EFFECT OF TIP LENGTH AND STRENGTH OF ENLARGED GROUTED BASE ON BEARING CAPACITY OF STRAIGHT PILE

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  • ISHIKAWA Kazuma
    Graduate School of Science and Engineering, Kansai University, JAPAN PILE Corporation, M. Sci.
  • ITO Atsushi
    Assoc. Prof., Dept. of Architecture, Faculty of Environmental and Urban Engineering, Kansai University, Dr. Eng.
  • OGURA Hitoshi
    JAPAN PILE Corporation, Dr. Eng.

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Other Title
  • 根固め部の下方長さと強度がストレート杭の支持力特性に与える影響
  • 根固め部の下方長さと強度がストレート杭の支持力特性に与える影響 : 埋込み杭の拡大根固め部に関する模型実験(その2)
  • ネガタメ ブ ノ カホウ ナガサ ト キョウド ガ ストレート クイ ノ シジリョク トクセイ ニ アタエル エイキョウ : ウメコミ クイ ノ カクダイ ネガタメ ブ ニ カンスル モケイ ジッケン(ソノ 2)
  • —Model tests on enlarged grouted base of bored precast pile Part 2—
  • －埋込み杭の拡大根固め部に関する模型実験　その2－

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Description

Vertical loading tests were performed on the bearing capacity of straight pile with enlarged grouted base using pressurized sand tank for studying the effects of the tip length and the strength of enlarged grouted base. The main conclusions are as follows. 1) When the tip length was zero, “bond failure” occurred in the early stage of loading regardless of the strength, and the pile head load reduced abruptly. 2) When the tip length was 0.83 times the pile diameter and the strength was 15 N/mm2, “punching failure” finally occurred, but the same bearing capacity was obtained as in the case when the tip length was 1.3 times the pile diameter. 3) When the tip length was 1.3 times the pile diameter, and the strength was 15 N/mm2, no “punching failure” occurred, and the pile head load continued to increase until the completion of loading.

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