自平衡法試樁的荷載-位移曲線的數(shù)值解法
周永明，劉建飛，徐偉斌
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周永明，劉建飛，徐偉斌（浙江省建筑設(shè)計(jì)研究院，杭州310006）［摘要］對頂壓樁采用雙曲線荷載傳遞函數(shù)擬合自平衡試樁上段樁的荷載-位移曲線，采用指數(shù)荷載傳遞函數(shù)擬合自平衡試樁下段樁的荷載-位移曲線。對抗拔樁采用雙曲線荷載傳遞函數(shù)擬合自平衡試樁的荷載-位移曲線。通過若干工程實(shí)測數(shù)據(jù)驗(yàn)證了基樁上下段分別采用兩種曲線函數(shù)擬合，能較好地描述自平衡試樁的荷載傳遞特性。擬合結(jié)果對比表明，通過最小二乘法原理求解Q-s曲線方程，具有較高的精確度，應(yīng)用Excel表格可快速處理多條實(shí)測曲線，方法簡單、實(shí)用。［關(guān)鍵詞］自平衡試樁;荷載傳遞函數(shù);曲線擬合中圖分類號(hào)：TU-473-12文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2012)08-0111-03Numerical method of loading-settlement curve under O-cell pile testing methodZhou 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作者簡介：周永明，教授級(jí)高級(jí)工程師，Email:9764zym@sina.com。參考文獻(xiàn)［1］龔維明，戴國亮，蔣永生，等. 樁承載力自平衡測試?yán)碚撆c實(shí)踐［J］. 建筑結(jié)構(gòu)學(xué)報(bào)，2002，23（1）：82-88.［2］周永明，翁雁麟，益德清. 卵石層后壓漿灌注樁承載力設(shè)計(jì)及試驗(yàn)分析［J］. 結(jié)構(gòu)工程師，2008，24（4）：85-88.［3］楊玲琴，周永明. 嵌巖灌注樁豎向承載力設(shè)計(jì)分析［J］. 浙江建筑，1999，93（4）：25-26.［4］陳龍珠，陳欣堯，奚笑舟. 自平衡法試驗(yàn)上段樁荷載位移曲線的實(shí)用解析算法［C］//第八屆樁基工程學(xué)術(shù)年會(huì)論文集，2007.［5］蔣益平，楊敏，熊巨華. 自平衡試樁荷載沉降曲線的解析算法［J］. 巖石力學(xué)與工程學(xué)報(bào)，2006，25（S1）：3258-3264
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