Coal–rock dynamic disasters often occur under the coupling effect of gas and stress. However, in engineering practice, coal–rock has different types of damage, and so, it is necessary to further study the physical characteristics of coal–rock containing gas under damage conditions. This is even more valuable in guiding relevant practical engineering. Based on this, a self-developed experimental system for monitoring the temperature change of coal–rock containing gas rupture was used to carry out uniaxial compression infrared monitoring experiments on fractured coal under different gas pressures, and in this way, the effects of gas pressure on the mechanical properties and infrared response characteristics of fractured coal were investigated. MATLAB was used for image processing and combined with the principle of statistics to extract the cracks information, and parameters such as crack length–quantity fractal dimension, crack image fractal dimension, and the maximum infrared radiation temperature (MIRT) time-series correlation fractal value were introduced for the characterization, which revealed the influence of gas pressure on it. It was found that, with increase in gas pressure, the N_T (the number of surface cracks) increased, and the L_A (the average trace length of the cracks) decreased when the crevasse coal was destroyed. Both the D_L (the crack length–quantity fractal dimension) and the D (the fractal dimension) of crack images increased with increase in gas pressure; the gas had an inhibitory effect on the sudden change of the temperature field on the surface of coal, but on the contrary, it enhanced its fluctuation, and with increase in gas pressure, the MIRT was transformed from surge to sudden drop when the specimen was damaged, and the D_C (the correlation fractal value) was linearly decreasing. The results explain the deterioration mechanism of fractured coal under the gas, reveal the influence of gas pressure on its infrared response, and have certain positive significance for disaster monitoring of similarly damaged coal.

煤岩动力灾害往往是在瓦斯与应力的耦合作用下发生的。但在工程实践中，煤岩存在不同类型的损伤，因此有必要进一步研究损伤条件下含瓦斯煤岩的物理特征。这对于指导相关实际工程更有价值。在此基础上，采用自主研发的含瓦斯破裂煤岩温度变化监测实验系统，对不同瓦斯压力下裂隙煤进行单轴压缩红外监测实验，研究瓦斯压力对瓦斯破裂温度变化的影响。研究了裂隙煤的力学性能和红外响应特性。利用MATLAB进行图像处理，结合统计学原理提取裂纹信息，以及裂纹长度-数量分形维数、裂纹图像分形维数、最大红外辐射温度（MIRT）时间序列相关分形值等参数引入了表征，揭示了气体压力对其的影响。研究发现，随着瓦斯压力的增加，裂隙煤破坏时N _T（表面裂纹数量）增加，而L _A（裂纹平均痕量长度）减少。裂纹图像的D _L（裂纹长度-数量分形维数）和D （分形维数）均随着气体压力的增加而增加；气体对煤表面温度场的突变有抑制作用，但相反却增强了其波动性，并且随着气体压力的增加，试样在受压时MIRT由激增转变为突变。受损，D _C（相关分形值）呈线性下降。研究结果解释了瓦斯作用下裂隙煤的劣化机理，揭示了瓦斯压力对其红外响应的影响，对类似破损煤的灾害监测具有一定的积极意义。