Abstract
To better investigate the effect of high temperatures on the b-values of acoustic emissions (AEs), the fracturing of sandstone when subjected to uniaxial compression testing after different heat treatments is monitored by examining the AEs. The results show that the b-values are rapidly reduced around the yield stress and reduce to the lowest value at the peak stress during the loading process. After 550°C, the b-value of the yield stress of sandstone begins to decrease with temperature increases. On the other hand, there is a rapid increase in the b-value when the temperature is 700°C. The changes in the b-values mainly depend on the loading stress and thermal damage to the quartz particles or the boundaries of the quartz particles and other minerals (especially at around 573°C, which corresponds to the phase transition of quartz in the sandstone). The research results of this paper have important guiding significance for geotechnical engineering under high-temperature conditions, which can be used for rock stability monitoring and disaster early warning.
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This research was supported by the National Natural Science Foundation of China (Grant Nos. 41672279, 41972288).
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Responsible Editor: Zeynal Abiddin Erguler
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Ge, Z., Sun, Q. & Zhang, H. Changes in b-values due to sandstone failure after exposure to high temperatures. Arab J Geosci 14, 1202 (2021). https://doi.org/10.1007/s12517-021-07604-3
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DOI: https://doi.org/10.1007/s12517-021-07604-3