The Evolution of Launched Soil Nails: A 30-Year Retrospective

by Colby Barrett, P.E., (M.ASCE), President, colby@gsi.us,
Graeme Quickfall, Canada Division Director, graeme@gsican.ca,


Serial Information: Geo-Strata —Geo Institute of ASCE, 2016, Vol. 20, Issue 5, Pg. 32-38


Document Type: Feature article

Abstract: Launched soil nails are a unique remedial technology in the geotechnical construction toolbox. These 20-ft-long, 1.5-in.-diameter nails are installed in a single shot using a compressed air "cannon" at velocities of up to 250 miles/hour, and at rates approaching 250 nails/day. The nails reinforce an unstable or potentially unstable soil mass by transferring the nail's tensile and shear capacity into the sliding soil. However, at least as interesting as the tool itself, is the story behind the development of launched soil nail technology over the past 30 years.

Subject Headings: Soil nailing | Soil stabilization | Remediation | Construction management | Compression | Mass transfer | Ultimate strength

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