Assessing sliding of foundation, how to determine active lateral earth pressure?
Assessing sliding of foundation, how to determine active lateral earth pressure?
(OP)
I'm determining if a foundation for small tank requires piles or if a mat foundation is sufficient. I have a geotec report in the vicinity that provides the allowable soil bearing pressure to stay under a specified settlement. This allows me to check the overturning resistance for wind and seismic. The report does not provide the lateral earth pressure coefficients (at rest, active, passive) nor does it provide an angle of friction. Is it possible to determine the active lateral earth pressure coefficient with only knowing the various soil types and how far below the surface they are? Are there conservative values that are acceptable for pressure coefficients? If the foundation is 14'wide x 14'long x 5'high can I compare the pressure on one side due shear from wind against the allowable soil pressure?






RE: Assessing sliding of foundation, how to determine active lateral earth pressure?
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Assessing sliding of foundation, how to determine active lateral earth pressure?
I should clarify that the tank could better be called a silo.
RE: Assessing sliding of foundation, how to determine active lateral earth pressure?
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Assessing sliding of foundation, how to determine active lateral earth pressure?
RE: Assessing sliding of foundation, how to determine active lateral earth pressure?
Professional and Structural Engineer (ME, NH)
American Concrete Industries
www.americanconcrete.com
RE: Assessing sliding of foundation, how to determine active lateral earth pressure?
RE: Assessing sliding of foundation, how to determine active lateral earth pressure?
RE: Assessing sliding of foundation, how to determine active lateral earth pressure?
As for sliding: Agreed with Badger, for wind on a silo sliding typically will not be your primary concern; overturning will likely control. Passive pressure is typically associated with the 'bulldozing' resistance that you are hoping for - you should also obtain this value, and any friction factor, from the geotech.
RE: Assessing sliding of foundation, how to determine active lateral earth pressure?
TehMightlyEngineer: You mention that over-consolidation of backfill can lower the at-rest pressure coefficient. Is this because the vertical effective stress increases or because the effective horizontal stress decreases?
RE: Assessing sliding of foundation, how to determine active lateral earth pressure?