Thermal-mechanical behavior of deeply buried pipe energy pile group in sand obtained from model test

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS Applied Thermal Engineering Pub Date : 2024-11-28 DOI:10.1016/j.applthermaleng.2024.125078
Jianghuai Yuan , Zhi Chen , Henglin Xiao , Lifei Zheng , Wentao Li , Xugen Song
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Abstract

One practical and effective method for shallow geothermal development is energy piling. This research presents the deeply buried pipe energy pile (DBP-EP), which has a wide range of potential applications and can collect deeper geothermal heat from the pile toe. This work conducts a model test investigation of the thermal–mechanical behavior of the DBP-EP group in sandy soil because the construction of the former differs from that of the common inside buried pipe energy piles (IBP-EP). The findings indicate that the heat exchanger tube at the pile toe of DBP-EP will be extended outward for heat exchange with the soil, in contrast to IBP-EP, and that the temperature change at the pile toe is greater than that of the whole. The pile cross-section strain decreases gradually from inside to outside along the radial direction. The axial earth pressure change rule around the pile is larger at both ends and small in the middle. For every 1℃ that the inlet temperature raises, the pile top’s final displacement increases by roughly 0.11‰D. At various inlet temperatures, the DBP-EP group heat transfer rate per meter drops by 8% − 23% when compared to the single pile’s. The average axial earth pressure difference surrounding the pile gradually rises when the pile top is not loaded, while the pile side friction difference of the pile group reduces in comparison to that of the single pile. The variations in pile side friction, axial earth pressure surrounding the pile, and pile top displacement of the pile group are reduced when the pile top is loaded because of the dense effect between the pile and the soil. This study contributes to the theoretical understanding of the design and practical implementation of DBP-EP structures.
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砂中深埋管桩群的热-力学特性模型试验
能源桩是一种实用有效的浅层地热开发方法。深埋管道能源桩(DBP-EP)具有广泛的应用潜力,可以从桩趾处收集深层地热。由于DBP-EP与普通埋管式能源桩(IBP-EP)的施工方式不同,本文对DBP-EP组在砂土中的热力学行为进行了模型试验研究。结果表明,与IBP-EP相比,DBP-EP的桩端换热管会向外延伸,与土壤进行换热,且桩端温度变化大于整体。桩截面应变沿径向由内向外逐渐减小。桩周轴向土压力变化规律为两端较大,中间较小。入口温度每升高1℃,桩顶最终位移增加约0.11‰D。在不同的进口温度下,与单桩相比,DBP-EP组每米换热率下降了8% - 23%。桩顶无荷载时,桩周平均轴向土压力差逐渐增大,群桩侧摩阻力差相对于单桩减小。桩顶加载时,由于桩土之间的致密效应,降低了桩侧摩阻力、桩周轴向土压力和群桩顶位移的变化。本研究有助于对DBP-EP结构的设计和实际实现的理论认识。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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