Where retaining walls are underlain by weak soils, the overall stability of the soil mass containing the retaining wall should be checked with respect to the most critical surface of sliding. A minimum safety factor of 2.0 is desirable but may not always be achievable. A technique known as slip circle analysis can be used to check for global stability. Refer to standard texts on soils engineering.
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TABLE 8.3 Relationship between Soil Backfill Type and Wall Rotation to Mobilize Active and Passive Earth Pressures behind Rigid Retaining Walls
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