为了探讨破坏程度不同煤体的力学行为、红外辐射及裂隙演化特征，进行了单轴压缩过程中同步红外辐射检测试验，分析了不同试样受载后力学行为及红外辐射响应特征。在试样宏观力学特性的基础上，采用颗粒流PFC2D对试样单轴压缩进行模拟，从细观尺度上分析了试样裂隙的演化特征。研究结果表明：破坏程度影响了试样的强度、变形特征，随着破坏程度的增强，试样表现出弱脆性、强塑性特征；破坏程度不同试样均表现出增温的时变特征，I类、II类试样临破裂前温度出现骤增的前兆特征，温度突增可达1.7 ℃左右，而III类试样则表现为先骤降后快速上升的变化特征，温度增加0.93 ℃；加载过程中红外热像出现分异特征，高温或低温异常区域对应着煤岩试样破坏的空间位置；试样破坏区域与红外辐射异常区域大致相同，内部损伤（裂隙发育）与表面损伤（红外辐射）有着密切的关联性。该研究结果可为破坏程度不同煤体采掘过程中的动力灾害预警提供参考。To investigatethe mechanical behavior

infrared radiation

and fracture evolutioncharacteristics of coal with different degrees of damage

simultaneous infraredradiation detection tests were carried out during uniaxial compression toanalyze the mechanical behavior and infrared radiation response characteristicsof different specimens after loading. And then based on the macroscopicmechanical properties of the specimens

particle flow software PFC2D was used to simulate the uniaxial compression of the specimens to analyze thefracture evolution characteristics of the specimens on a meso-scale. Theresults show that the degree of damage affects the strength and deformation characteristicsof the specimens. With the increase of the degree of damage

the specimens showweak brittleness and strong plasticity characteristics; the specimens withdifferent degrees of damage all show time-varying characteristics oftemperature increase; the temperature of Class I and Class II specimens show aprecursor of a sudden increase before rupture

with a sudden increase oftemperature up to about 1.7 ℃

while Class III specimens show thecharacteristics of a sudden drop followed by a rapid increase

with atemperature increase of 0.93 ℃. The thermal infrared images show divergentcharacteristics during the loading process

with the high or low-temperatureanomalies corresponding to the spatial location of the damage to the coal rockspecimens. The damaged area of the specimens is approximately the same as theanomalous area of the infrared radiation

and there is a close correlationbetween the internal damage (fracture development) and the surface damage(infrared radiation). The results of the study can provide a reference for theearly warning of dynamic hazards during the mining process of coal bodies withdifferent degrees of damage.