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Characterization of macropore structure of remolded loess and analysis of hydraulic conductivity anisotropy using X-ray computed tomography technology

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Abstract

The pore structure of loess is crucial for understanding the transport of water in soil and affects soil permeability. In this study, X-ray computed tomography (X-ray CT) technology was used to establish the macropore structure of remolded loess, and analyze the influence of macropore on permeability. A new specific and efficient workflow for constructing macropore structure of loess samples was established. The workflow improves the precision of image segmentation and provides a new method for creating 3D soil macropore structure. The macropore structure showed that the macro-porosity variation of loess sample was clearly anisotropic. Based on the macropore structure model, a modified Kozeny–Carman equation was suggested to investigate the hydraulic conductivity anisotropy of the loess sample. Subsequently, permeability test was used to verify the results calculated by equation. Both the results showed that hydraulic conductivity was positively correlated with the uniformity of the porosity changes in each direction. It provides a new method to estimate the anisotropy of hydraulic conductivity based on macropore structure model.

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Acknowledgements

This study was financially supported by the National Natural Science Foundation of China (Grant Nos. 41931285, 41572236, 41790441) and the Fundamental Research Funds for the central University [CHD (300102290718), CHD (300102298712)]. The completion of this article was inseparable from the contributions of all the authors. Their support is gratefully acknowledged.

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Authors and Affiliations

  1. School of Environmental Science and Engineering, Chang’an University, Xi’an, 710054, Shaanxi, China

    Haike Wang, Hui Qian & Yanyan Gao

  2. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang’an University, Xi’an, 710054, Shaanxi, China

    Haike Wang, Hui Qian & Yanyan Gao

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  1. Haike Wang
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  2. Hui Qian
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Correspondence to Hui Qian.

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Wang, H., Qian, H. & Gao, Y. Characterization of macropore structure of remolded loess and analysis of hydraulic conductivity anisotropy using X-ray computed tomography technology. Environ Earth Sci 80, 197 (2021). https://doi.org/10.1007/s12665-021-09405-z

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