I'm designing an addition to a concrete wastewater tank that was built in 1999 and I have the original soils report from 99, where it reccomends using equivalent fluid pressures of 65 pcf above the water table and 95 pcf below (at rest). The tank is 17' deep of which 16' is buried. Problem is, the addition will be built next to a 1:3 slope. I can find all kinds of formulas for the effect of a backslope on the active and passive pressures, but every reference I find is silent on the at-rest pressures with a backslope. The soil on site is mostly silty clay, and the wall will be backfilled with well graded granular soil. What effect does a backslope have on at-rest lateral earth pressure?
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