I have the attached where the retaining walls have a proposed flat area on an otherwise sloped hill. I don't have any information on the soil properties at the site this will be going on. They are trying to adapt a standard DOT design based on assumed soil properties (friction angle = 28 degrees) to this case but the standard gravity wall would be limited to only 4'-6" high due to the slope according to the DOT drawing.
Can the level area behind the wall be used to decrease the force on the wall from the sloped backfill above this level area?
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