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FACTOR OF SAFETY CALCULATIONS <br />•_ <br />y - Unit weight of material = 160 Ib/f t3 <br />yW - Density of water 62.4 Ib/ft3 <br />~yf - Slope angle = 85° <br />~ - Friction angle = 37° <br />H - Slope height = 80.4' <br />c - Cohesion = 30,000 Ib/ft2 <br />Failure Surface Calculation <br />VPc=61° ~- • <br />Tension Crock Depth Calculation <br />• Zc/H = I - cot yf•tan yp <br />Zc/80.4 = I - cot 85 •tan 61 <br />Zc = 48.5 ft. <br />Tension Crack Position Calculation <br />be/H = /cot V~f • cot yp -cot ~rf <br />be/80.4 /coi 85 cot 61 -cot 85° <br />• be = 10.6 ft. <br />Calculation for the Area of the Sliding Svrface <br />A = (H - Z) cosec yip <br />A = (80.4 - 48.5) cosec 6 I ° <br />A = 36.5 <br />• <br />Revised 3/82 3.5C-3 <br />