深水条件下超大直径钻孔灌注桩侧摩阻力计算修正  

Modification Calculation of Lateral Friction Resistance of Super Diameter Bored Pile Under Deep-Water Condition

作　　者：熊聪[1] 陈志坚[1] 

机构地区：[1]河海大学地球科学与工程学院,南京市210098

出　　处：《勘察科学技术》2015年第4期7-11,共5页Site Investigation Science and Technology

基　　金：国家"十一五"科技支撑资助项目(2006BAG04B05;2006BAG04B01)

摘　　要：目前经验法确定桩侧极限摩阻力大小在实际工程中应用广泛,因其使用方便,当实际情况与经验法中的情况相似时,计算结果的精度也是符合实际工程应用的。但对于深水环境下的超长大直径灌注桩则存在较大误差。通过3根超长大直径钻孔灌注试桩的自平衡法试验实测数据,分析桩侧摩阻力的传递规律,并与经验法参考值进行对比,对桩侧极限摩阻力的计算提出修正系数,并结合实例对修正结果验证。得出的修正结果更符合工程实际,对于工程设计具有很大的实际意义。Currently,calculating the limite lateral friction resistance of pile by experience method is used in practical engineering commomly. Because it is convenience,when the actual situation is similar with the experience method,the calculating accurancy also conforms to the practical engineering application. But there are big error when the method is used in super-long diameter bored pile in deep-water environment.Through the test data of three super-long diameter bored test pile by self-balanced method,the passing law of lateral friction resistance of pile is analysed,then the result is compared with the value got by experience method. The modified factor is put forward for calculating the lateral friction resistance of pile,and the modified result is vertified by the practical engineering. The modification results meets with the engineering practice better,and it has big practical significance for engineering design.

关 键 词：深水环境 超长桩 桩侧摩阻力 修正系数 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]