【摘要】：通過框筒結(jié)構(gòu)體系下變樁長CFG樁復(fù)合地基模型試驗(yàn),實(shí)測得到了其基底反力及變形特征并進(jìn)行了分析,得出了以下結(jié)論:(1)采用長樁強(qiáng)化核心筒區(qū)、短樁相對弱化外框架柱區(qū),核心筒與外框柱中間區(qū)域采用中等長度樁,在使用荷載水平下,基礎(chǔ)中軸線縱向撓曲為0.25‰,基礎(chǔ)對角線縱向撓曲為0.21‰。(2)在使用荷載水平下,核心筒區(qū)樁頂應(yīng)力明顯高于外框架柱區(qū),核心筒區(qū)樁頂應(yīng)力相對均勻,角樁最大,邊中樁次之,中心樁最小;核心筒區(qū)樁間土應(yīng)力與外框架柱區(qū)相差不大,整體上樁間土應(yīng)力分布較為均勻,3個分區(qū)的樁間土承載力均可充分發(fā)揮。(3)在使用荷載水平下,核心筒區(qū)基底反力最高,分布較為均勻,呈線性分布;核心筒區(qū)至外框柱區(qū)基底反力逐步衰減;外框柱區(qū)域基底反力最低,分布較為均勻,基本呈線性分布;基底反力總體上呈盆形分布,基底反力分布與復(fù)合模量相關(guān)性明顯,大致成線性關(guān)系。
[Abstract]:Through the model test of CFG pile composite foundation with variable pile length under frame-tube structure system, the reaction and deformation characteristics of the foundation are obtained and analyzed. The following conclusions are obtained: (1) the core tube area is strengthened by long pile. The short pile is relatively weak in the outer frame column area, the medium length pile is used in the middle area of the core tube and the outer frame column, and the longitudinal deflection of the central axis of the foundation is 0.25 鈥，

本文編號：2317251