dissipating footing pressure to soil below

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ketanco

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when we dissipate the footing pressure to the soil below, the pressure we take for the bottom of footing level should be

pressure coming from the building - pressure because of excavated material

and then we dissipate this net pressure, which mean the net pressure increase, to the soil below...

right?

sounds straightforward but i saw that at a few different locations they ignored subtracting the excavated soil. it means they omitted this by mistake correct?

 
Yes, the net pressure increase to be used at bot of ftg has overburden subtrafcted. Only the pressure additional to this will cause increase in stresses in soil layers below.

 
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