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Volume 46 Issue 5
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LIU Hongwei, WANG Mengqi, ZHAN Liangtong, FENG Song, WU Tao. Method and apparatus for measuring in-situ gas diffusion coefficient and permeability coefficient of unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(5): 948-958. DOI: 10.11779/CJGE20221228
Citation: LIU Hongwei, WANG Mengqi, ZHAN Liangtong, FENG Song, WU Tao. Method and apparatus for measuring in-situ gas diffusion coefficient and permeability coefficient of unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(5): 948-958. DOI: 10.11779/CJGE20221228
shu

Method and apparatus for measuring in-situ gas diffusion coefficient and permeability coefficient of unsaturated soils

  • 1.

    Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China

  • 2.

    Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

  • 3.

    Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education, Zhejiang University, Hangzhou 310058, China

  • 4.

    College of Civil Engineering, Fuzhou University, Fuzhou 350108, China

  • 5.

    College of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212000, China

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  • Received Date: October 06, 2022
  • Available Online: May 14, 2024
    Graphical Abstract
    • Abstract
  • The gas diffusion (Dg) and permeability (Kg) coefficients are the two important parameters for the study on gas transport in unsaturated soils. In the present study, the theory of calculating Dg and Kg for unsaturated soils under steady state is derived. Dg and Kg of unsaturated soils are determined based on the relationship between tracer gas concentration (C) and gas flow rate (q1) and that between pressure gradient (p) and gas flow rate (q2), respectively. A device for in-situ measurement of Dg and Kg in unsaturated soils is designed and developed. The soil column tests are conducted to measure Dg and Kg of unsaturated soils with different water contents. Thereafter, the element tests and numerical simulation analysis are used to verify the effectiveness of the new method and device. It is found that Dg and Kg obtained by the new method are in good agreement with the results of the element tests and numerical simulations. The results of the sensitivity analysis show that the measurement accuracy of Dg reduces as the soil water content decreases, while the measurement accuracy of Kg is independent of water content of soil. The measurement accuracies of both Dg and Kg decrease with the increase of the radius of the aeration bulb, but the measurement of Kg is more sensitive to the change of the radius. The measurement accuracy of Kg is about 55% of the true value, when the radius of the aeration bulb is 0.05 m. The soil anisotropy reduces the measurement accuracy; when the values of Dgv/Dgh and Kgv/Kgh is 0.1, the measurement accuracies of Dg and Kg can still reach more than 40%.
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