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• W4380488399 abstract "Thermal conductivity of rock is one of the important parameters to understand the heat conduction process in interior of the earth. The study of the effect on the thermal conductivity of clay-bearing sandstone subjected to drying–wetting process is of great significance to many geological and geotechnical engineering issues. In this study, drying–wetting cycle experiments on clay-bearing sandstone were carried out, including three times of drying and two times of water saturation treatment. The thermal conductivity of clay-bearing sandstone after each treatment was measured by transient hot wire method, and the thermal inhomogeneity was analyzed. The results indicate that the drying–wetting process leads to the decrease of the average thermal conductivity of clay-bearing sandstone, while the increase of thermal heterogeneity factor. Base on the results of 3D scanning and SEM, it is found that the development of pores and microcracks during the drying–wetting process is the main reason for the average thermal conductivity decreased and the thermal inhomogeneity increased. Further analysis shows that the interaction between clay minerals and water leads to the destruction of rock matrix structure, resulting in the increase of primary pores, the formation of new pores and secondary microcracks in clay-bearing sandstone. In addition, the numerical results show that the pore leads to the significant weakening of rock heat transfer effect, and the temperature field tends to be heterogeneous distribution. The research results can provide reference for the evaluation of thermal conductivity of rock mass in deep engineering." @default.
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• W4380488399 date "2023-06-13" @default.
• W4380488399 modified "2023-10-05" @default.
• W4380488399 title "Effect on the thermal conductivity inhomogeneity of clay-bearing sandstone subjected to drying–wetting process" @default.
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• W4380488399 doi "https://doi.org/10.1007/s12665-023-11010-1" @default.
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