热-力耦合作用下新型能量桩承载性能试验研究
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吉林建筑大学

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TU473

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吉林省教育厅科学技术项目(JJKH20220282KJ),吉林省科技发展计划项目(2019030322SF),国家自然科学基金项目(42002263)


Experimental Study on Bearing Capacity of New Energy Pile under Thermal-mechanical Coupling
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Jilin Jianzhu University

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    摘要:

    摘 要 能量桩在承担上部建筑荷载的同时兼起到地源热泵换热器的作用,热-力耦合作用下对其承载性能产生的影响与常规桩不同。文章基于室内模型试验方法,对热-力耦合作用下饱和砂土地基中新型能量桩(掺入0.6 %的钢纤维和4 %的石墨)桩周温度场分布、桩身热应力、桩端土压力、桩身侧摩阻力、桩顶以及桩周土体竖向位移的变化规律进行研究。试验结果表明:桩端土压力在升温时逐渐增大,降温时逐渐减小;桩身热应力随着深度的增加呈现先增加后减小的趋势,同一深度处温度越高桩体内产生的热应力越大;无论有无工作荷载,桩侧摩阻力均随温度的升高而增大;工作荷载作用时,随着循环次数的增加桩顶的沉降位移不断累积,对结构的安全性、耐久性及正常使用造成不利的影响。

    Abstract:

    [Abstract] Energy pile not only bears the upper building load, but also plays the role of ground source heat pump heat exchanger. The influence of thermal-mechanical coupling on its bearing performance is different from that of conventional piles. Based on indoor model test method,a new type of energy pile in saturated sand foundation (with 0.6 % steel fiber and 4 % graphite) in thermal-mechanical couplingis used to measure the temperature distribution around the pile、the thermal stress of pile body、the earth pressure at pile end、the shaft friction of pile body、the vertical displacement of pile top and soil around pile. The results showed that the earth pressure at pile tip increases gradually at heating up and decreases gradually at cooling down;The thermal stress of the pile increases first and then decreases with the increase of the depth,the higher the temperature is at the same depth, the greater the thermal stress will be generated in the pile;With or without working load, the shaft friction of pile increases with the increase of temperature;Under working load, the settlement displacement of pile top accumulates with the increase of the number of cycles, which has a negative impact on the safety, durability and normal use of the structure.

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常虹,沈凤全,王琰,等. 热-力耦合作用下新型能量桩承载性能试验研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-12-17
  • 最后修改日期:2022-05-01
  • 录用日期:2022-05-05
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