Effects of inner sleeves on the inner frictional resistance of open-ended piles driven into sand

Abstract

In open-ended piles, inner friction is developed between inner pile shaft and the inner soil. Inner frictional resistance depends largely on the degree of soil plugging, which is influenced by many factors including pile diameter, relative density and end conditions of piles. In this paper, effects of inner sleeves on inner frictional resistance are discussed. The experiments were conducted on a medium-dense sandy ground using laboratory-scale piles. It was observed that the piles penetrated under partially-plugged or unplugged state. The results suggest that inner frictional resistance, Q_in increases with sleeve height, l linearly and requires 2D (D is pile outer diameter) of l to produce a large as 50% of Q_t by Q_in (Q_t is total resistance). The results also indicate that bearing capacity increases with wall thickness at the pile tip, which can be attributed to the increase in annular area. The results also indicate that soil plug height is independent of sleeve height. The results also reveal that the penetration of straight piles is closer to unplugged state than the sleeved piles. The results of incremental filling ratio and plug length ratio also indicate that the degree of soil plugging is affected by the sleeve height.

Keywords

bearing capacity / inner frictional resistance / inner sleeve / open-ended piles / soil plugging

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Acknowledgements

The financial assistance given to the first author through a President Postdoctoral Fellowship by Tokyo University of Science, Japan is highly appreciated. The financial supports provided by The Japan Iron and Steel Federation (JISF) and International Press-in Association (IPA) are also acknowledged.

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2016 Higher Education Press and Springer-Verlag Berlin Heidelberg