United States Department of Transportation
i
Hollow Bar Soil Nails Pullout Test Program
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2010-05-01
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[PDF-5.03 MB]
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Edition:Final Report
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Abstract:The use of Hollow Bar Soil Nails (HBSNs) is growing in the excavation support and retaining wall construction. It is anticipated that the use of the HBSN technology could reduce construction schedules, costs, and environmental impacts. The current state of practice for design bond strengths and load testing procedures is based on the current soil nail practice but varies depending on the installation contractor and product recommendations. The objective of this study was two-fold. The first objective was to develop an initial data file from installation and testing at four sites of the available grout-to-ground bond stress of HBSNs, and to determine if correlations exist with traditional solid bar, drill, and grout soil nails (for example, the published nominal values in FHWA-IF-03-017 [GEC No. 7]). The second objective was to establish recommendations for practical, standard ways of performing pullout tests on HBSNs. Comparisons between the pullout test results showed that the HBSNs generally developed larger bond strength values in granular soils than the Solid Bar Soil Nails (SBSNs). Three installation methods for purposes of pullout and proof testing were evaluated. Two were found to be to be satisfactory; however, the third one was noted to have a significant Doughnut Effect and was not recommended for pullout testing.
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Content Notes:COTR: Justin Henwood, FHWA-CFLHD. Advisory Panel Members: Matthew Demarco and Roger Surdahl, FHWA-CFLHD; Scott Anderson and Barry Siel, FHWA-RC; and Rich Barrows, FHWA-WFLHD. This project was funded by the FHWA Federal Lands Highway Geotechnical Program, the FHWA Federal Lands Highway Technology Deployment Program, and the Association of Drilled Shaft Contractors – The International Association of Foundation Drilling.
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