TDOT SR-108 Landslide Repair - Anchored Soldier Pile and Tie Back System-Video

Video Transcription

Video Summary

The presentation covered TDOT’s SR-108 landslide project in Whitwell, Marion County, Tennessee. After major movement and drainage failures, TDOT engaged the team in 2020 to investigate and develop repairs. The site crosses varied Cumberland Plateau geology, including sandstone, shale, siltstone, and limestone. Difficult drilling and unexpectedly deep movement revealed a larger slide than initially assumed; the investigation ultimately included 21 borings, inclinometers, piezometers, and geophysical surveys.<br /><br />A rock buttress was considered but proved too costly. The selected concept is an approximately 1,800-foot anchored soldier-pile wall, supported by global-stability analyses using field measurements, laboratory testing, and geophysical data. The wall is intended to stabilize the roadway, not the entire hillside; some movement below it is expected to continue, likely more slowly. Drainage improvements, including horizontal drains, are also planned. Design work remains underway, with construction expected to follow and a future presentation planned.

Keywords

TDOT

SR-108 landslide

Whitwell Tennessee

anchored soldier-pile wall

drainage improvements

Cumberland Plateau geology