预制裂纹煤样受载破坏的红外辐射特征研究

Research on infrared radiation characteristics of pre-cracked coal sample under loaded breaking

对预制裂纹煤样进行了单轴压缩实验,研究了预制裂纹煤样受载破坏过程中红外辐射温度及其变化规律。实验结果表明:预制裂纹煤样在受载破坏过程中,红外辐射温度曲线出现突变现象,主破裂时不同预制裂纹角度煤样的红外辐射温度均突升;主破裂时预制裂纹煤样的红外辐射温度突变率随预制裂纹角度的增大先升后降,45°预制裂纹煤样的红外辐射温度突变率最大。预制裂纹煤样的红外辐射变化规律与载荷及预制裂纹密切相关,能够很好地反映含宏观缺陷煤样受载时内部破裂的情况。

Uniaxial compression test was conducted on pre-cracked coal sample,and infrared radiation temperature and its change rule of the pre-cracked coal sample under loaded breaking were researched.The experimental results show that infrared radiation temperature curve will mutate in process of loaded breaking of the pre-cracked coal sample,and the infrared radiation temperatures of the pre-cracked coal samples with different angles will suddenly increase during main rupture.The mutation rate of infrared radiation temperature increases first and then decreases with increase of pre-cracked angle during main rupture,and the mutation rate of infrared radiation temperature of the pre-cracked coal sample with 45°is the largest.The change rule of infrared radiation of the pre-cracked coal sample is closely related to loadand pre-crack,which can reflect internal rupture of macroscopic defective coal sample under load.