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为了研究预制裂纹岩板破坏电位和电磁辐射变化规律,对不同裂纹倾角花岗岩板进行了不同加载速率单轴压缩实验.结果表明:预制裂纹岩板电位和电磁辐射随载荷的变化而变化,破坏前出现电磁辐射能量峰值和一定的电位峰值,电位和电磁辐射能量增量与变化率一般会出现突变;电位变化幅度及其破坏前均值与距离主破裂的位置有关;预制裂纹倾角越大,载荷峰值越小,其出现时间越早,电磁辐射能量峰值越靠近载荷峰值,破坏前电磁辐射能量均值越低;加载速率越大,电磁辐射能量超前破坏时间越短.电磁辐射能量与电位增量、变化率、标准差、均值、变异系数可以作为研究煤岩破坏前兆特征的指标.
In order to study the damage potential of pre-cracked rock and the variation rule of electromagnetic radiation, the uniaxial compression tests of granite slab with different crack angles under different loading rates were carried out. The results show that the pre-cracked rock plate potential and electromagnetic radiation vary with load, The peak value of electromagnetic radiation energy and certain potential peak appears, and the increment and rate of change of potential energy and electromagnetic radiation generally appear to be abrupt; the range of potential variation and its pre-destruction mean value are related to the location of main rupture; the larger the pre-crack crack angle is, The earlier the electromagnetic radiation energy peak comes closer to the peak value of load, the lower the average energy of the electromagnetic radiation before the damage is. The larger the loading rate is, the shorter the damage time of the electromagnetic radiation energy is. Rate, standard deviation, mean, coefficient of variation can be used as indicators of coal and rock damage precursors.