Effect of diameter on the load carrying capacity of Closed-Open Ended Pipe piles

Abstract

This study investigates the behavior of the components on the pile loading capacity and the effect of removing the components. The sand is used as a fine, sandy soil. It was prepared with different densities using rain technology. The soil plug was removed by a device that was manufactured to remove the soil column trapped inside the piles of the pipes during installation by driving and pressing devices. The present study focuses on determining the effect of soil plug on the maximum load capacity of the open-end steel pipe pile and comparing it with the closed pipe pile. A new type of piles of pipes is proposed; piles of open-ended organic pipes driven and compressed in sandy soils of different densities (medium and dense) where axial pressure tests were carried out on the piles of the model. The end of the pile will be open at a predetermined depth in order to facilitate the penetration of the pile base and close it at a distance to increase the resistance of the pile base. The open pile models were modified by closing the ends of the pile by a welded plate at a distance of two, three, and four D (where D is the diameter of the pile) by the pile.It was concluded that increasing the diameter of the pile from 20 mm to 40 mm caused increase in the pile bearing capacity by about 275 – 615%, while in closed-ended piles, the same increase in pile diameter caused increase in the bearing capacity of about 320 – 860%. On the other hand, in closed-open-ended piles, this increase improves the bearing capacity by about 490 – 1020%. The results prove the controlling importance of the pile diameter in the proposed type of piles; closed-open-ended type.