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有效桩长的定义有基于承载力角度和沉降角度两种方法,由于影响因素的多样性,有效桩长的研究比较复杂。运用桩顶刚度控制法确定有效桩长。基于Winkler地基模型,以荷载传递法为工具,推导出双层土的桩顶刚度计算公式,并对有效桩长影响因素进行了分析。结果表明,桩径的增大有效桩长增加;土层刚度比(第二层土刚度与第一层土刚度之比)增大有效桩长减小;桩端刚度的增大对有效桩长的影响都不明显,第一土层厚度的增加在一定范围内对提高有效桩长是有用的。
The definition of effective pile length is based on the bearing capacity and settlement angle of two methods, due to the diversity of factors, the effective length of the pile is more complicated. Applying pile top stiffness control method to determine effective pile length. Based on the Winkler foundation model, the load-transfer method is used as a tool to derive the formula of the pile top stiffness of double-layered soil, and the influencing factors of the effective pile length are analyzed. The results show that the effective pile length increases with the increase of pile diameter, and the effective pile length decreases when the stiffness ratio of soil layer (the ratio of the second layer of soil stiffness to the first layer of soil rigidity) increases. Is not obvious. The increase of the thickness of the first soil layer is useful to improve the effective pile length within a certain range.