I have a great book by M.and A. Reimbert titled "Retaining Walls" that indicates the active pressure on a wall from a purely a granular or gravelly material is based on its angle of repose. Essentially the lateral pressures are considerably reduced when using a crushed stone for backfill in lieu of a mixed soil. The book is filled with nice experiments and totally disputes Rankines active pressure formula. Does anyone have any tips on this gravel issue. Thanks.
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