Theory 11/Geotechnical Engineering

Pile Capacity Is a Socket Ratio

The claim

Capacity of a rock-socketed pile is set by the ratio of socket length to diameter rather than by socket length alone.

01Mechanism

Load transfers through side shear over the socket and through end bearing at the base; the ratio determines how much of the load reaches each mechanism.

02Predictions

P1Capacity should collapse onto the ratio.
P2Absolute length should mispredict across diameters.

03Refutation

Capacity tracking socket length alone would remove the ratio.