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本文根据微型桩的动力试验结果,提出了用桩在土下频率变化点的位置来确定桩的动力计算长度的方法,得出了悬臂长桩的动力计算长度的经验计算式和一阶自振频率的近似计算式,并用大型钢管桩的现场实测结果进行了校验,计算结果和现场现测结果能很好的吻合,同时指出了用由静力法得出的所谓“弹性嵌固点”来进行动力分析是不合适的。
In this paper, based on the dynamic test results of micro-piles, a method of determining the dynamic calculation length of piles by using the position of the pile changing frequency at subsoil is proposed. The empirical calculation formula of dynamic calculation length of cantilever long piles and the first- Frequency approximation formula, and with the large-scale steel pipe pile field test results were verified, the calculated results and the field measured results can be a good match, also pointed out by the static method derived from the so-called “ ”To carry out dynamic analysis is not appropriate.