Underground footing for underground facilities bearing check
Underground footing for underground facilities bearing check
(OP)
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?





RE: Underground footing for underground facilities bearing check
RE: Underground footing for underground facilities bearing check
RE: Underground footing for underground facilities bearing check
So, in order to use the presumptive values in IBC, you need to know generally what type of soil you have. Are you able to do this without the input of a geotechnical engineer?
Generally, allowable bearing capacity is given as the NET bearing capacity. This means any additional weight the soil will see other than the weight of itself in the existing, undisturbed condition. Calculate the weight of the structure and any loads on the structure and the weight of the displaced soil. Compare these values to determine if you have any net increase in soil bearing pressure and if so, then compare the increase to the allowable soil bearing pressure.
RE: Underground footing for underground facilities bearing check
RE: Underground footing for underground facilities bearing check
RE: Underground footing for underground facilities bearing check