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 (1 上海綠地集團(tuán)南京房地產(chǎn)事業(yè)部，南京 210009; 2 東南大學(xué)土木工程學(xué)院，南京 210096)

［摘要］近年來擴(kuò)底樁用于建筑物抵抗上拔荷載作用的情況日趨增多，而對擴(kuò)底抗拔樁的理論研究遠(yuǎn)跟不上工程實踐的發(fā)展。分析了擴(kuò)底抗拔樁的抗拔機(jī)理和常用的破壞模式，在合理假定的基礎(chǔ)上給出了一種擴(kuò)底嵌巖樁極限抗拔承載力的計算模式，該模式包含側(cè)摩阻力、樁自重以及擴(kuò)大頭抗拔力對總抗拔承載力的貢獻(xiàn)。結(jié)合南京綠地廣場紫峰大廈工程中兩根擴(kuò)底嵌巖抗拔樁的自平衡法極限抗拔承載力試驗結(jié)果，進(jìn)行了該模式計算值與實測值的對比分析，吻合程度較好。

［關(guān)鍵詞］擴(kuò)底嵌巖抗拔樁；極限抗拔承載力；計算模式

Study on bearing capacity of rock-embeded under-reamed uplift pilesWu Mingang¹, Dai Yongxing², Dai Guoliang², Gong Weiming²(1 Nanjing State-owned Assets & Greenland Financial Center Co., Ltd., Nanjing 210009, China;2 College of Civil Engineering, Southeast University, Nanjing 210096, China)

Abstract:Under-reamed piles are used more and more in building structures to resist uplift loading recently, but the theoretic study of under-reamed piles is far behind their application in construction. Failure mechanism and common failure model of under-reamed pile are studied and a theoretical model is proposed to calculate the ultimate uplift bearing capacity of rockembeded under-reamed piles. Lateral friction, gravity of the pile and resistance of expansion head are contained in this model. Combined with two piles in the project of Zifeng Plaza in Nanjing, the calculation results and the test data are compared, and they meet well.

Keywords:rock-embeded under-reamed uplift piles；ultimate uplift bearing capacity; calculation model

*建設(shè)部研究開發(fā)項目(06-K1-09)資助。