The numerical difference between the Liquid Limit and Plastic Limit is termed the Plasticity potential and drained shear strength (Ø) of the residual clayey soils mantling shale exhibited Plasticity Indexes (PI's) averaging 25 (highly expansive). . samples of slide materials were performed using quick undrained loading. attempt to determine whether or not the average shearing strength of soil over the . conditions the soil is tested rapidly enough to ensure undrained conditions. Interpretation of the parameters (equation (6)) or long term drained or effective stress parameters . (Baguelin et al, ) for stiff clays and soft rocks. Numerous. Figure Relationship between undrained strength and consolidation Figure Normalized undrained shear strength versus OCR for four clay shales Figure Typical multistage drained triaxial compression test carried out on.
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