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;, <br />~. <br />ROAD CUT SLOPES <br />A representative "worst case" road cut slope was selected for a slope stability <br />analysis and wos found to have a slope angle of 35°. The unit weight of the mate- <br />rial forming the slope was estimated to be 88 Ib/ft3, with a cohesion of 1000 Ib/ft2. <br />The friction angle was defined as the angle of repose of the material of 37°. <br />Since no outside forces are acting on the slope, only The weight of the material itself <br />could cause the slope to fail. <br />Factor of Safety Calculation fora Representative Road Cut Slope <br />Slope Angle - ~ 35.4° <br />Fraction Angle - ¢ = 37° (Angle of Repose) <br />' UniT Weight - Y = BB Ib/ft3 (Loose Material) <br />Cohesion - C = 1000 Ib/ft2 (Loose Material) <br />Water Uplift Pressure - ~ = 0 <br />C <br /> <br />Slice <br />(ll) Unit <br />Weight <br />(Y) Height <br />of Slice <br />(H) Vertical <br />Stress <br />(YH) Width <br />of Slice <br />(fix) Angle <br />of Slice <br />(a) <br />I 88 8 704 I S _ 2.3° <br />2 88 16 1408 IS 11.7° <br />3 88 18 1584 IS 25.5° <br />4 88 ~ 15 1320 15 36.3° <br />5 88 6 528 12 49.8° <br />Revised 3/82 <br />3.56-7 <br />