生长曲线模型的改进及其应用

Improvement and Application of Growth Curve Model

为解决桩基承载力无拐点曲线的预测模型构建问题,对生长曲线模型进行了研究。目前常用的4种生长曲线模型不经过坐标原点,这与荷载趋近于0沉降趋近于0的客观规律不相符。为此,基于坐标平移对模型进行了适当改进,让曲线经过坐标原点,并通过对不同单桩的试桩资料进行数据拟合。研究结果表明:改进后模型的拟合精度普遍提高,其中改进后的Weibull模型相关系数的平均值高达0.999 8,并且其对应的折减系数比较符合实际情况;因此,推荐用该曲线模型预测单桩极限承载力。

In order to solve the problem of constructing prediction model of pile foundation without bearing point curve,the growth curve model was studied.The four commonly used growth curve models do not pass through the origin of the coordinates,which is inconsistent with the objective law that the load tends to zero and the settlement approaches zero.For this reason,based on coordinate translation,the model is properly improved,the curve passes through the origin of coordinates,and data fitting is performed on the test pile data of different single piles.The results show that the accuracy of the improved model is generally improved.The average value of the improved Weibull model correlation coefficient is as high as 0.999 8,and its corresponding reduction factor is more in line with the actual situation.Therefore,it is recommended to use this curve model to predict the ultimate bearing capacity of a single pile.