We studied the infrared radiation (IR) characteristics of sandstone cracks with different water contents. We propose a new IR-based method to distinguish the initial development and damage point of cracks. The maximum variation of IR variance shows a quadratic relationship with water content. By defining crack initiation and damage using a stiffness stress curve, it can be concluded that the crack initiation and crack damage IR variance thresholds show a quadratic relationship with water content. The proportion of the two thresholds at the maximum IR variation amplitude does not change with increasing water content, yielding ratios of 47.51% and 78.19% for crack initiation and crack damage, respectively. The rock stress threshold of crack initiation and damage show a negative logarithmic relationship with their respective IR variance thresholds with correlation coefficients above 0.90.
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Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 3, p. 10, May-June, 2021.
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Cao, K., Yuan, Q., Xie, G. et al. Infrared Radiation Characteristics During Crack Development in Water-Bearing Sandstone. Soil Mech Found Eng 58, 209–214 (2021). https://doi.org/10.1007/s11204-021-09730-2
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DOI: https://doi.org/10.1007/s11204-021-09730-2