What value of c and phi are appropriate for the material (compacted sand) in an MSE wall? Obviously the sand must have a phi of about 36 degrees. However, when running a global stability analysis, there must be some theoretical c, otherwise the wall cannot stand vertically. I seem to remember giving it a c of 800 psf. Another way I have seen it done is to put an extremely rigid layer at the base of the wall so that a failure circle does not pass through it. I use XSTABL for my analyses.
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