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Passive soil pressure in granular soils

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I am working on a project in the Spokane, WA area.  The soils report indicates the material at the base of the footing is silty gravel with sand, medium to coarse grained, N=25, ASTM D2487=GM, no water.  I need to do some preliminary design on the footing this weekend.  What would be a conservative value to use for passive pressure coefficient (Kp) and for  soil-to-concrete friction?  Thanks in advance for your help.

 

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