- 摘 要
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（1 南通大學(xué)交通學(xué)院，南通 226019；2 東南大學(xué)土木工程學(xué)院，南京 210096；3 河海大學(xué)港口海岸與近海工程學(xué)院，南京 210098）
［摘要］通過群樁負(fù)摩擦力室內(nèi)模型試驗(yàn)，探討負(fù)摩擦力的群樁效應(yīng)。結(jié)果表明：樁身軸力隨著土載的增大而逐步增大，砂土固結(jié)完成后，隨土載增大樁中性點(diǎn)位置逐步下移，最終基本位于距樁頂0.8～0.9倍樁長處；負(fù)摩擦力群樁效應(yīng)系數(shù)隨著樁間距的增大而增大，當(dāng)樁間距達(dá)到6倍的樁外徑時(shí)，群樁效應(yīng)系數(shù)接近1.0。
［關(guān)鍵詞］負(fù)摩擦力; 群樁效應(yīng)系數(shù); 模型試驗(yàn)
中圖分類號(hào)：TU473.1 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2014)17-0072-03
Experimental study on the group piles effect coefficient of negative skin friction in sand
Miao Yun1, Dai Guoliang2, Huang Ting3
(1 Transportation College, Nantong University, Nantong 226019, China; 2 Department of Civil Engineering, Southeast University, Nanjing 210096, China; 3 College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China )
Abstract: The group piles effect of negative skin friction was discussed through the indoor model test. Results show that axial force of the pile increases gradually with the increase of the soil load. After the concretion of the soil, the location of the neutral point of the pile moves down gradually with the increase of the soil load and locates in the 80% to 90% of the total pile length from the pile top eventually. The group piles effect coefficient of negative skin friction increases with the increase of pile spacing and it is close to 1.0 when the pile spacing reaches as long as 6 times of the pile outer diameter.
Keywords: negative skin friction; group pile effect coefficient; model test
*國家科技支撐計(jì)劃項(xiàng)目（2011BAG07B01），973計(jì)劃資助項(xiàng)目（2013CB036304）。
作者簡介：繆云，碩士，助教，Email：miaoyun@ntu.edu.cn。
參考文獻(xiàn)
［1］王曉謀.基礎(chǔ)工程［M］.北京：人民交通出版社，2010.
［2］湯武華,惲波,王靜民,等. 基于載荷試驗(yàn)的群樁沉降計(jì)算方法［J］.建筑結(jié)構(gòu)，2009,39(7),44-46.
［3］ENDO M，MINOU A，KAWASAKI T，et al. Negative skin friction acting on steel piles in clay ［C］// Proceedings 7th International Conference on Soil Mechanics and Foundation Engineering. Mexico, 1969:85-92.
［4］TERZAGHI K, PERK R B. 工程實(shí)用土力學(xué)［M］.蔣鵬年，譯.北京：水利水電出版社，1960.
［5］繆云.砂土群樁負(fù)摩擦力試驗(yàn)研究［D］.南京:東南大學(xué)，2012.
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