單樁水平承載力計算方法研究與工程實例分析
方云飛，孫宏偉，閆瑩
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方云飛，孫宏偉，閆瑩（北京市建筑設計研究院有限公司, 北京 100045）［摘要］針對《建筑樁基技術(shù)規(guī)范》（JGJ 94—2008）所采用的單樁水平承載力特征值Rha的計算方法，分析了不同計算參數(shù)對Rha計算值的敏感性。結(jié)果表明各計算參數(shù)均對Rha計算值有較大影響，尤其是樁側(cè)土水平抗力系數(shù)的比例系數(shù)m。根據(jù)兩個工程實例，分別對樁頂鉸接（或自由）和固接兩種情況進行了計算，并與實測結(jié)果進行了對比分析。結(jié)果表明在樁頂鉸接（或自由）情況下，單樁水平承載力特征值計算公式相對適中；樁頂固接情況下，該計算公式相對偏于不安全。［關(guān)鍵詞］樁基；單樁水平承載力特征值；敏感性分析；實例分析中圖分類號：TU473.1 文獻標識碼：A 文章編號：1002-848X(2013)01-0095-05Research on the calculation method of the horizontal bearing capacity for a single pile and analysis on engineering examplesFang Yunfei, Sun Hongwei, Yan Ying(Beijing Institute of Architectural Design, Beijing 100045, China)Abstract: According to the calculation method of characteristic value(Rha) of the horizontal bearing capacity for a single pile by Technical code for building pile foundations (JGJ 94—2008), the sensitivities of different parameters on the calculated values of Rha were analyzed. The results show that Rha will be influenced by the calculation parameters, especially the proportional coefficient(m) of the horizontal resistance coefficient of the soil. According to two engineering examples, two cases of the pile top connected with fixed and hinged(or free) were calculated, and comparative analysis of calculation results and measured data was done. The results show that calculation results of Rha for the pile top connected with hinged(or free) are relatively moderate, but calculation results of Rha for the pile top connected with fixed are relatively unsafe.Keywords: pile foundation; characteristic value of the horizontal bearing capacity for a single pile; sensitivity analysis; example analysis作者簡介：方云飛，碩士，工程師，注冊土木（巖土）工程師，Email：fangyunfei@126.com
