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Slimes Fraction <br />Effective Friction Angle, cD <br />*Taken from greatest Principal Stress of each series <br />Confining <br />Pressure <br />1000 PSF <br />(Stage 1) <br />w <br />a <br />M <br />37.,6° = T <br />Effective Normal Stress, a (PSF) <br />a3'= 338 PSF <br />al'= 1397 PSF <br />iff = 419 PSF* <br />*max. shear stress at failure plane occuring <br />at 45° + cp/2 from the initial effective <br />consolidation stress of a3' - Vick (1990) <br />Confining <br />Pressure <br />7500 PSF <br />(Stage 2) <br />w <br />a <br />31.9°=9 <br />ctive Normal Stress, a (PSF) <br />a3'= 2402 PSF <br />al'= 7787 PSF <br />iff = 2286 PSF* <br />*max. shear stress at failure plane occuring <br />at 45° + T/2 from the initial. effective <br />consolidation stress of a3' - Vick (1990) <br />Confining <br />Pressure <br />15000 PSF <br />(Stage 3) <br />w <br />a <br />N <br />32.4° = (p <br />Effective Normal Stress, a (PSF) <br />(y3'= 4733 PSF <br />al'= 15602 PSF <br />iff= 4596 PSF* <br />*max. shear stress at failure plane occuring <br />at 45° + cp/2 from the initial effective <br />consolidation stress of a3' - Vick (1990)