Driven pile radial stress

[Drej]

Hi all,

Mechanical engineer here with a civil engineering question. I'm assessing a tube (CHS) which is being driven into a silty sand or sludge type material and need to determine the radial stress/pressure acting normal to the surface of the tube. I've determined the pile toe and surface resistance but cannot seem to find an equation to describe the radial pressure. Is there a simple analytical expression for this?

Many thanks.


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[Ron]

In its simplest form, use the soil unit weight x the depth to the point of interest. Application on the face of the pile will be uniform at the depth. You could waste a lot of time considering passive and active pressures on the pile from various orientations, but to me would not be worth the effort.

 

[Drej]

Thanks for the reply. Just want to be clear I've understood you correctly. The silty sand material is contained within a tapered tank and hence from your suggestion I'm thinking that the pressure acting on the pile will be depth dependant, something like:

P = m.g.h

Where
m = mass per unit area
g = gravitational constant
h = height of pile under the sand


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[Drej]

Sorry, just noted the expression above is per unit volume.


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