From the GMA Techline
Subject: Veneer stability I have a question about veneer stability in moving earth upslope vs. downslope. In the downslope equations in GRI18, how is the lack of a buttressed passive wedge accounted for in the factor of safety (FS) equations during placement of soil? I think I am getting confused on how the passive wedge is defined on a downslope placement of material.
(Matt, South Carolina)
Reply: Moving upslope, we have the passive wedge as a buttress. It is not a big item unless you go into a tapered cover soil scenario. That said, there is no buttress going downslope. Perhaps more importantly, I have assumed that there are no dynamic forces going upslope and that there are such forces going downslope. This is the really important assumption and the one that significantly decreases the FS value.