Field tests on bearing characteristics of helical pile under uplift and uplift-lateral combined loading in soft clay

Abstract

In recent times, helical piles have found widespread application for commercial and residential buildings and tower foundations. In order to investigate the lifting and lateral-uplift combined load-bearing characteristics of the helical pile in soft clay, field tests were carried out. Two types of helical piles with single-helix and doublehelix configurations were set up for study. The displacement control effect of the double-helix helical pile is much better than the pile with one helix. When the helix spacing is four times the diameter of the helix, the circumferential shear failure mode occurs. However, under the influence of both uplift and lateral loads, the lateral loadcarrying capacity of helical piles with double helices is significantly larger than that of a single-helix helical pile due to the action of the top helix.