We want to design an underground support similar to a combined footing for a heavy underground asset. It will all be underground and filled and compacted at the end. We would not be using geotech reports and will be using the presumptive values given by IBC 1806.2 (1500psf). When performing a bearing check under the face of the support, would the load used for dividing by the area include the weight of the soil above the support, or just the weight of the asset? Would I also add the weight of the concrete support minus the weight of the soil displaced?
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