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（浙江城建設(shè)計(jì)研究院 杭州  310006）
【提要】 通過五組支承于中風(fēng)化巖的不同直徑、不同長徑比的鉆孔灌注長樁的現(xiàn)場(chǎng)試驗(yàn)實(shí)測(cè)資料，分析了在厚淤泥質(zhì)土層中端承摩擦型鉆孔樁在垂直荷載作用下的工作原理，探討了端承摩擦型鉆孔灌注長樁荷載的傳遞規(guī)律，認(rèn)為對(duì)支承于中風(fēng)化巖的長徑比為60～80的鉆孔灌注樁在荷載較小時(shí)表現(xiàn)為摩擦型，荷載水平較高時(shí)表現(xiàn)為端承摩擦型。樁側(cè)摩阻力的發(fā)揮先上后下。為了有效控制沉降，建議采用樁底后注漿工藝。
【關(guān)鍵詞】 端承摩擦型 鉆孔灌注長樁 厚淤泥土層 荷載傳遞規(guī)律
Experiment Research on Long Bored Pile Bearing on Media Decayed Rock/Chen Ciping，Ye Jun，Zhu Zhixiong，Lou Donghao(Zhejiang Chengjian Academy，Hangzhou  310006,China)
Abstract:Based on the insitu test data of five bored piles with different diameter and
length bearing on media decayed rock,the working condition of end bearing friction pile in deep soft clay is studied, and the transferring law of axial force in long bored endbearing friction pile is discussed.For bored pile with lengthdiameter ratio of 60～80,it served as friciton pile at low load level and endbearingfriction pile at high load level.With the load developing,the lateral friction on the top pile reaches the limiting strength earlier than that on the bottom.To reduce the settlement,postgrouting technique is suggested.
Keywords:endbearing friction pile;long bored pile; deep soft clay; the transferring law of axial force