摘要
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。
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-beating friction pile in deep soft clay is studied, and the transferring law of axial force in long bored end-beating 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.
出处
《建筑结构》
CSCD
北大核心
2006年第4期40-42,76,共4页
Building Structure
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
end-beating friction pile
long bored pile
deep soft clay
the transferring law of axial force
