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Coarse Fraction <br />Effective Friction Angle, 9 <br />*Taken from greatest Principal Stress Ratio of each series <br /> <br />C] <br /> <br />Confining <br />Pressure <br />1000 PSF <br />(Sample C) <br />Confining <br />Pressure <br />7500 PSF <br />(Sample B) <br />Confining <br />Pressure <br />15000 PSF <br />(Sample A) <br />w <br />y <br />N <br />00 <br />w <br />a, <br /> <br />a <br />N <br />vi <br />y <br />N <br />?i <br />37.0° = T <br />Effective Normal Stress, a (PSF) <br />a3'= 1605 PSF <br />al'= 6453 PSF <br />iff = 1936 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 />37..1° = 9 <br />ctive Normal Stress, a (PSF) <br />a3'= 4112 PSF <br />a]'= 16628 PSF <br />Tff = 4990 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 />37._5° = tP <br />Effective Normal Stress, a (PSF) <br />a3'= 6874 PSF <br />al' = 28238 PSF <br />iff = 8477 PSF* <br />*max. shear stress at failure plane occuring <br />at 451 + T/2 from the initial effective <br />consolidation stress of a3'- Vick (1990)