LANDSLIDE CORRECTION ON I-75 IN CAMPBELL COUNTY, TENNESSEE

Subsidence of the southbound lanes of I-75 in Campbell County, Tennessee in late winter of 2005 revealed the existence of a major landslide condition requiring the closure of Interstate 75. A geotechnical investigation revealed that the highway embankment was originally constructed on a colluvial deposit of sandstone boulders and soil in the early 1960's.

Repair of the landslide required massive excavation into in-place stable bedrock and the rebuilding of the highway embankment. A new technology, referred to as “Launched Soil Nails”, was employed during the slide repair operation to temporarily stabilize a 15 meter (50 foot) high, 100 meter (300 foot) long soil cut slope. The landslide repair was accomplished by the construction of a conventional graded rock buttress in less than 60 days.