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（寧波大學(xué)巖土工程研究所， 寧波 315211）

［摘要］為了揭示溫度對(duì)樁體沉降的影響，建立了考慮溫度效應(yīng)的荷載傳遞模型。對(duì)寧波典型淤泥質(zhì)軟黏土開展了不同溫度下的三軸固結(jié)不排水試驗(yàn)。通過數(shù)據(jù)處理和對(duì)強(qiáng)度包線進(jìn)行分析，得到了黏聚力、內(nèi)摩擦角與溫度的函數(shù)關(guān)系。并基于耦合溫度的荷載傳遞模型，開展了算例分析。結(jié)果表明：溫度主要通過影響土體的黏聚力和內(nèi)摩擦角從而影響樁基沉降特性；隨著溫度的升高，土體的黏聚力、內(nèi)摩擦角有所下降，樁頂和樁端均會(huì)發(fā)生微量的附加沉降。最后對(duì)某實(shí)際工程的試樁進(jìn)行分析，結(jié)果表明該樁沉降主要由荷載效應(yīng)產(chǎn)生，而溫度對(duì)其影響不明顯，且溫度對(duì)該樁樁端的影響要大于樁頂。

［關(guān)鍵詞］溫度效應(yīng)； 樁體沉降； 三軸試驗(yàn)； 荷載傳遞

中圖分類號(hào)：TU411-5文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)21-0119-05

Study on settlement characteristics of energy piles considering temperature effect

Tong Senjie, Deng Yuebao, Chen Fei, Liu Ganbin, Bao Xuming

(Institute of Geotechnical Engineering, Ningbo University, Ningbo 315211, China)

Abstract:In order to study the influence of temperature on settlement characteristics of piles, a new load transfer model considering temperature effect was proposed. A triaxial consolidated undrained test was carried out on typical silty soft soil in Ningbo. The functional relations between cohesive force, internal friction angle and temperature were obtained by analysing data and strength envelope. An example analysis was carried out based on the load transfer model of coupled temperature. The results show that the temperature mainly affects the settlement of pile foundation by affecting the cohesion force and the internal friction angle. With the increase of temperature, the cohesion force and the  internal friction angle of the soil decrease, and there will be a small amount of additional settlement at the pile tip and pile top. Finally, the analysis of a practical pile test shows that the settlement of the pile is mainly caused by the load effect, and the influence of temperature on the pile tip is not obvious. And the influence of temperature on the pile tip is greater than that on the pile top.

Keywords:temperature effect; pile foundation settlement; triaxial test; load transfer

*浙江省自然科學(xué)基金項(xiàng)目(LY17E080008)，寧波市自然科學(xué)基金項(xiàng)目(2017A610310)。

通訊作者：鄧岳保，博士，副教授，Email：dengyuebao@nbu.com.cn。