Publication Abstract




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

83 Stress development in sand due to installation and uplifting of screw anchors
A. Ghaly & A. Hanna Concordia University, Montreal, Canada

Experimental investigation on stress development in sand due to installation and uplifting of screw anchors is presented. Five model screw anchors with different geometry were tested to examine the effect of screw shape of stress development in sand. Anchors were installed into prepared layers of dense, medium, and loose sands. The testing tank was equipped by stress transducers located in predetermined positions to allow measuring the stress in the sand around and in the near vicinity of the installation path. Stress transducers were oriented such that vertical and lateral stresses could be measured. Deflections of sand surface, during pullout load application, were measured by displacement transducers. Measured stresses were used to determine the extent of stress field inside the sand. The stresses measured within the sand together with the recorded surface deflections were utilized to establish the mechanism of failure.


 article #519; publication #37 (IC-1991-IT)