Study On Infrared Radiation Characteristics Of Coal Rock Fracture

The role of coal in China's economic development is self-evident.Mine power disasters in coal mine accidents have a serious impact on coal mining.Mine dynamic disasters are the result of coal and rock damage evolution.Studying the damage evolution law and infrared radiation change law during coal and rock destruction is helpful to predict and predict mine dynamic disasters.Based on the damage theory,this paper establishes the damage constitutive model of coal rock fracture,analyzes the damage variable curve and stress-strain curve in the process of coal body failure,and divides the coal body failure process into five stages: the micro-crack compaction stage and the linear elastic deformation stage(the damage is zero).The stable growth stage of the microcrack and the unstable growth stage of the microcrack(the damage starts to increase);Fracture stage(rapid increase in damage).Use Image IR 8300 infrared thermal imager real-time monitoring the temperature of the coal sample loading data,through the analysis of the data found that loading coal fracture zone of the infrared radiation temperature online the elastic deformation stage after increases,but the overall infrared radiation temperature of coal in the burst phase DE or after reaching the peak stress point D,will tend to be slow.The rising trend of the maximum infrared radiation temperature in the fracture region increases after the stress peak.These can be used as harbingers of coal fractureThe study found that the temperature change of the infrared radiation of the coal body during loading is closely related to the porosity distribution of the coal body.The temperature changes in the region with large porosity during loading are large and are destroyed first.The change of the average infrared radiation temperature and the stress between the coal body and the stress peak have a good linear positive correlation.The relationship between the mechanical work and the infrared radiation temperature during loading is approximately a cubic curve,and the infrared radiation temperature of the coal body is related to the conversion of the mechanical work.