周永明，刘建飞，徐伟斌

（浙江省建筑设计研究院，杭州310006）

 

［摘要］对顶压桩采用双曲线荷载传递函数拟合自平衡试桩上段桩的荷载-位移曲线，采用指数荷载传递函数拟合自平衡试桩下段桩的荷载-位移曲线。对抗拔桩采用双曲线荷载传递函数拟合自平衡试桩的荷载-位移曲线。通过若干工程实测数据验证了基桩上下段分别采用两种曲线函数拟合，能较好地描述自平衡试桩的荷载传递特性。拟合结果对比表明，通过最小二乘法原理求解Q-s曲线方程，具有较高的精确度，应用Excel表格可快速处理多条实测曲线，方法简单、实用。

［关键词］自平衡试桩;荷载传递函数;曲线拟合

中图分类号：TU-473-12文献标识码：A文章编号：1002-848X(2012)08-0111-03

 

Zhou Yongming, Liu Jianfei, Xu Weibin

(Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310006, China)

 

Abstract: For bearing piles, the loading-settlement curve for upper pile segment with OPT (O-cell pile testing) were fitted by hyperbolic load transfer function, and the loading-settlement curve for lower pile segment with OPT were fitted with exponential load transfer function. For pulling piles, the loading-settlement curve for upper pile segment with OPT were fitted by hyperbolic load transfer function. The numerical solution verified by several history engineering cases can be used to describe the loading-settlement characteristic of OPT effectively. The comparison of fitting result shows that equation by the least square method to solve the Q-s curve has high accuracy degree, and application of Excel spreadsheet can quickly deal with the measured curves.

Keywords: O-cell pile testing method;load transfer function;curve fitting

作者简介：周永明，教授级高级工程师，Email:9764zym@sina.com。

 

［1］龚维明，戴国亮，蒋永生，等. 桩承载力自平衡测试理论与实践［J］. 建筑结构学报，2002，23（1）：82-88.

［2］周永明，翁雁麟，益德清. 卵石层后压浆灌注桩承载力设计及试验分析［J］. 结构工程师，2008，24（4）：85-88.

［3］杨玲琴，周永明. 嵌岩灌注桩竖向承载力设计分析［J］. 浙江建筑，1999，93（4）：25-26.

［4］陈龙珠，陈欣尧，奚笑舟. 自平衡法试验上段桩荷载位移曲线的实用解析算法［C］//第八届桩基工程学术年会论文集，2007.

［5］蒋益平，杨敏，熊巨华. 自平衡试桩荷载沉降曲线的解析算法［J］. 岩石力学与工程学报，2006，25（S1）：3258-3264