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Advanced physical modeling of energy micropile for shallow geothermal in underpinning projects
Energy and Buildings ( IF 6.6 ) Pub Date : 2025-01-16 , DOI: 10.1016/j.enbuild.2025.115294
Kaveh Roushan, Asskar Janalizadeh Choobbasti

Energy micropiles (EMPs) combine foundation systems with shallow geothermal energy technology, offering the advantages of structural reinforcement alongside enhanced energy efficiency. This research examines the thermo-mechanical behavior of energy micropiles (EMPs) in relation to shallow geothermal systems and retrofitting applications, employing laboratory-scale physical modeling in a controlled environment. Experiments were carried out utilizing a custom-designed sand pluviation system to guarantee uniform soil density in Babolsar sand. EMPs, which include U-shaped copper heat transfer tubes filled with either water or cement grout as the heat transfer medium, were exposed to different thermal loading durations of 6, 12, and 24 h alongside mechanical loads. Essential data were meticulously recorded and analyzed, encompassing micropile head displacement, axial strain, and temperature distribution within the micropile and surrounding soil. The findings indicate that heat dissipation primarily occurs radially, with temperature gradients showing a marked increase at greater distances from the micropile as the duration of heating extends. Mechanical loads mitigated thermal expansion, reducing micropile head displacement by approximately 20%. Compared to water, the higher thermal conductivity of cement grout amplified thermal strains and stresses along the micropile. Thermal stress profiles indicated pronounced strain at the micropile’s upper and lower sections, with the neutral axis shifting under mechanical constraints. Furthermore, heat transfer efficiency and mobilized side shear stress were significantly enhanced when cement grout was used, highlighting its superior thermal conductivity. This study advances the understanding of EMP behavior by addressing thermal and mechanical interactions, fluid properties, and heat dissipation patterns. The insights obtained enhance the design and implementation of EMPs for sustainable infrastructure, especially in energy-efficient retrofitting and new building initiatives. These findings highlight the potential of EMPs to improve the integration of structural reinforcing and renewable energy technologies in geotechnical engineering.

中文翻译:


托换项目中浅层地热能源微桩的高级物理建模



能源微型桩 (EMP) 将基础系统与浅层地热能技术相结合,在提高能源效率的同时提供结构加固的优势。本研究在受控环境中采用实验室规模的物理建模,检查了能源微桩 (EMP) 与浅层地热系统和改造应用相关的热机械行为。利用定制设计的沙子灌注系统进行实验,以保证 Babolsar 沙子中土壤密度的均匀性。EMP 包括填充有水或水泥灌浆作为传热介质的 U 形铜传热管,与机械载荷一起暴露于 6 、 12 和 24 小时的不同热载荷持续时间。详细记录和分析了基本数据,包括微桩头位移、轴向应变以及微桩和周围土壤内的温度分布。研究结果表明,散热主要发生在径向上,随着加热持续时间的延长,温度梯度在距离微桩较远的地方明显增加。机械载荷减轻了热膨胀,将微桩头位移减少了约 20%。与水相比,水泥浆料的较高导热性放大了微桩沿线的热应变和应力。热应力剖面表明微桩的上部和下部有明显的应变,中性轴在机械约束下移动。此外,使用水泥浆液时,传热效率和移动侧剪应力显著提高,凸显了其卓越的导热性。 本研究通过解决热和机械相互作用、流体特性和散热模式,促进了对 EMP 行为的理解。获得的见解增强了可持续基础设施的 EMP 的设计和实施,尤其是在节能改造和新建筑计划中。这些发现强调了 EMP 在改善结构加固和可再生能源技术在岩土工程中的整合方面的潜力。
更新日期:2025-01-16
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