基于荷载传递法的后注浆桩荷载沉降关系预测

Load settlement relationship prediction for grouted pile based on load transfer function method

为了预测竖向荷载下后注浆桩的荷载变形特性,在荷载传递法的基础上,采用双曲线的荷载传递函数,推导了后注浆桩桩身荷载和沉降关系的迭代模型,给出了成层地基中后注浆单桩的迭代求解方法.为了考虑注浆对桩端桩侧阻力的影响,引入了后注浆荷载传递参数提高因子,在统计的基础上给出了提高因子的经验取值范围,最后通过一个工程实例评估了该方法的合理性.结果表明本文方法能较好地给出后注浆桩荷载沉降关系的范围,可以保守地将预测的下限用于设计.

To obtain a good prediction of the grouted pile behavior under vertical loads,an iteration method based on the hyperbolic load transfer function is developed to determine the load settlement relationship of the grouted pile in this paper.The calculation procedure for a single grouted pile in layered soil is presented.Four improvement factors are introduced to account for the effect of grouting on the side friction and end resistance.The empirical range of the improvement factor is also given based on statistical analysis.Finally,a case history is cited to indicate the validity of the presented method.The results show that the presented method can predict the range of load settlement relationship of the pile head well.It is suggested that the predicted lower bound can be used for a conservative design.