扩底桩上拔荷载-位移曲线的Richards模型拟合研究  

APPLICATION OF RICHARDS MODEL IN THE FITTING OF UPLIFT LOAD VERSUS UPLIFT DISPLACEMENT CURVE OF BELLED PILE

作　　者：蒋建平[1] 高广运[2] 刘文白[1] 

机构地区：[1]上海海事大学海洋环境与工程学院,上海200135 [2]同济大学土木工程学院地下系,上海200092

出　　处：《工程力学》2009年第5期189-196,201,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(50678128);上海市教委科研项目(05FZ03);上海市教委科研创新项目(09YZ250)

摘　　要：基于8个场地中共23根现场试验桩的实测资料,对扩底桩上拔荷载-上拔位移曲线进行了优化的拟合分析。针对抗拔扩底桩的承载特性,选用了生物领域的Richards数学模型。对23根现场试验桩的拟合表明,Richards模型的拟合精度高,相关系数R为0.97311―0.99942,平均0.99188;该模型对抗拔扩底桩的拟合效果比双曲线模型的要好;基于该数学模型的扩底桩上拔荷载的计算值与实测值的误差一般为±2.104%。结果表明:该文选用的Richards数学模型针对抗拔扩底桩上拔荷载-上拔位移曲线的拟合是较为精确的和可靠的。Based on actual measurement data of 23 field testing piles in 8 sites, an optimized fitting analysis of uplift load versus uplift displacement curves was carried out. According to the bearing characteristics of belled piles, Ricbards mathematical model, which was applied in biology, was selected to perform the fitting analysis. The fitting results of 23 field testing piles showed that the fitting has high precision with the correlation coefficient R being 0.99188 averagely, ranging from 0.97311 to 0.99942. The fitting effect was better than that of the hyperbolic model. Based on fitting equations, the calculated uplifting load has an error of ±2.104% comparing with measurements. The Richards mathematical model is accurate and feasible for the fitting of uplift load versus uplift displacement curves of belled piles.

关 键 词：Richards数学模型 上拔荷载-上拔位移曲线 抗拔扩底桩 现场桩试验资料 拟合 

分 类 号：TU473[建筑科学—结构工程]