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Volume 43 Issue 2
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LIU Jie, SUN Meng-ya, SHI Bin, WEI Guang-qing, GUO Jun-yi, ZHENG Xing. Feasibility study on actively heated FBG methods for dry density measurement[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(2): 390-396. DOI: 10.11779/CJGE202102020
Citation: LIU Jie, SUN Meng-ya, SHI Bin, WEI Guang-qing, GUO Jun-yi, ZHENG Xing. Feasibility study on actively heated FBG methods for dry density measurement[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(2): 390-396. DOI: 10.11779/CJGE202102020
shu

Feasibility study on actively heated FBG methods for dry density measurement

  • 1.

    School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

  • 2.

    NanZee Sensing Technology, Ltd., Suzhou 215123, China

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  • Received Date: April 12, 2020
  • Available Online: December 04, 2022
    Graphical Abstract
    • Abstract
  • An in-situ method based on the actively heated fiber Bragg grating for monitoring dry density is proposed (abbreviated to H-FBG) to make a progress in the existing technique. The relationship between the temperature characteristic value (Tt) and the dry density (ρd) is established through the thermal conductivity for the in-situ monitoring of the dry density. A series of indoor tests are carried to verify the feasibility of the method, the effects of moisture content and types of soils are discussed, and the heating parameters are determined. The results show that Tt decreases with the increasing ρd, and it is described well using the exponential function. 15 W/m and 5 min can be the best heating parameters applied for the measurement. The temperature of the soils with a higher water content decreases slowly owing to the effects of micro-structure of soils. The results may provide the theoretical and technical foundation for the further application of the proposed method.
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    • References (14)
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