Abstract
In the present study, the end bearing capacity of screw and straight pipe pile under similar pile tip area and ground conditions were investigated. The effect of increasing overburden pressure was also considered in this research. Pile load tests on close-ended screw and straight pipe piles were conducted in the small scale. Dry Toyoura sand was used to develop the model ground. The sand was compacted at relative density of 70, 80 and 92 %. It was observed that in case of straight pipe pile, load settlement curve plunges downward without increase in load around settlement equals to 10 % of pile tip diameter, whereas in case of screw pile, the load settlement curve plunges around settlement equals to 15 % of pile tip diameter. Moreover, the screw piles having helix-to-shaft diameter ratio 2–4.1 showed 2–12 times higher end bearing capacity than straight pipe piles with similar pile shaft diameter. It was also observed from the test results that the end bearing capacity of single-helix screw pile was in average 16.25 % less than straight pipe pile with similar pile tip area and ground conditions irrespective of the effect of increasing overburden pressure.
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The first author acknowledges the Ministry of Education, Culture, Sports, Science and Technology (Monbukagakusho) of Japan for its support by providing the scholarship for this research.
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Adnan Anwar Malik formerly at Saitama University.
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Malik, A.A., Kuwano, J., Tachibana, S. et al. End bearing capacity comparison of screw pile with straight pipe pile under similar ground conditions. Acta Geotech. 12, 415–428 (2017). https://doi.org/10.1007/s11440-016-0482-4
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DOI: https://doi.org/10.1007/s11440-016-0482-4