埋込み杭の先端拡大根固め球根の鉛直支持性能に関する模型実験

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書誌事項

タイトル別名
  • MODEL TESTS ON VERTICAL BEARING PERFORMANCE OF ENLARGED BASE BULB OF BURIED PILES
  • ウメコミ クイ ノ センタン カクダイ ネガタメ キュウコン ノ エンチョク シジ セイノウ ニ カンスル モケイ ジッケン

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説明

A series of vertical load tests are performed on enlarged base bulbs of buried pile embedded in a large soil chamber to investigate the behavior of the pile base under vertical load until the ultimate condition. To measure axial load distribution in the pile a set of strain gages are installed at the top and the bottom of 114mm diameter double steel tube modeling a precast concrete pile. The effects of the size and the shape of the bulb consisting of soil cement are investigated to find the optimum configurations of the bulb. After the load test the base bulbs are excavated to examine the fracture pattern. It is found that the load carrying performance after full mobilization of friction between the pile shaft and the bulb depends deeply on the length of the bulb below the pile base.

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