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The mechanical response of energy pile groups in layered cross-anisotropic soils under vertical loadings

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  • Ai, Zhi Yong
  • Feng, Wei Yong

Abstract

The mechanical response of energy pile groups in layered cross-anisotropic soils under vertical loadings is studied with the aid of the coupled finite element method - boundary element method (FEM-BEM). The single energy pile is simulated based on the finite element theory, which then is extended to energy pile groups. The global flexibility matrix for soils is obtained by considering the coupling effects of vertical and thermal loadings. The coupled FEM-BEM equation for the interaction between energy pile groups and soils is derived based on the displacement compatibility condition at the pile-soil interface. According to the displacement coordination condition and force balance in the rigid cap, the displacement of the cap and axial forces of pile groups can be solved. The presented theory is validated by comparing the calculated results with numerical simulations and field test results in existing literature. Finally, effects of the thermal loading, pile-soil stiffness ratio, pile spacing, cross-anisotropy of Young's modulus and the stratification are discussed.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:292:y:2024:i:c:s0360544224003025
    DOI: 10.1016/j.energy.2024.130531
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    References listed on IDEAS

    as
    1. 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).
    2. Ai, Zhi Yong & Ye, Jia Ming, 2023. "Thermo-mechanical analysis of pipe energy piles in layered cross-isotropic soils," Energy, Elsevier, vol. 277(C).
    3. Fadejev, Jevgeni & Simson, Raimo & Kurnitski, Jarek & Haghighat, Fariborz, 2017. "A review on energy piles design, sizing and modelling," Energy, Elsevier, vol. 122(C), pages 390-407.
    4. Georgiadis, Konstantinos & Skordas, Dimitrios & Kamas, Ioannis & Comodromos, Emilios, 2020. "Heating and cooling induced stresses and displacements in heat exchanger piles in sand," Renewable Energy, Elsevier, vol. 147(P2), pages 2599-2617.
    5. Ng, C.W.W. & Farivar, A. & Gomaa, S.M.M.H. & Shakeel, M. & Jafarzadeh, F., 2021. "Performance of elevated energy pile groups with different pile spacing in clay subjected to cyclic non-symmetrical thermal loading," Renewable Energy, Elsevier, vol. 172(C), pages 998-1012.
    6. Lichen Li & Longlong Dong & Chunhua Lu & Wenbing Wu & Minjie Wen & Rongzhu Liang, 2021. "Analysis of Bearing Characteristics of Energy Pile Group Based on Exponential Model," Energies, MDPI, vol. 14(21), pages 1-16, October.
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