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Thermo‒mechanical behavior of energy pile group in dry sand subjected to a horizontal load

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  • Ding, Xuanming
  • Wu, Qi
  • Wang, Chenglong
  • Kong, Gangqiang

Abstract

The energy pile is an innovative structure element designed to utilize geothermal energy while simultaneously supporting building loads by means of integrating heat exchange tubes into the pile foundation. Despite the intricate thermodynamic characteristics of energy pile groups, research on them remains limited. This study investigated the horizontal load transfer mechanism of an energy pile group in dry sand by conducting a model test on a 2 × 2 energy pile group subjected to horizontal loads. Specifically, the impact of heating or cooling a single pile within the energy pile group was examined. The results showed that the bending moment was significantly larger on a single pile subjected to a thermal load than that of the other piles, with the majority of this variation occurring in its upper part. Additionally, the horizontal load had a strong influence on the rotational angle and horizontal displacement of the energy pile group. The rotational angle and horizontal displacement decreased with increasing depth. With rising temperature, the interaction between the pile and the soil intensified, and the soil pressure on the upper part of the pile increased while that in the lower part decreased.

Suggested Citation

  • Ding, Xuanming & Wu, Qi & Wang, Chenglong & Kong, Gangqiang, 2024. "Thermo‒mechanical behavior of energy pile group in dry sand subjected to a horizontal load," Renewable Energy, Elsevier, vol. 233(C).
    • Handle: RePEc:eee:renene:v:233:y:2024:i:c:s0960148124012382
    DOI: 10.1016/j.renene.2024.121170
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    References listed on IDEAS

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    1. Heidari, Bahareh & Akbari Garakani, Amir & Mokhtari Jozani, Sahar & Hashemi Tari, Pooyan, 2022. "Energy piles under lateral loading: Analytical and numerical investigations," Renewable Energy, Elsevier, vol. 182(C), pages 172-191.
    2. Li, Min & Lai, Alvin C.K., 2015. "Review of analytical models for heat transfer by vertical ground heat exchangers (GHEs): A perspective of time and space scales," Applied Energy, Elsevier, vol. 151(C), pages 178-191.
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