United States Department of Transportation
i
SNAP (Soil Nail Analysis Program) User’s Manual
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2010-09-01
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[PDF-7.73 MB]
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Abstract:Soil nail walls are internally stabilized earth-retaining structures. Soil nail walls use a top-down construction with in situ reinforcement to support temporary or permanent excavations. In certain conditions, soil nailing is a viable alternative to other ground anchor systems, considering technical feasibility, cost, and construction duration. Although the use of soil nail walls for highway applications has increased dramatically in the past decade, computer programs for the design of soil nail walls are not up to date. The main objective of this work is to develop a state-of-the-practice computer program (Soil Nail Analysis Program) for designing all components of soil nail retaining structures, including nail and facing elements. The program will evaluate the internal and external wall stability (including limit-equilibrium global slope stability) based on the current standards in the ASD method. In addition, the program may be used to evaluate verification and proof field test results. All design and evaluation procedures are according to the FHWA guidelines presented in 1) The Manual for Design and Construction of Soil Nail Walls, Report No. FHWA-SA-96- 069R, and 2) Geotechnical Engineering Circular No. 7 - Soil Nail Walls, Report No. FHWA-IF-03-017. This user’s manual discusses the theoretical basis for the computer program, gives a comparison of available soil nail wall design guidelines, discusses program execution including inputs and outputs, and includes two worked examples to demonstrate use of the program.
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Content Notes:COTR: Khamis Haramy, FHWA-CFLHD. Advisory Panel Members: Roger Surdahl, FHWA-CFLHD; Barry Siel, FHWA-RC; Khalid Mohamed and Rich Barrows, FHWA-WFLHD. This project was funded under the FHWA Federal Lands Highway Coordinated Technology Implementation Program (CTIP).
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