Passive Resistance on the side of a column footing
Passive Resistance on the side of a column footing
(OP)
How do you all develop passive earth pressure parameters for assessing lateral resistance on the side of column (non-wall) footings? Although I often see people apply retaining wall type Kp theory, I have a problem with that for column footings (since that's based on an entire wall moving and creating a failure wedge from the footing to the ground surface). To me, the behavior with a column footing would be more of a deflection/modulus type movement initially which would transition to a sort of lateral punching shear failure if pressures kept increasing. Obviously there is some lateral resistance that would hinder movement but I have a tough time figuring out how to quantify it.





RE: Passive Resistance on the side of a column footing
So, if the footing has limited length (i.e. not plane strain conditions), you could apply a value of Cp (i.e., like a laterally loaded pile), which is approximated as phi/10. Cp is the term that considers arching of soil (i.e., the wedge) that will occur as the load is dissipated beyond the footing.
f-d
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