Abstract
To verify whether fractal characteristics are measured by infrared radiation (IR) experiments, IR and AE monitoring of sandstone samples under uniaxial compression was carried out. The relationship between the infrared radiation count correlation dimension (DIR) based on the G-P algorithm and fractal theory was established by these tests. The fractal characteristics and precursors of IR during sandstone fracture were obtained by comparing the correlation between the IR and AE characteristics. The following relationships were established: (1) infrared radiation counts (IRC) and acoustic emission ringing-down count (AEC) have simultaneous and sudden changes in all sandstones before final failure. (2) during the compression process, the DIR shows a trend of fluctuating increase → rising fluctuation amplitude → peak → sudden drop, and this trend is similar to the development of the AEC count correlation dimension (DAE). This indicates that the IR on the sandstone surface has fractal characteristics and is consistent with the internal fracture process, which is an orderly process of dimensionality reduction. (3) The average stress at the DIR sudden drops is 90.3% of the peak value, while the time leading to the peak stress and final failure is 30.5 s and 80.8 s on average, respectively, suggesting that the sudden drop of DIR after reaching the peak can be regarded as the precursor information of sandstone fracture and stability loss. These research results provide a theoretical basis and data support for the use of IR to monitor and predict sudden and brittle rock mass instability and damage.
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Acknowledgements
This article was supported by Liaoning Provincial Department of Education Scientific Research Project (L2020050), the Doctoral Research Fund of Liaoning Province (2021-BS-247), the Basic Scientific Research Project of Education Department of Liaoning Province (LJKMZ20220750) and the Talent Introduction Scientific Research Start-up Foundation of Liaoning Petrochemical University (2019XJJL-025).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by HS. The first draft of the manuscript was written by HS, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Sun, H., Zhu, H., Shi, C. et al. Precursor Development of Sandstone Failure Using IR to Measure the Fractal Characteristics. Geotech Geol Eng 41, 3389–3401 (2023). https://doi.org/10.1007/s10706-023-02464-y
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DOI: https://doi.org/10.1007/s10706-023-02464-y