竖向荷载作用下桩身压缩系数分析研究

Analysis of the Pile Compressibility under Load Transfer Under Vertical Loading Conditions

对比分析多个工程项目中实测桩身压缩系数与建筑桩基规范中给出的压缩系数,发现实际桩身压缩系数与规范值偏差较大,分析了影响桩身压缩系数的因素,通过引用竖向荷载作用下的单桩桩身轴力分布函数,推算出只与桩的长径比和端阻分担比相关的桩身压缩系数计算公式,为桩基设计和施工提供了一定的理论参考。

The pile head settlement consists of the compression value of pile shaft and the soil settlement at the pile tip.The coefficient of the pile shaft compressibility is a critical parameter of in determining the pile shaft compressibility.This paper compares the measured coefficients pile shaft compressibility with the values that recommended by the construction code.It is concluded that the measured values might significantly different from the code recommended values.Factors that affecting the coefficient of the pile shaft compressibility are evaluated and the vertical load transfer function along the pile shaft is introduced to estimate the coefficient of pile shaft compressibility using the ratio of pile length to diameter and ratio of pile head loading to tip loading.