Abstract
Previous experiments indicated that infrared radiation temperature (IRT) was applied in monitoring rock stress or rock mass fracturing, and abnormal IRT phenomena preceding rock failure or tectonic earthquakes were frequently reported. However, the characteristics of IRT changing with rock fracturing and frictional sliding are not clear, which leaves much uncertainties of location and pattern identification of stress-produced IRT. In this study, we investigated carefully the localized IRT enhancement of rock compressively sheared to fracturing and sliding (named as CSFS) with marble and granite specimens. Infrared thermogram and visible photos were synchronously observed in the process of rock CSFS experiment. We revealed that localized IRT enhancement was determined by local stress locking, sheared fracturing, and frictional sliding, and the relations between the Kcv of IRT and the shear force are almost linear in wave length 3.7–4.8 μm. In the process of rock CSFS, the detected ΔIRT which resulted from thermoelastic effect is 0.418 K, while the detected ΔIRT resulted from friction effect reaches up to 10.372 K, which is about 25 times to the former. This study is of potential values for infrared detection of rock mass failure in engineering scale and satellite remote sensing of the seismogenic process in the regional scale.
Highlights
Earthquake is one of the most unexpected and most serious natural disasters, which is mainly resulted from the local locking of crustal stress and the sudden fracturing of rock mass or tectonic faults (Liu et al, 2016; Huang et al, 2018)
We investigated carefully the localized infrared radiation temperature (IRT) enhancement of rock compressively sheared to fracturing and sliding with marble and granite specimens
We revealed that localized IRT enhancement was determined by local stress locking, sheared fracturing, and frictional sliding, and the relations between the Kcv of IRT and the shear force are almost linear in wave length 3.7–4.8 μm
Summary
Earthquake is one of the most unexpected and most serious natural disasters, which is mainly resulted from the local locking of crustal stress and the sudden fracturing of rock mass or tectonic faults (Liu et al, 2016; Huang et al, 2018). Referring to the pioneering work of Geng et al (1992) and Wu et al (2000) in remote sensing rock mechanics (RSRM), the IRT change of stressed rock was investigated by many scholars (Wu et al, 2006a, 2006b; Liu et al, 2006; Liu et al, 2018; 2021; Wang et al, 2016; Salami et al, 2017; Huang et al, 2018; Huang et al, 2021; Zhao et al, 2019; Zhou et al, 2019; Cao et al, 2020; Huang et al, 2021; Yang et al, 2021) and applied to explore the rock fracturing behavior and related abnormal phenomenon. Watson et al (1975) used IRT images to identify the near-surface physical state of geologic materials, by using a quantitative theoretical model for geothermal mapping and thermal inertia mapping, and Schöpa et al (2011) utilized IRT images to determine the vent locations by stress field modeling in a Vulcano island, Italy
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