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発表 VERTICAL BEARING MECHANISM OF PILES IN VOLCANIC ASH GROUND

作成年度 2010年度
論文名 VERTICAL BEARING MECHANISM OF PILES IN VOLCANIC ASH GROUND
論文名(和訳) 火山灰土における杭の鉛直支持機構に関する研究
論文副題
発表会 3rd International Conference on Problematic Soils(第3回特殊土に関する国際会議)
誌名(No./号数)
発表年月日 2010/04/07 ~ 2010/04/09
所属研究室/機関名 著者名(英名)
寒地地盤チーム江川 拓也(EGAWA Takuya)
寒地地盤チーム西本 聡(NISHIMOTO Satoshi)
寒地地盤チーム冨澤 幸一(TOMISAWA Kouichi)
抄録
In Japan、 pile foundations constructed on volcanic ash ground are usually designed based on specifications for sandy soil ground. However、 the mechanical characteristics of volcanic ash soil、 such as friability against confining pressure、 differ from those of sandy soil. Vertical loading and electric cone penetration tests were therefore conducted for foundation piles of bridges constructed on volcanic ash soil at 14 sites to confirm the vertical bearing mechanism of piles in volcanic ash soil.[*]Volcanic ash soil in Hokkaido can be roughly divided into pyroclastic fall deposit and pyroclastic flow deposit based on the type of eruption. Testing and verification showed that the skin friction f of piles in pyroclastic fall deposit developed in a manner equivalent to that of sandy soil、 but that in pyroclastic flow deposit it tended to decrease compared with that of sandy soil. A certain level of correlation was observed between the skin friction f of piles and cone-end resistance qt、 indicating potential application to design and construction management in the future.
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