IDEAS home Printed from https://ideas.repec.org/a/eee/renene/v260y2026ics0960148126000418.html

Distributed fiber-optic in situ inversion method for ground thermal conductivity based on thermal perturbation of pile foundation engineering

Author

Listed:
  • Song, Xiaojin
  • Han, Heming
  • Zha, Fusheng
  • Wu, Shan
  • Kang, Bo
  • Xu, Long
  • Shun, Heng

Abstract

Soil thermal conductivity is a key thermophysical parameter in the synergistic development of urban subsurface space and geothermal energy. However, existing studies lack a mapping between thermal response temperature and soil parameters, and interference with the construction process. In this study, a distributed fiber-optic in situ inversion method for ground thermal conductivity is proposed based on the thermal perturbation generated during pile foundation engineering, which organically integrates construction with geothermal parameter testing. A distributed fiber optic sensing network is employed to monitor the heat diffusion process of hydration in grouted piles in real time. The mapping relationship between the distribution of ground thermal conductivity and the temperature gradient is derived using an analytical model of the temperature field under variable heat source conditions. The reliability of the heat conduction inverse inversion algorithm is verified through numerical simulations, and a field trial was conducted at an underground comprehensive project in Anhui. The results demonstrate that the diffusion boundary of the hydration heat of the piles is 2.4 m. The maximum deviation between the field-measured and laboratory-tested thermal conductivity values is only 0.029 W/(m·K). This study offers a cost-effective and innovative solution for the thermophysical investigation of underground spaces in smart cities.

Suggested Citation

  • Song, Xiaojin & Han, Heming & Zha, Fusheng & Wu, Shan & Kang, Bo & Xu, Long & Shun, Heng, 2026. "Distributed fiber-optic in situ inversion method for ground thermal conductivity based on thermal perturbation of pile foundation engineering," Renewable Energy, Elsevier, vol. 260(C).
    • Handle: RePEc:eee:renene:v:260:y:2026:i:c:s0960148126000418
    DOI: 10.1016/j.renene.2026.125216
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0960148126000418
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.renene.2026.125216?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to

    for a different version of it.

    More about this item

    Keywords

    ;
    ;
    ;
    ;
    ;

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:renene:v:260:y:2026:i:c:s0960148126000418. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/renewable-energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.