Fig. 15.46 10° 5.0 m Sand y = 18.0 kN/m³ $' = 34° c' = 0 1.0 m ☑ 1.5 m 0.5 m Clay y = 19.0 kN/m³ $' = = 24° c' = 10 kN/m² 2.0 m +
Part a.) Solve Problem 15.4 from your textbook using Rankine. When calculating F.S. for
overturning, ignore the contribution of Pp. When calculating F.S. for sliding include Pp in your
calculations, but decrease the effective friction angle and effective cohesion so that c’used=(2/3)c’soil,
and phi’used=(2/3)phi’
part b.) Using Coulomb’s active pressure, recalculate the factors of safety with respect to
overturning and sliding for problem 15.4. Assume ’ = 2/3 ’1
. In both analyses ignore the
contribution of Pp. When calculating F.S. for sliding, decrease the effective friction angle and
effective cohesion by 1/3.
15.4 Determine the factor of safety of the retaining wall shown in Figure 15.46 with respect to overturning, sliding, and bearing capacity failure. The unit weight of concrete is
24.0 kN/m^3.
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