加载速率对煤岩力学特性及红外辐射规律研究

Study on the Mechanical Characteristics of Coal Rock and the Law of Infrared Radiation of Loading Rate

为了研究煤岩在不同加载速率下的力学特性及其失稳破坏时的红外前兆信息,利用TP耦合试验机和高精度红外热成像仪,选取0.01、0.02、0.03、0.04和0.05 mm/s 5个加载速率对煤岩进行单轴压缩试验。结果表明:煤岩线弹性变形阶段占比在原生裂隙闭合阶段、线弹性变形阶段、失稳破坏阶段中随加载速率增大明显降低;煤岩平均红外温度最大最小温差随着加载速率增大逐渐缩小;煤岩失稳破坏时表现出降温前兆现象,增大加载速率对其提前发生具有抑制效果。

In order to study the mechanical properties of coal rock at different loading rates and the infrared precursor in-formation 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.