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(中國建筑科學研究院地基基礎研究所,北京 100013)

［摘要］通過對帶承臺單樁、群樁模型試驗承載性狀的分析，說明帶承臺單樁的承載性狀與群樁的承載性狀并不完全相同，不能將帶承臺單樁的試驗結果簡單地推廣到群樁的設計計算中去。在帶承臺單樁試驗中，發(fā)現(xiàn)帶承臺單樁的極限承載力大于單樁與平板極限承載力之和而在復合群樁試驗中，復合樁基的極限承載力則大大小于各單樁與平板極限承載力之和。結合現(xiàn)場大型群樁模型試驗結果及現(xiàn)行規(guī)范闡述了復合樁基的承載性狀。

［關鍵詞］復合樁基；承臺效應；帶臺單樁；基底土反力

Research on composite pile foundation bearing capacity behaviorWang Tao(China Academy of Building Research, Beijing 100013, China)

Abstract:The bearing capacity behaviors of single pile with cap and group piles foundation  are analyzed in order to explain the differences between them.The bearing capacity test result of single pile with cap cannot be beought simply into group piles foundation design calculation. The ultimate bearing capacity of single pile with cap is larger than the sum of the ultimate bearing capacity of single pile and plate. While in composite group piles test, the conclusion that ultimate bearing capacity of composite pile foundation is smaller than the sum of ultimate bearing capacity of all single piles and plates is obtained.

Composite pile foundation bearing capacity behavior is explained by large scale model tests insite results and present standard.

Keywords:composite pile foundation; pile cap effect; foundation pile with the cap; subsoil back pressure

*建設部科技項目(0697-07-02)。