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　謝耀峰^1,2　王云球¹
?。? 河海大學(xué)交通與海洋工程學(xué)院  南京210098；2 東南大學(xué)港口航道工程系  南京210096）

[提要]  結(jié)合湛江港某碼頭基樁工程，對(duì)樁的負(fù)摩擦力進(jìn)行試驗(yàn)研究。研究表明由同一根樁所測(cè)得的下拉荷載值遠(yuǎn)小于上拔荷載值。樁的負(fù)表面摩擦力在泥面以下約L/5左右處達(dá)到最大。摩擦樁的中性點(diǎn)位置多在0.67L處。建議的單樁下拉荷載經(jīng)驗(yàn)公式，可供工程計(jì)算參考使用。
[關(guān)鍵詞]  負(fù)摩擦力  下拉荷載  中性點(diǎn)

The test of negative skin friction along the single pile is studied,which is modeled after piles of　Zhanjiang harbor.The influence on negative skin friction along the various piles is discussed.The　mechanism and some new work laws of negative skin friction along the single pile or wharf bent piles are analyzed. The place of the maximum negative surface friction is L/5 0r so in soil. The neutral point of the friction pile is 0.67L or so in soil. An improved empirical formula is put forward for the calculation of the negative skin friction,which can be referred in project designing.
Keywords:  negative skin friction; downdrag force; neutral point

    　參  考  文  獻(xiàn)
1．王云球，湛江港－區(qū)南二期工程樁基負(fù)摩擦力模型試驗(yàn)報(bào)告．河海大學(xué)，1996．
2．Auvinet G, Jhanell J. Negative skin friction on piles in Mexico city clay.ln:Proc.llth ICSMFE,1981,Ⅲ．
3．Endo M, Kawasaki T, Shibata T.  Negative skin friction acting on steel pipe in clay. In:  Proc. 7th ICSMFE, 1969,Ⅱ．