Prediction of stone column ultimate bearing capacity using expansion cavity model

Abstract

The ultimate bearing capacity of an isolated column was investigated by combining a state of stress with a failure mechanism of lateral expansion in a cylindrical cavity which reproduces the stone column installation in a purely cohesive soft soil. Some analytical and empirical methods were used to determine the limit pressure of a cylindrical cavity with the assumption of varied behaviour laws of the medium around the cavity. These models permitted the calculation of the limit pressure of an expanded cylindrical cavity from which the ultimate bearing capacity was derived. Using recorded in situ data from load tests performed on 13 isolated column configurations, the model parameters are identified. A comparison between experimental data and predictions generated from several models is presented.