How to determine the vertical soil load on top of a 6" diameter buried cast iron drain pipe which is locate below a 6" thick reinforced structural suspended slab? The slab spans between drilled concrete piers at about 10 to 16 feet centres. The soil is very weak so the pipes are suspended from the structural slab above. I expect that the weight of soil that comes onto the pipe should be determined based on a wedge configuration, but are there any established procedures for this calculation?
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