Chapter
Apr 26, 2012

Sinkhole Repair under Highway Embankment

Publication: Geotechnical Engineering for Transportation Projects

Abstract

In March of 2002, a depression was discovered in the eastbound lane of SC22 near Conway, South Carolina. Within hours, a hole developed that revealed a void beneath the asphalt pavement approximately 8 feet deep by 10 feet wide. As a safety precaution, the SCDOT filled the void with flowable fill and patched the asphalt while further investigations were conducted. Further investigation revealed that a collapse type sinkhole had developed beneath the relatively new roadway. Geophysical testing data along with several Soil Test Borings were performed to evaluate the potential cause of the sinkhole as well as potential for future sinkhole development in the area. Although the potential for sinkhole development has always existed in the area due to the Coquina Limestone that underlies the relatively thin overburden, the absence of large-scale development has limited the occurrence of sinkholes in the area to subsidence type. As many of these sinkholes go unreported or unnoticed, this phenomenon is not well understood in the immediate area. Using the field investigation tools available, potential solutions to this sinkhole have been developed as well as precautionary measures to reduce the risk exposure as large-scale infrastructure projects continue to be constructed throughout the area.

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Go to Geotechnical Engineering for Transportation Projects
Geotechnical Engineering for Transportation Projects
Pages: 1840 - 1847

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Published online: Apr 26, 2012

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Authors

Affiliations

Thomas J. Casey
P.E.
Project Geotechnical Engineer, WPC, Mt. Pleasant, SC 29464
William B. Wright
P.E.
Senior Geotechnical Engineer, WPC, Mt. Pleasant, SC 29464
Michael Lockman
P.E.
Geotechnical Materials Engineer, South Carolina Department of Transportation, Columbia, SC 29201
Guoming Lin, Ph.D.
P.E.
Senior Geotechnical Engineer, WPC, Mt. Pleasant, SC 29464

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