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Thermal conduction characteristics of DTS when detecting the integrity of cast-in-place piles considering their environment

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Abstract

Based on the thermal integrity testing method of foundation pile, distributed optical fiber temperature sensing (DTS) technology was applied to testing the integrity of a cast-in-place pile. A theoretical model was established for the heat transfer and temperature characteristics in consideration of the physical properties of piles and the surrounding media. By establishing a model of a pile with and without covering soil, the thermal conduction of piles could be studied effectively. The results showed that, at the same heating power, the temperature rise of each layer optical fiber in the pile was basically the same when the ambient temperature around the pile did not change by more than 7.0 °C and the soil temperature around the pile did not change by more than 3.1 °C. At the same soil temperature, the temperature rise of each layer optical fiber in the pile increased with an increase in heating power. Further, we studied the heat conduction characteristics of the pile after the soil was compacted. The results showed that the experimental temperature rise in layers F1–F6 was basically consistent with that of the theoretical temperature rise. After the soil around the model pile was compacted, the thermal conductivity of soil was increased, the further contact between the pile and soil interface was enhanced, which accelerated the thermal diffusion of the pile.

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Abbreviations

C :

integral constant

d :

differential

k p :

thermal conductivity of pile (Wm−1K−1)

k s :

thermal conductivity of soil (Wm−1K−1)

L :

heating length (m)

q :

heating power (Wm−1)

R :

resistance (Ω)

r :

radius (cm)

r 0 :

influence radius of heat conduction (cm)

r 1 :

the inner diameter of metal armored protective layer (cm)

r 3 :

the vertical distance from the pile surface to the heated optical fiber axis (cm)

r 4 :

the vertical distance from the soil surface to the axis of the heated optical fiber (cm)

T :

temperature (°C)

T(r):

temperature distribution

T 0 :

initial temperature (°C)

T 1 :

the temperature at the point with distance r1 away from the center of the heat source (°C)

T 3 :

the temperature at the point with distance r3 away from the center of the heat source (°C)

T s :

average soil temperature (°C)

t:

heating time (s)

U :

heating voltage (v)

o :

dimensionless quantities

* :

dimensionless quantities

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Acknowledgements

The authors thank the financial support from the National Natural Science Foundation of China (NSFC) under grant Nos. 51578219, 51608181and 51678223. The authors also thank the financial support from Hubei Science and Technology Department Major Projects of China under grant Nos. 2018ACA134.

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Authors and Affiliations

  1. Hubei Provincial Ecological Road Engineering Technology Research Center, Hubei University of Technology, Wuhan, 430068, China

    Yongli Liu, Hao Ding, Kebing Wang, Henglin Xiao & Lihua Li

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  1. Yongli Liu
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  2. Hao Ding
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Correspondence to Henglin Xiao.

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Liu, Y., Ding, H., Wang, K. et al. Thermal conduction characteristics of DTS when detecting the integrity of cast-in-place piles considering their environment. Heat Mass Transfer 56, 2185–2202 (2020). https://doi.org/10.1007/s00231-020-02848-3

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  • DOI: https://doi.org/10.1007/s00231-020-02848-3

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