饱和黏土中热交换桩承载力特性模型试验研究

doi:10.13722/j.cnki.jrme.2017.0370

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摘要在28 ℃，28 ℃→55 ℃，28 ℃→55 ℃→28 ℃三种工况下，开展宁波饱和黏土中热交换桩承载力特性模型试验研究，先对桩土加热(降温)，再进行静载荷试验，测定土体的温度和孔隙水压力、地表沉降及桩顶位移、桩身轴力和荷载–沉降试验数据，研究土体的热固结过程及桩负摩阻力的形成机制；其次，以模型试验为原型，利用Abaqus软件建立了考虑热流固耦合作用的桩–土有限元模型，将计算结果与试验结果进行对比验证，进而讨论温度对桩身轴力和桩侧摩阻力的影响，结果表明：加热升温后，桩、土发生膨胀变形，土中出现超静孔隙水压力；随着孔压的消散，土体发生热固结现象，且其固结沉降量大于桩体沉降量，地基最终表现为沉降变形，而桩侧出现下拉荷载，产生负摩阻力；随温度的升高，沿深度方向，桩身轴力衰减，热固结后土体的强度有所提高，桩侧摩阻力增大，单桩极限承载力随温度的升高而增大。

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关键词 ：桩基础, 饱和黏土, 热交换桩, 模型试验, 承载力

Abstract：The experimental study on the bearing capacity of heat-exchange piles in saturated clay in Ningbo was carried out under the conditions of 28 ℃，28 ℃→55 ℃，28 ℃→55 ℃→28 ℃. Heating (cooling) was carried out on the pile and soil firstly，and the static load test was then carried out to measure the temperature and pore water pressure，surface subsidence and displacement at pile top，axial force of pile and load-settlement data. The process of thermal consolidation and the mechanism of negative friction are investigated. Secondly，based on the model test，the finite element model for pile-soil considering the thermo-hydrodynamic coupling effect is established using software Abaqus. The calculated results are compared with the experimental results. The influence of temperature on the axial force and pile side friction of pile is discussed. The results show that the expansive deformation occurs in the pile and soil after heating，and the excess pore water pressure appears in the soil. With the dissipation of the pore pressure，the phenomenon of consolidation upon heating occurs in the soil，the settlement of soil is larger than that of the pile，the soil settlement takes place，and the negative skin friction resistance occurs because of the dragging load at the side of pile. With the increase of temperature，the strength of the pile is weakened along the depth direction，the strength of the soil after the heating consolidation is increased，the friction resistance of the pile is increased and the ultimate bearing capacity of the single pile increases with the temperature.

Key words： pile foundations saturated clay heat exchanger piles model test bearing capacity

引用本文:

刘干斌，谢琦峰，范高飞，钱峰，齐昌广. 饱和黏土中热交换桩承载力特性模型试验研究[J]. 岩石力学与工程学报, 2017, 36(10): 2535-2543.
(宁波大学岩土工程研究所，浙江宁波 315211). Model test on bearing capacity characteristics of heat exchanger piles in saturated clays. , 2017, 36(10): 2535-2543.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0370 或 http://www.rockmech.org/CN/Y2017/V36/I10/2535

[1]	BRANDL H. Energy foundations and other thermo-active ground structures[J]. Geotechnique，2006，56(2)：81-122. " target="_blank">
[3]	MORINO K，OKA T. Study on heat exchanged in soil by circulating water in a steel pile[J]. Energy and Buildings，1994，21(1)：65-78. " target="_blank">
[7]	ZHANG W，YANG H，LU L，et al. The research on ring-coil heat transfer models of pile foundationground heat exchangers in the case of groundwater seepage[J]. Energy and Buildings，2014，71(2)：115-128. " target="_blank">
[14]	AMATYA B L，SOGA K，BOURNE-WEBB P J. Thermo- mechanical behaviour of energy piles[J]. Géotechnique，2012，62(6)：503-519. " target="_blank">
[15]	刘汉龙，孔纲强，吴宏伟，等. 能量桩工程应用研究进展及PCC能量桩技术开发[J]. 岩土工程学报，2014，36(1)：176-181.(LIU Hanlong，KONG Gangqiang，WU Hongwei，et al. Review of the applications of energy pile and development of PCC energy pile technical[J]. Chinese Journal of Geotechnical Engineering，2014，36(1)：176-181.(in Chinese))
[2]	MOEL M D，BACH P M，BOUAZZA A，et al. Technological advances and applications of geothermal energy pile foundations and their feasibility in australia[J]. Renewable and Sustainable Energy Reviews，2010，14(9)：2 683-2 696. " target="_blank">
[13]	KNELLWOLF C，PERON H，LALOUI L. Geotechnical analysis of heat exchanger piles[J]. Journal of Geotechnical and Geoenvironmental Engineering，2011，137(10)：890-902.
[16]	黄旭，孔纲强，刘汉龙，等. 循环温度场作用下PCC能量桩热力学特性模型试验研究[J]. 岩土力学，2015，36(3)：667-673.(HUANG Xu，KONG Gangqiang，LIU Hanlong，et al. Experimental research on thermo- mechanical characteristics of PCC energy pile under cyclic temperature field[J]. Rock and Soil Mechanics，2015，36(3)：667-673.(in Chinese))
[17]	路宏伟，蒋刚，王昊，等. 摩擦型能源桩荷载-温度现场联合测试与承载性状分析[J]. 岩土工程学报，2017，39(2)：334-342.(LU Hongwei，JIANGGang，WANG Hao，et al. In situ tests and analysis of mechanical-thermo bearing characteristic of drilled friction geothermal energy pile[J]. Chinese Journal of Geotechnical Engineering，2017，39(2)：334-342.(in Chinese))
[8]	ZARRELLA A，DE CARLI M，GALGARO A. Thermal performance of two types of energy foundation pile：Helical pipe and triple U-tube[J]. Applied Thermal Engineering，2013，61(2)：301-310.
[6]	陈忠购，赵石娆，张正威. 内置并联U形埋管能量桩的换热性能研究[J]. 工程力学，2013，30(5)：238-243.(CHEN Zhonggou，ZHAO Shirao，ZHANG Zhengwei. Heat transfer analysis of energy piles with parallel connected U-tubes[J]. Engineering Mechanics，2013，30(5)：238-243.(in Chinese))
[9]	LOVERIDGE F，POWRIE W. 2D thermal resistance of pile heat exchangers[J]. Geothermics，2014，50(3)：122-135. " target="_blank">
[10]	LALOUI L，NUTH M，VULLIET L. Experimental and numerical investigations of the behavior of a heat exchanger pile[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2006，30(8)：763-781. " target="_blank">
[12]	ROSENBERG J E. Centrifuge modeling of soil structure interaction in thermo-active foundations[M. S. Thesis][D]. Colorado：University of Colorado at Boulder，2010. " target="_blank">
[18]	中华人民共和国行业标准编写组. JGJ 106—2014 建筑基桩检测技术规范[S]. 北京：中国建筑工业出版社，2014.(The Professional Standards Compilation Group of People?s Republic of China. JGJ 106—2014 Technical code for testing of building foundation piles[S]. Beijing：China Architecture and Building Press，2014.(in Chinese)) " target="_blank">
[19]	祁良，郑荣跃，陶海冰，等. 考虑温度影响的宁波软土临界状态参数研究[J]. 水文地质工程地质，2015，42(5)：79-83.(QI Liang，ZHENG Rongyue，TAO Haibing，et al. A study of the critical state parameter of the Ningbo soft clay considering the effect of temperature[J]. Hydrogeology and Engineering Geology，2015，42(5)：79-83.(in Chinese))
[4]	MAN Y，YANG H X，DIAO N R，et al. Development of spiral heat source model for novel pile ground heat exchangers[J]. HVAC and R Research，2011，17(6)：1 075-1 088. " target="_blank">
[5]	LI M，LAI A. New temperature response functions(G functions) for pile and borehole ground heat exchangers based on composite-medium line-source theory[J]. Energy，2012，38(1)：255-263.
[11]	BOURNE-WEBB P J，AMATYA B，SOGA K，et al. Geotechnical and thermodynamic aspects of pile response to heat cycles[J]. Geotechnique，2009，59(3)：237-248. " target="_blank">