Computational method for end resistance of large-diameter ultra-long piles during pile sliding
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摘要: 随着超大直径单桩基础在海洋工程中的广泛应用,在超大的桩锤重量作用下,使得沉桩过程中溜桩现象频发。工程经验表明,溜桩过程中,桩侧摩阻力的发挥程度很小,所以对溜桩区间的判断主要取决于对桩端阻力的评估。溜桩现象主要发生在黏性土层中,因此以对黏性土层桩端阻力的计算是至关重要的。针对某平台桩基沉桩过程中的溜桩问题进行了分析计算,比较黏性土层中桩端阻力的计算方法,提出计算溜桩问题中的黏土桩端阻力的方法并验证了其合理性,可供桩基设计以及沉桩施工参考。Abstract: The large-diameter ultra-long piles are commonly adopted for constructing ocean platform foundations. The pile-sliding phenomenon frequently takes place because of the great weight of both the piles and the hammer. Engineering experience shows that during the process of pile sliding the shaft friction represents a very small representative of soil resistance. So the prediction of the area of pile sliding depends on the end resistance of soft clay. The mechanism of pile sliding is discussed. Different methods for estimating the end resistance during pile sliding are compared associated with practical engineering. A procedure for calculating the soil resistance is put forward. It is used to predict the end resistance of piles during pile sliding in a project. The calculated results agree well with the observed data, indicating that the proposed method may be helpful to the pile foundation designers in ocean engineering.
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Keywords:
- pile penetration /
- pile sliding /
- bearing capacity /
- clay end resistance /
- side loading effect
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