摘要
利用未达到破坏的现场静载试验数据确定抗拔桩极限承载力的问题,日益受到工程界的重视。应用适当的数学模型描述桩基荷载-位移关系确定其极限承载力,不失为一种经济适用的选择。结合东莞市实测的AB型管桩静载荷试验资料,对常用的描述抗拔桩荷载-位移曲线的非线性数学模型如双曲线模型、幂函数模型、指数函数模型和修正的GM(1,1)模型作了比较分析。结果表明,修正的GM(1,1)模型模拟的荷载-位移曲线精度最高,幂函数模型和指数函数模型次之,双曲线模型相对较差。建议在选用上述数学模型前,先采用实测数据对模型的适用性进行检验,在该类地基中AB型管桩荷载-位移关系的描述可采用修正的GM(1,1)模型。
The problem that how to get uplift bearing capacity of single pile through field data of non - destructive test on piles attracts more and more attention. Selecting proper mathematical models to depict load - displacement relationships for the piles to estimate their uplift bearing capacity could be a economical and usable choice. In combination with field data of in situ static load test of AB pipe piles in Dongguan city, several common predicting models used to depict load -displacement curves of uplift piles such as hyperbolic model, power function model, exponent function model and modified GM （ 1,1 ） are analyzed and contrasted in this paper. The results show that the modified GM（ 1,1） has the most satisfactory accuracy, while power function model and exponent function model are moderate in accuracy and hyperbolic model is relatively worse than the aforementioned ones. It is suggested that the mathematical models should be tested by field data before choosing proper ones, that using modified GM （ 1,1 ） to depict load - displacement curves of AB pipe piles in such ground could be a sound choice.
出处
《地下空间与工程学报》
CSCD
北大核心
2009年第4期735-739,共5页
Chinese Journal of Underground Space and Engineering
基金
广东省科技基金资助项目(2004B36001028)
关键词
单桩抗拔承载力
双曲线模型
幂函数模型
指数函数模型
GM(1
1)模型
uplift bearing capacity of single pile
hyperbolic model
power function model
exponent function model
GM （ 1,1） model
