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Thermo-mechanical analysis of pipe energy piles in layered cross-isotropic soils

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  • Ai, Zhi Yong
  • Ye, Jia Ming

Abstract

This paper aims to propose a method for the thermo-mechanical analysis of pipe energy piles in layered cross-anisotropic soils. Firstly, the pipe pile is modelled as a bar and the stiffness matrix equation considering thermo-mechanical loads is established based on the finite element method (FEM). The soils are considered to be layered cross-anisotropic and the boundary element method (BEM) is employed to obtain the deformation-force relationship of the soil-pile nodes. Afterwards, the coupled BEM-FEM equation is developed according to soil-pile deformation coordination conditions. The proposed method is verified with responses of pipe piles, solid energy piles and pipe energy piles. Parametric analyses show that the performance of the pipe energy pile induced by heating needs considering in the design of the pipe pile thickness, and the induced tensile stress should be taken into account in the design in hard soils. Besides, the influence of cross-anisotropy on the performance of the pile under cooling is larger than that under heating, and a softer surface soil layer yields a smaller axial force of the pipe energy pile for layered soils.

Suggested Citation

  • Ai, Zhi Yong & Ye, Jia Ming, 2023. "Thermo-mechanical analysis of pipe energy piles in layered cross-isotropic soils," Energy, Elsevier, vol. 277(C).
    • Handle: RePEc:eee:energy:v:277:y:2023:i:c:s0360544223011519
    DOI: 10.1016/j.energy.2023.127757
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    References listed on IDEAS

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    1. Go, Gyu-Hyun & Lee, Seung-Rae & Yoon, Seok & Kang, Han-byul, 2014. "Design of spiral coil PHC energy pile considering effective borehole thermal resistance and groundwater advection effects," Applied Energy, Elsevier, vol. 125(C), pages 165-178.
    2. 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).
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    Cited by:

    1. Ai, Zhi Yong & Feng, Wei Yong, 2024. "The mechanical response of energy pile groups in layered cross-anisotropic soils under vertical loadings," Energy, Elsevier, vol. 292(C).

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