I am looking for clarification on line, strip and point load surcharge pressures. Is it when the surcharge is only located inside the soil failure wedge say 60 degrees up from the heel footing (AASHTO way) or is by the traditional Boussineq and Terzaghi Formulas. Both ways yields quite a difference in the "thrust load" on the wall. NAVFAC DM-7 uses the traditional Terzaghi formulas even if the surcharge is well outside the failure wedge zone. Can some explain this big difference in analysis. Thanks in advance.
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