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（1 浙江工業(yè)大學建筑工程學院，杭州 310032；    2 浙江大學建筑設計研究院，杭州 310027）

［摘要］對一個雙盤模型支盤樁在非飽和粉土中進行了5次循環(huán)加載卸載試驗。試驗證明：支盤樁在小于其極限承載力約0.75倍的重復荷載作用下變形增加很小，工作性能十分穩(wěn)定；支盤樁與普通等直徑樁相比，其承載力和抗變形能力十分優(yōu)越；支盤樁的荷載傳遞機理十分復雜，盤附近土體對樁周的摩擦阻力在不同荷載作用下有時為正有時為負；當兩盤的間距小于2D（D為盤直徑）時，樁周的摩擦力對樁的承載力貢獻很小，在每次重復荷載作用下，盤間土體都會經(jīng)歷加壓和卸壓的過程，卸載后土體會建立新的平衡和物理性質(zhì)工作狀態(tài)。研究表明，支盤樁應用于橋梁等承受重復荷載的結構是可行的。

［關鍵詞］支盤樁；模型試驗；重復荷載；荷載傳遞機理

Test study on model piles with branches and plates under repeatedly load

Meng Fanli 1, Wu Jie 2, Lu Chengyuan 1

(1 College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310032, China;

 2 Architectural Design and Research Institute of Zhejiang University, Hangzhou 310027, China)

Abstract:A model test was done to analyze the bearing capacity behavior and deformation behavior of the piles with branches and plates under repeated load. It is proved that: the deformation increment of the pile is small and working behavior is very stable when the load is less than 3/4 of limit bearing capacity; the bearing capacity and resistance of deformation are better compared with equal diameter pile; the load transfer mechanism of the pile with branches and plates is really complex, and the skin friction of the silt around the plates is positive or minus under different loads; when the distance of plates is less than 2D, the contribution of skin friction to bearing capacity is very small, and under each repeated loading, the silt between plates would go through the process of load bearing and load shedding. It is showed that pile with branches and plates could be used in bridge engineering  under repeated load.

Keywords:pile with branches and plates; model test; repeated load; loading transfer mechanism

*浙江省自然科學基金項目（502117）。