Abstract: In order to study the mechanical properties of coal rock at different loading rates and the infrared precursor information of its instability failure,under different loading rates,the TP coupling testing machine and high-precision infrared thermal imager,and five loading rates of 0. 01,0. 02,0. 03,0. 04 and 0. 05 mm/ s were used to perform uniaxial compression tests,and the test results showed that the proportion of elastic deformation stage of coal rock line was significantly reduced by the increase of loading rate. The temperature difference between the peak and minimum value of the average temperature curve of coal rock decreases with the increase of loading rate. The increase of loading rate hinders the early time point of the cooling precursor phenomenon of coal rock instability failure.

Key words: coal rock,loading rate,infrared radiation temperature,mechanical properties