鋼管ぐいの閉塞効果と支持力機構(その1)

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書誌事項

タイトル別名
  • PLUGGING EFFECT AND BEARING MECHANISM OF STEEL PIPE PILE (PART-1)
  • 鋼管ぐいの閉塞効果と支持力機構-1-
  • コウカングイ ノ ヘイソク コウカ ト シジリョク キコウ 1
  • Plugging effects and bearing mechanism of steel pipe piles

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抄録

Pipe piles are generally driven with their ends open and insides of them are consequently filled with soil. Up to this time, it has been regarded as a important problem whether the soil, filled inside of pile, gives enough plugging effect or not. The soil, filled inside of pile, does not always form a complete plug against the subgrad reaction at the top of pile. The plugging effect is mainly arised by the resistance acted against the movement of soil along the inner surface of pile. In the case of granular soil, the resistance is regarded as a frictional force between pile surface and soil, but when the soil is cohesive, the resistance is looked upon as the interaction shear force acted along the slide plane close to the pile wall. Then the bearing capacity standing by the inner soil can theoretically be calculated from the solutions of differential equations which are the function of gravity, cohesion, angle of internal friction and coefficient of lateral pressure of soil, coefficient of friction between pile and soil, diameter of pile and depth of soil filled within the pile. By the theoretical works described on this paper, a general mechanism of plugging effect was made clear and these theoretical estimates are shown in good agreement with the observed practical data. As the result of several discussions, please take notice especially of the fact that the diameter of pile have an remarkable effect on the formation of plug. The larger the pile diameter is, the deeper penetration is required to obtain the beneficial plugging effect. The experiential fact that granular soil is much effective to the formation of plug than cohesive soil is also quantitatively estimated by this solution. It is hoped that this study will be very useful enough not only for the economical and secure design of pile foundation but also for the analytical work on pile bearing mechanism.

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