A.The reinforced-concrete cantilever-retaining wall pictured below has been backfilled with clean granular soil, is free to rotate, and has good drainage so that hydrostatic pressure will not build up behind the wall. The backfill, foundation, and concrete have the following properties: Concrete: _c = 150 pcf Granular backfill _ = 118 pcf KA = 0.3 KP = 3.3 _ (base of wall) = 0.5 B. Assuming no wall friction, the factor of safety against sliding is most nearly: A. 2.5 B. 4.25 C. 0.25 D. 1.25
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