(1. College of Municipal and Environmental Engineering，Henan University of Urban Construction，Pingdingshan，Henan 467036，China；2. College of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454000，China；
3. State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization，Jiaozuo，Henan 454000，China)
Abstract：To explore the characteristics of the infrared radiation response of coal bodies under the action of gas and stress，the self-developed experimental system for detecting the temperature change of gas-bearing coal rock rupture was used to analyze the mechanical properties and infrared radiation characteristics of coal samples from Pingcoal Mine 11th under different gas pressures，and to compare the time-varying characteristics of differential maximum radiation temperature ΔTMIR，cumulative differential temperature ΣΔTMIR and thermal image evolution under different gas pressures. The comparative analysis of the time-varying properties of differential maximum radiation temperature ΔTMIR，cumulative differential temperature ΣΔTMIR and thermal evolution at different gas pressures were carried out. The results show that，with the increase of the gas pressure，the damage pattern of the specimens changes from single-slope shear damage to shear-tension instability damage，and the damage development increases significantly. The peak compressive strength and the elastic modulus of the specimens decrease with the increase of the gas pressure，and the peak strain shows an increase and then a rapid decrease. The specimens show an overall warming trend at different gas pressures，with a warming precursor before rupture at low gas pressures(0–0.4 MPa) and a cooling precursor at high gas pressures(0.6 and 0.8 MPa). The low-temperature anomalous stripes and high-temperature anomalous regions appear during loading of the specimens and are consistent with the macroscopic crack orientation and location. The response mechanisms of infrared radiation from coal rocks under the influence of gas are revealed，including thermoelastic effect，frictional heat effect，gas expansion heat absorption effect，and adsorbed gas desorption heat absorption effect，with different degrees of influence of the thermal effect at different loading stages. The results of the study explain the causes of abnormal temperature variations of coal rock gas dynamic disasters and clarify the characteristics of infrared warning precursors under different gas pressures，which can be used for targeted disaster monitoring and warning according to the magnitude of gas pressure in mines.
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2023, Vol. 42 
