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Correlation between SPT and Passive Pressure

Correlation between SPT and Passive Pressure

Correlation between SPT and Passive Pressure

(OP)
I am trying to find a correlation of SPT to passive pressure.  I need to find the lateral capacity of a pile.

Appreciate any help.

RE: Correlation between SPT and Passive Pressure

Just bear in mind if it's frictional soil (i.e., where you can rely on a friction angle), the coefficient of passive earth pressure will be greater than determined using Rankine earth pressures.  This is usually a factor of 2 or 3 (typified as phi/10).

If all you have is SPT N-values and you are in granular soils, you'd fine a correlation to friction angle and then use tan^2(45+phi/2) to get Kp.  You'd then multiply Kp by Cp (phi/10) to get the ultimate passive pressure for the pile.

This is a pretty easy exercize.  Now what's the lateral displacemnt under that horizontal load?  That's where the body's buried. . .

f-d

¡papá gordo ain't no madre flaca!

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