Abstract:
Faisal Shahzad (corresponding author)
Master Student, Department of Civil and Environmental Engineering, Saitama University, Japan
faisalshahzad352@gmail.com
Adnan Anwar Malik
College of Engineering, Science and Environment, Newcastle Australia Institute of Higher Education, Singapore
adnananwar.malik@newcastle.edu.au
Jiro Kuwano
Department of Civil and Environmental Engineering, Saitama University, Japan
jkuwano@mail.saitama-u.ac.jp
Tadashi Maejima
ASAHI KASEI CONSTRUCTION MATERIALS CORPORATION
maejima.tc@om.asahi-kasei.co.jp
Keywords: Open-end screw pile, Close-end screw pile, Model pile load test, Bearing capacity,
Abstract:
Single helix screw piles carry most of the structural load through end-bearing if the helix is embedded in the dense bearing layer. The tip condition of the central shaft of the screw pile can be closed, closed with cutting blades, opened with flat cut, and opened with wedge shape cut and its selection based on the in-situ ground conditions. These different end conditions of the central shaft disturb the ground differently, leading to the change in bearing capacity. In this study, an attempt is made to investigate the effect of open and close-end screw piles on installation effort (installation load and torque) and bearing performance in the dense bearing layer. The model steel screw pile with a pile shaft diameter of 21.7 mm and helix diameter of 43 mm is used in this study. Test results show that the open-end screw pile required less installation effort than the close-end pile that penetrated the bearing layer by 1Dh with an unplugged condition. Further, the open-end screw pile shows a higher bearing response than the close-end screw pile if it enters the bearing layer with an unplugged condition.