Treatment of Karst Along Tennessee Highwaysby Harry Moore, Tennessee DOT, Knoxville, TN, USA,
Abstract: The construction and maintenance of highways in karst areas of East Tennessee has resulted in the occurrence and treatment of induced sinkholes along the ditchlines of numerous highways. Due to the geologic conditions prevelant in the Ridge and Valley province, belts of karst areas are frequently crossed by transportation corridors. Roadways constructed in these karst areas have repeatedly resulted in the development of sinkholes along the ditchlines. The collapse features occur where the pinnacle-soil interface is breached by the ditchline excavation and the resultant ditchline is untreated. Treatment of the sinkholes usually involves bridging of the collapse with chunk rock backfill and treating the ditchline with an impervious material. Geotechnical input at the design phase has resulted in the treatment of the ditchlines in areas where highways are constructed across terrain prone to karst development.
Subject Headings: Highways and roads | Karst | Highway and road design | Sinkholes | Infrastructure construction | Land subsidence | Material failures | North America | Tennessee | United States
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