（浙江城建设计研究院 杭州  310006）
【提要】 通过五组支承于中风化岩的不同直径、不同长径比的钻孔灌注长桩的现场试验实测资料，分析了在厚淤泥质土层中端承摩擦型钻孔桩在垂直荷载作用下的工作原理，探讨了端承摩擦型钻孔灌注长桩荷载的传递规律，认为对支承于中风化岩的长径比为60～80的钻孔灌注桩在荷载较小时表现为摩擦型，荷载水平较高时表现为端承摩擦型。桩侧摩阻力的发挥先上后下。为了有效控制沉降，建议采用桩底后注浆工艺。
【关键词】 端承摩擦型 钻孔灌注长桩 厚淤泥土层 荷载传递规律
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