Assessment of ultimate bearing capacity of the pile for jacking 4 & rotary piling method

Selecting method of pile installation is one of the most factors which affect progress of a construction project. During the installation process, using command methods was
discovered to have some weaknesses, such as high friction resistance and high settlements, which could lead the structure to fail. To overcome these problems, this study introduces new method of pile installation which is Jacking and Rotary method (J&R). The objective of this study is to
determine pile behavior for static load test when utilizing a common method namely jacking (J), and a new method of pile installation, J&R through the ultimate pile capacity achieved by both methods. A stainless steel 25 mm circular pile, a 50 mm circular pile and a screw pile were used as test piles for this investigation. To achieve the objeetives, this study employed graphical methods such as Brinch Hansen 80 % and Tangent method to determine the ultimate pile capacity for both piling installation methods. Results revealed that for jacking method, the highest
ultimate pile capacity value for the 50 mm circular pile was 1.186 kN, whereas the 25 mm circular pile had the lowest pile capacity reading of 0.539 kN. While for J&R, the highest average for both graphical methods is screw pile with 0.683 kN, while the 50 mm circular pile produced the lowest pile capacity which was 0.491 kN. Results indicated the acceptable of J&R methods and suggest further investigate for this method such as the response of pile under axial loading and other tests.