Effect of Compressive Load on Uplift Capacity of Single Piles: An Investigation

Abstract

In this paper, an analytical model has been proposed to predict the net ultimate uplift capacity of single piles embedded in sand subjected to stage compressive loading of 0%, 25%, 50%, 75% and 100% of their ultimate capacity in compression. The following parameters have been considered as variables: density of foundation medium, embedded length to diameter ratio (L/d) of piles, stages of compressive loads. The presence of compressive load on the pile decreases the net ultimate uplift capacity of pile and the decrease depends on the magnitude of presence of the compressive load. It may be due to change in the particle size distribution, soil pile friction angle, or soil compressibility. The change in soil-pile friction angle has been considered in the present model. To validate the model, a comparison has been made with the available laboratory model test results (Dash and Pise2003) and the results obtained from the present model.