引用本文:
【打印本页】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览次   下载 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Research on prediction of pile running during large diameter pipe piles driving
SUN Liqiang1,2, JIA Tianqiang1,2, YAN Shuwang1,2, JIA Zhaolin1,2
(1.State Key Laboratory of Hydraulic Engineering Simulation and Safety in Tianjin University, Tianjin 300072, China;2.Institute of Architecture and Engineering in Tianjin University, Tianjin 300072, China)
Abstract:
In ocean engineering, pile running often occurs during the driving process of large diameter pipe piles. Unpredicted pile running will cause severe consiquences, so an accurate prediction is necessary. The generating and stopping mechanisms of pile running in practical engineering were analyzed. The computing method of dynamic resistance was proposed by researching the strength reduction of soil and the excess pore pressure around the pile. Using the principle of work and power, the transformation of energy was analyzed during pile driving, and the corresponding equations were derived. Combining with the computing method of dynamic resistance, the prediction for the process of pile running was realized. It turns out that the pile running will stop when the pile tip goes into a thick layer of sand or the skin friction reaches a certain high value. If the later situation occurs, the pile running won 't happen again. When calculating the skin friction, the effects of pore expansion and cyclic loading must be considered. The calculated results agree well with the measured ones.
Key words:  pile running  dynamic skin friction  reduction of strength  pore pressure  remolding strength