Passive Resistance on the side of a column footing

[motorbiketocrank]

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.

 

[fattdad]

It depends on the width of the footing. I mean whether to use plane strain earth pressures. . .

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

¡papá gordo ain’t no madre flaca!