United States Department of Transportation
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Division of Engineering Research on Call, Agreement #34652. Task 1, Strength Reduction Method (SRM) Evaluation
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2021-07-01
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Abstract:The Ohio Department of Transportation (ODOT) wishes to compare their current industry standard landslide stabilization analysis method using traditional Limit Equilibrium Methods (LEM) to the Strength Reduction Method (SRM) of stability analysis, by reanalyzing two landslide projects with various SRM and LEM software packages and comparing the results. The SRM is described and compared to the LEM, and ODOT’s method of designing landslide stabilization piles (Geotechnical Bulletin 7) is explained. The results indicate that the safety factors from SRM compare well with Spencer and Morgenstern-Price methods of LE analysis for unreinforced slopes. For the slope reinforced with a stabilization pile, the SRM analysis was limited by the safety factor of the slope below the pile. Consequently, a direct comparison of maximum bending moment between SRM and GB 7 could not be made. But when the maximum bending moment in the pile was normalized by the change in safety factor from the unreinforced slope to the reinforced slope, the bending moment prediction from the SRM and GB 7 were very similar. The SRM is recommended when analyzing a slope with more than one row of piles. Either GB 7 or SRM may be used for a single row of piles, but both have different limitations. When the slope is not reinforced with piles, LEM and SRM should provide similar results. When subsurface conditions are complex, the use of SRM is beneficial to ensure the LEM search did not miss the critical non-circular failure surface.
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