單樁豎向極限承載力及其特征值計算方法研究
王澤根， 石小帆
- 摘 要
-
王澤根， 石小帆(西南石油大學(xué)土木工程與建筑學(xué)院，成都 610500)[摘要] 通過對現(xiàn)行《建筑樁基技術(shù)規(guī)范》(JGJ 94-2008)和《建筑地基基礎(chǔ)設(shè)計規(guī)范》(GB 50007-2011)中估算單樁豎向承載力特征值計算方法的對比分析，認為于預(yù)制樁、鋼管樁及大直徑灌注樁（清底干凈）的情況取2為安全系數(shù)是適合的。但是，對于其他成樁工藝或特殊樁周土的情況，由于單樁極限承載力及其特征值的對應(yīng)關(guān)系發(fā)生變化，籠統(tǒng)地用安全系數(shù)2進行設(shè)計計算并不恰當(dāng)，提出用特征值分項系數(shù)y’來代替安全系數(shù)2，結(jié)合工程實例分析驗證了所提方法的合理性。[關(guān)鍵詞] 單樁豎向極限承載力；特征值；靜載試驗法；負摩阻力中圖分類號：TU470+．3 文獻標識碼：A 文章編號：1002-848X(2012) S2-0504-03A calculation method of single pile vertical load capacity and eigenvalueWang Zegen, Shi Xiaofan(School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu 610500, China)Abstract: By the comparative analysis of a calculation method about the single pile vertical load capacity in the existing Technical code for building pile foundations (JGJ 94-2008) and Code for design of building foundation( GB 50007-2011), we think in precast piles and steel pipe and piles oflarge diameter( clean bottom clean) take 2 for safety coefficient is suitable. For other piling technology or special pile soil condition, because the corresponding relationship between the vertical load capacity of single pile and its eigenvalue has changed, in general terms, it is not appropriate to design and calculate with safety coefficient 2.Put forward by the partial factor of eigenvalue y’ to replace safety coefficient 2, and combined with the engineering examples to verify the rationality of the proposed method.Keywords: vertical load capacity of single pile; eigenvalue; static load test method; negative friction resistance
