Publication Abstract

Proceedings - Fourth International Conference - Piling and Deep Foundations, 1991, Stresa, Italy, (DFI)

A Three Dimensional Model for Single Piles in Sand
T.Q. Nguyen & A.M. Hanna Department of Civil Engineering, Concordia University, Canada

A three-dimensional model was developed to incorporate salient features previously neglected in conventional bearing capacity theories of a single pile in sand. These features include: treating the pile bearing capacity as a coupled, interaction problem between shaft and point resistance and adopting punching shear as the unique mode of failure. The latter feature was implemented to advantage by Sarma's method of slice. The proposed model suggests that the critical depth concept may be clearly understood in light of a variable failure mechanism and a variable shear mobilization along the critical surface partially developed beneath the pile tip. The model also shows great promise as a distinct rational approach to evaluate shaft friction, based on point resistance and, as such, is capable of taking into account important effects of the sand density, the relative depth, the initial lateral earth pressure, and the roughness of the pile.

 article #501; publication #37 (IC-1991-IT)