大直径管桩沉桩过程中溜桩判断方法研究

发布时间：2018-05-25 05:23

  本文选题：溜桩 + 动侧摩阻　； 参考：《中国石油大学学报(自然科学版)》2016年02期

【摘要】：海洋工程中大直径管桩沉桩过程中常会出现溜桩现象,未经预料的溜桩会引起很多严重的工程问题,有必要对溜桩段进行准确判断。结合实际工程对溜桩产生及停止的机制进行分析;通过研究沉桩过程中桩周土体强度折减及超孔压的作用,提出动贯入阻力的计算方法;利用功、能原理对溜桩过程中所发生的能量转化进行分析,并推导相应计算公式,结合动贯入阻力计算方法,实现对溜桩过程的预测。结果表明,当桩端进入深厚砂土层或动侧摩阻力达到一定值时溜桩将逐渐停止,若是后者则再次打桩后不再发生溜桩现象。计算动侧摩阻时须考虑沉桩过程中扩孔效应和循环荷载作用。计算结果与现场实测数据吻合较好。
[Abstract]:In the process of large diameter pipe pile sinking in ocean engineering, pile slip often occurs, and unexpected slide pile will cause a lot of serious engineering problems. It is necessary to accurately judge the slide pile section. Combined with practical engineering, this paper analyzes the mechanism of producing and stopping of slide pile, puts forward the calculation method of dynamic penetration resistance by studying the effect of soil strength reduction and excess pore pressure in pile driving process, makes use of work, The energy principle is used to analyze the energy transformation in the pile slide process, and the corresponding calculation formula is deduced. The prediction of the pile slide process is realized by combining the dynamic penetration resistance calculation method. The results show that when the pile ends into the deep sand layer or the frictional resistance of the moving side reaches a certain value, the sliding pile will stop gradually, and if the latter pile is driven again, the phenomenon of sliding pile will not occur again. In calculating the frictional resistance of the moving side, the effect of hole expansion and cyclic load should be considered in the process of piling. The calculated results are in good agreement with the field measured data.
【作者单位】： 天津大学水利工程仿真与安全国家重点实验室;天津大学建筑工程学院;
【基金】：国家自然科学基金项目(41402263) 天津市自然科学基金重点项目(13JCZDJC35300)
【分类号】：TU753.3;P75
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本文编号：1932270