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Heterogeneous Frost Deformation of Partially Saturated Sandstones Due to the Freeze–Thaw Cycle

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Abstract

Understanding the frost deformation characteristics of rock with varying water contents under freeze–thaw conditions is of great significance to engineering construction activity in cold regions. In this study, sandstone samples with different degrees of water saturation were first prepared and then submitted to cyclic freeze–thaw experiments. Temperature sensors and strain gauges were attached to the samples so as to trace the temperature and strain changes. The changes in the major principal strain and minor principal strain against the temperature were individually explored. It is found that the sandstones exhibit heterogeneous frost deformation behaviors during the freeze–thaw cycle, and the heterogeneity of frost deformation is more considerable in terms of the sandstone with a higher degree of saturation based on the strain ellipse analysis. The coefficient of linear thermal expansion (CLTE), maximum frost heave strain and residual frost heave strain tend to increase exponentially with increasing the degree of saturation. These three parameters, however, are different from one another along the minor and major principal strain directions, which further gives evidence of the heterogeneous frost-heaving features of the sandstone. Finally, the crystallization pressures within a single pore and over the entire sandstone volume were theoretically calculated. It is verified that the resulting stress translated by the crystallization pressure for the 80% or higher saturation degree exceeds the tensile failure threshold, which explains the mechanisms that more considerable frost-heaving damage and heterogeneous behaviors are caused in the sandstone with a saturation degree of 80% or higher. The findings in this study help schedule feasible ways of alleviating the freeze–thaw-induced damage of rock mass in cold regions.

Highlights

  • Integrated strain and temperature measurements of the partially saturated sandstones during the freeze–thaw cycle.

  • Heterogeneous frost deformation was found in the partially saturated sandstones.

  • More considerable heterogeneous frost deformation was generated in the sandstone with a higher degree of saturation.

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Data Availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (52004182, 52278412 and 42077246), Innovation Group Project of Hubei Provincial Natural Science Foundation (2023AFA003) and Fundamental Research Funds for the Central Universities (2042022kf1055 and 2042023kfyq03).

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Correspondence to Xiangyu Xu.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Weng, L., Zhang, H., Wu, Z. et al. Heterogeneous Frost Deformation of Partially Saturated Sandstones Due to the Freeze–Thaw Cycle. Rock Mech Rock Eng 57, 61–77 (2024). https://doi.org/10.1007/s00603-023-03542-6

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  • DOI: https://doi.org/10.1007/s00603-023-03542-6

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