Influence of Pile Plugging on Skin Friction in Overconsolidated Clay
Influence of Pile Plugging on Skin Friction in Overconsolidated Clay
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DOI：
10.1061/(asce)1090-0241(1997)123:6(525
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发表时间：
1997-06
影响因子：
3.9
通讯作者：
G. Miller;A. Lutenegger
中科院分区：
文献类型：
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作者：
G. Miller;A. Lutenegger
通过现场试验研究了超固结粘土中桩的安装方式和土塞程度对轴向静载下沿着挤土桩侧摩阻力的影响。该研究在阿默斯特的马萨诸塞州大学的国家岩土工程试验场进行，包括安装和测试44根直径为60至168 mm、埋置长度为1.5至10.7 m的管桩。桩的安装方法包括打入和顶进。一些桩安装有60°锥尖，而另一些桩安装为开口端。试验结果表明，安装方法对开口桩的土塞量有很大的影响。此外，还发现桩的安装方法和堵塞程度显著影响由此产生的轴向压缩侧摩阻力。结果表明，桩侧摩阻力的封堵效应是由桩身沿着方向的侧向应力差异引起的，而安装方法的影响则与安装扰动有关。本文提出了一种有效应力分析法来估算桩侧摩阻力极限值，该方法考虑了安装方法和堵头对桩承载力的影响。
Field tests were conducted to investigate the influence of the method of installation and degree of soil plugging on the skin friction developed along displacement piles subjected to static axial loading in overconsolidated clay. The study was conducted at the National Geotechnical Experimentation Site at the University of Massachusetts in Amherst and included the installation and testing of 44 pipe piles with diameters ranging from 60 to 168 mm and embedment lengths ranging from 1.5 to 10.7 m. The methods of pile installation included both driving and jacking. Some piles were installed with 60° apex cone tips while others were installed open ended. Results of the test program indicated that the method of installation had a significant influence on the amount of soil plugging in open-ended piles. In addition, it was found that the pile installation method and degree of plugging significantly affected the resulting axial compressive skin friction. It is suggested that the plugging effect on skin friction results from differences in lateral stresses that develop along pile shafts, while the effect of the installation method is related to installation disturbance. An effective stress method of analysis is proposed for estimating ultimate pile skin friction taking into consideration the influence of installation method and plugging on pile capacity.