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沉桩困难是打入式桩基施工中经常面临的主要问题之一。由于受到众多因素的影响,目前对沉桩难易程度的分析仍停留在定性分析的基础上[1],①,很难建立完善的数学模型对该问题进行定量分析计算。本文结合工程实践,利用静探指标建立了一定条件下计算预应力高强混凝土管桩(PHC桩)沉桩锤击数的经验公式,为该桩型沉桩难易程度分析提供一种定量的分析方法,从而为桩型和沉桩设备的选择提供较为可靠的依据。
Pile driving difficulty is one of the main problems often encountered in the construction of driving pile foundations. Due to many factors, the current analysis of the difficulty of pile sinking is still based on the qualitative analysis [1], ①, it is difficult to establish a complete mathematical model to quantitatively analyze the problem. Based on the engineering practice, the empirical formula for calculating the number of pile hammering of prestressed high strength concrete piles (PHC pile) under certain conditions is established by using the static exploration index, which provides a quantitative analysis for the difficulty analysis of the pile type pile sinking Method to provide a more reliable basis for the selection of pile type and pile driving equipment.