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Pile Group - Uneven Pressure Distribution

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Farhaad Shaik

Structural
Mar 25, 2024
3
Hi,

Can anyone shed some light on the following statement. I am trying to do a google search and not too sure what action/phenomenon to search for.

Most important also will be the effects of the flow of material through the piles from the fill behind the abutment towards the downslope in front of the abutments because of the uneven pressures on both sides of the piles. To take this effect into account one typically users 2x the pile diameter for the area to apply the force from the moving soil on the piles. Important for you to read up on expert literature on these effects. This will only occur if you have a relatively thick compressible layer of soil below the approach fill.


 
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This question is similar to your previous question, that is, lateral load on bridge end bent piling because of sloping soil at the abutment:

Bridge_Abutment-400_may2ji.jpg


The lateral load is caused by the soil on one side of the piling being higher than on the other side (lateral force marked in red on the above image).

"2x the pile diameter" allows for lateral load on the soil surrounding the pile which applies lateral load to the pile through friction (in mechanical engineering this could be compared to "boundary layer effect").

The "relatively thick compressible layer of soil below the approach fill." allows the abutment soil to "move" enough that it applies lateral load to the piles.
 
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