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The performance analysis of energy piles in cross-anisotropic soils

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  • Ai, Zhi Yong
  • Ye, Jia Ming
  • Zhao, Yong Zhi

Abstract

Energy piles possess two important properties – structural load-bearing and ground heat exchangers, which is a cost-effective building energy-saving solution. Besides, natural soils generally exhibit anisotropic properties which impact the overall performance of energy piles. Therefore, the performance of energy piles in layered cross-anisotropic soils is investigated in this paper. Firstly, based on the basic equations of elasticity and heat transfer theory, the extended precise integration method (EPIM) is applied to acquire the thermo-elastic fundamental solution of layered cross-anisotropic soils, which will be utilized as the kernel function of the boundary element method (BEM). Then, the stiffness matrix equation of the energy pile considering the thermal strain and mechanical loads is derived with the aid of the finite element method (FEM). Afterwards, according to soil-pile deformation coordination conditions, the coupled BEM-FEM formulation to represent the soil-pile interaction is developed. Compared with in-situ tests and numerical simulations, the accuracy of the proposed method is verified. Finally, parametric analyses are conducted on the performance of energy piles subjected to the mechanical and temperature load simultaneously, and influences of pile-soil stiffness ratio, length-diameter ratio and soil cross-anisotropy on energy pile responses are discussed.

Suggested Citation

  • Ai, Zhi Yong & Ye, Jia Ming & Zhao, Yong Zhi, 2022. "The performance analysis of energy piles in cross-anisotropic soils," Energy, Elsevier, vol. 255(C).
    • Handle: RePEc:eee:energy:v:255:y:2022:i:c:s0360544222014529
    DOI: 10.1016/j.energy.2022.124549
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    References listed on IDEAS

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    1. Sani, Abubakar Kawuwa & Singh, Rao Martand & Amis, Tony & Cavarretta, Ignazio, 2019. "A review on the performance of geothermal energy pile foundation, its design process and applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 106(C), pages 54-78.
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    3. 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.
    4. Li, Min & Lai, Alvin C.K., 2012. "New temperature response functions (G functions) for pile and borehole ground heat exchangers based on composite-medium line-source theory," Energy, Elsevier, vol. 38(1), pages 255-263.
    5. Rivera, Jaime A. & Blum, Philipp & Bayer, Peter, 2016. "Influence of spatially variable ground heat flux on closed-loop geothermal systems: Line source model with nonhomogeneous Cauchy-type top boundary conditions," Applied Energy, Elsevier, vol. 180(C), pages 572-585.
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    Cited by:

    1. Ai, Zhi Yong & Ye, Jia Ming, 2023. "Thermo-mechanical analysis of pipe energy piles in layered cross-isotropic soils," Energy, Elsevier, vol. 277(C).

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