ClarksonEng
Structural
An outside engineer firm is proposing a 10' diameter by 49' drilled shaft in soft clay soil. Using the geotechnical report, the axial load resistance is 266 kips. The pole supported has an axial load of 58 kips, but the foundation alone weighs 577 kips. This raised some flags for our engineering staff so we asked they provided supporting calculations, they answered with this:
"Note that the mass of concrete is displacing the in situ soil that will be removed and therefore only the net increase in mass need be considered. This net difference plus the axial load imparted by the pole can resisted by skin friction."
Is this an acceptable assumption? Other resources I've been able to find are for piles, and don't specify the type or diameter.
"Note that the mass of concrete is displacing the in situ soil that will be removed and therefore only the net increase in mass need be considered. This net difference plus the axial load imparted by the pole can resisted by skin friction."
Is this an acceptable assumption? Other resources I've been able to find are for piles, and don't specify the type or diameter.