NCEES Civil PE Specification Soil Mechanics: Lateral earth pressure
Problem
A granular backfill with an angle of internal friction of 30° is laterally supported by a retaining wall, extending to a height of 15 feet, as shown in the figure. The surface of the backfill is level and serves as a storage area for materials excavated from the site. The minimum setback distance X (ft), such that storage material is outside of the Rankine Active Failure Zone, is most nearly:
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