桩极限承载力的Usher模型预测  

Prediction of ultimate bearing capacity of piles based on Usher model

作　　者：蒋建平[1] 刘文白[1] 高广运[2] 

机构地区：[1]上海海事大学海洋环境与工程学院,上海201306 [2]同济大学土木工程学院,上海200092

出　　处：《江苏大学学报（自然科学版）》2009年第5期528-531,共4页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50678128);上海市教委科研项目(05FZ03)

摘　　要：为深化对桩承载性能的认识,选用生物领域的Usher生长曲线模型,对桩的桩顶荷载-桩顶沉降曲线(即Q-s曲线)进行拟合,并对其极限承载力进行预测.给出了Usher模型的建立与求解,并用于分析3根试桩(包括2根灌注桩、1根钢管桩)的实测资料.结果表明:Usher模型对3种类型的Q-s曲线有高的拟合精度;该模型拟合效果优于双曲线模型,特别是在曲线的末端;利用这些拟合方程式能对3种桩的极限承载力进行预测.In order to enhance the understanding of piles bearing behaviors, Usher mathematical model in biological field was selected to fit load-settlement curves （ i. e. Q - s curves ） of piles and the ultimate bearing capacity of piles was predicted. Estabilishment and solution of Usher model were completed, and this model was used to analyze field load testing data of 3 types piles （ including 2 cast-in-place piles and 1 steel pipe pile）. The results show that the fitting precision of Q -s curves is high. The fitting effect of the model is better than that of the hyperbolic model, especially at the end of curves. These corresponding fitting equations can be used to forecast the ultimate bearing capacity of piles.

关 键 词：桩 数学模型 承载力 预测 曲线拟合 

分 类 号：TU473[建筑科学—结构工程]