Temporary slopes (stand-up time is several weeks) up to 20-30 feet high are proposed in unsaturated clay soils, with a moisture content of about 10-20%. Torvane/Pocket Pen. indicates Su of clay is stiff to very stiff. Phi=0 analysis is not really valid for unsaturated soil, and effective stress analysis using direct shear results run saturated is probably very conservative as it neglects negative pore pressures. Any suggestions in what shear strength to use for temporary slope stability analysis?
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