INFLUENCE OF BACKFILLED SAND DIMENSIONS AND LOCATION ON SHAFT RESISTANCE OF PILES

Abstract

In this study, compressive loading tests of pile-overlapping backfilled soil were performed to investigate the effect of the dimensions and location of backfilled sand with different densities on the shaft resistance of the pile. The results showed that when the backfilled soil is dense sand, the shaft resistance is affected by the dimensions and location of the sand. The earth pressure at which the maximum value of the shaft resistance is reached is shown to be related to the distance from the outer surface of the pile to the outer edge of the backfilled sand (i.e., the width of the backfilled sand). Thereafter, a method was developed to evaluate the earth pressure related to the shaft resistance of the pile according to the width of the backfilled sand by dividing the sand into several segments in the circumferential direction. Based on these results, a calculation method was developed to calculate the maximum axial resistance of the pile considering various conditions (dimensions, location, and density) of the backfilled sand.