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Geomechanics and Engineering
  Volume 18, Number 6, August30 2019, pages 615-626

Performance evaluation of the lightweight concrete tapered piles under hammer impacts
Omid Tavasoli and Mahmoud Ghazavi

    Lightweight concrete (LWC) provides an attractive alternative to conventional piles by improving the durability of deep foundations. In this paper, the drivability of cylindrical and tapered piles made of lightweight and common concrete (CC) under hammer impacts was investigated by performing field tests and numerical analysis. The different concrete mixtures were considered to compare the mechanical properties of light aggregate which replaced instead of the natural aggregate. Driving tests were also conducted on different piles to determine how the pile material and geometric configurations affect driving performance. The results indicated that the tapering shape has an appropriate effect on the drivability of piles and although lower driving stresses are induced in the LWC tapered pile, their final penetration rate was more than that of CC cylindrical pile under hammer impact. Also by analyzing wave propagation in the different rods, it was concluded that the LWC piles with greater velocity than others had better performance in pile driving phenomena. Furthermore, LWC piles can be driven more easily into the ground than cylindrical concrete piles sometimes up to 50% lower hammer impacts and results in important energy saving.
Key Words
    pile driving; lightweight concrete (LWC); tapered pile; field testing; signal matching; finite difference method
Omid Tavasoli: Department of Civil Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran

Mahmoud Ghazavi: Department of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran

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