（宁波大学岩土工程研究所， 宁波 315211）

［摘要］为了揭示温度对桩体沉降的影响，建立了考虑温度效应的荷载传递模型。对宁波典型淤泥质软黏土开展了不同温度下的三轴固结不排水试验。通过数据处理和对强度包线进行分析，得到了黏聚力、内摩擦角与温度的函数关系。并基于耦合温度的荷载传递模型，开展了算例分析。结果表明：温度主要通过影响土体的黏聚力和内摩擦角从而影响桩基沉降特性；随着温度的升高，土体的黏聚力、内摩擦角有所下降，桩顶和桩端均会发生微量的附加沉降。最后对某实际工程的试桩进行分析，结果表明该桩沉降主要由荷载效应产生，而温度对其影响不明显，且温度对该桩桩端的影响要大于桩顶。

［关键词］温度效应； 桩体沉降； 三轴试验； 荷载传递

中图分类号：TU411-5文献标识码：A文章编号：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

*浙江省自然科学基金项目(LY17E080008)，宁波市自然科学基金项目(2017A610310)。

通讯作者：邓岳保，博士，副教授，Email：dengyuebao@nbu.com.cn。