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为提高矿山动力灾害预测准确率,应用自主研制的电荷传感器,将标准煤样置于三轴压力室内进行应力-电荷试验。分析围压对煤样压缩破坏过程中电荷信号的影响。结合现场测试,揭示工作面开挖过程中煤体应力与煤壁表面感应电荷的时间和空间变化规律。试验结果表明,煤体压缩过程中电荷信号的变化与煤体所处的应力水平关系密切,处于应力集中区域和应力松弛区域的煤体有明显脉冲状电荷信号,原始应力区电荷信号平稳,电荷信号的变化超前于煤体应力的变化,围压对电荷信号有延缓、强化的作用。
In order to improve the prediction accuracy of dynamic disaster in mines, a self-developed charge sensor was used to place a standard coal sample in a triaxial pressure chamber for stress-charge test. The effect of confining pressure on the charge signal during compression and destruction of coal samples was analyzed. Combining with the field test, the temporal and spatial variation of coal body stress and induced charge on coal wall surface are revealed. The experimental results show that the change of charge signal during the compressing of coal is closely related to the stress level of the coal. The coal in the stress concentration and stress relaxation regions has obvious pulse-like charge signal, the charge signal in the original stress region is stable, and the charge Changes in signal ahead of the changes in coal stress, confining pressure on the charge signal has been delayed, enhanced role.