouting approaches focused toward achieving a pre-treatment target of 10 Lugeon within the vertical limits of the proposed cutoff wall and a 3-Lugeon target beneath the proposed cutoff wall. Pervasive solution-enhanced bedrock fractures resulting from repeated tectonic uplift and sub-aerial exposure set forth challenging conditions in the face of the pre-treatment objectives. Against this baseline condition, the recent grouting efforts have set the stage for construction of a cutoff wall and completion of the Clearwater Dam Major Rehabilitation Project. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.