单桩水平静载试验结果数学拟合研究

基于福州盆地3根PHC管桩和2根冲孔灌注桩水平静载试验结果,对单桩水平荷载位移曲线进行数学拟合研究。研究发现,①冲孔灌注桩单桩水平荷载位移曲线呈双曲线和幂级数形态,PHC管桩呈直线形态;②对PHC管桩单桩水平荷载位移曲线直线模型拟合效果最优,基于该数学模型的桩顶水平荷载计算值与实测值的误差一般为-7.53%~20.74%,说明用直线模型针对PHC管桩水平荷载位移曲线的拟合是较为精确和可靠的;③双曲线模型和幂函数模型均能对冲孔灌注桩单桩水平荷载位移曲线进行合理拟合,基于双曲线模型的桩顶水平荷载计算值与实测值的误差一般为-10.99%~18.91%,基于幂函数模型的桩顶水平荷载计算值与实测值的误差一般为-16.03%~9.96%。

Based on the test results of horizontal static load for three PHC piles and two drop impact-cone concrete piles in Fuzhou Basin,a mathematical fitting study is carried out on the pile horizontal load displacement curve.The results show that： 1） The pile horizontal load displacement curve of drop impact-cone concrete piles is in hyperbolic and power series shape while the one of PHC piles is in linear shape.2） The fitting effect of linear model is the best for pile horizontal load displacement curve of PHC piles,and on the basis of such mathematical model,the error of calculated value and measured value for pile top horizontal load is generally between-7.53% to 20.74%,which means the fitting for horizontal load displacement curve of PHC piles is relatively accurate and reliable by means of linear model.3） The pile horizontal load displacement curve of drop impact-cone concrete piles can be reasonably fitted both through hyperbolic model and power function model.Based on the hyperbolic model,the error of calculated value and measured value for pile top horizontal load is generally between-10.99% to 18.91%,while based on power function model,the error of calculated value and measured value for pile top horizontal load is generally between-16.03% to 9.96%.