电磁辐射法监测煤层注水防突效果的研究

Study on Technique of Using Electromagnetic Emission to Monitor the Effect of Coal and Gas Outburst Prevention by Water Injection to Coal Seam

理论分析了水对煤体物理力学性质和煤体电磁辐射信号影响的规律。煤层注水过程中由于压力水对注水钻孔周围煤体的压裂,煤体产生的电磁辐射值增大,煤层注水结束后,煤体弹性得以充分释放,电磁辐射值比注水前相对降低。探讨了现场采用电磁辐射监测煤层注水防突效果的实施方案。研究结果表明:电磁辐射法可以用来监控煤层注水过程以及检测煤层注水防治煤与瓦斯突出效果。

The affect laws of water on the physical and mechanical properties and electromagnetic emission （EME） characteristic of coal were analyzed. The coal around borehole was fractured due to the high water pressure during the process of water injection to coal seam, so the value of coal EME increased. Because the elastic energy of coal was fully released after water injection, the value of coal EME was lower than that before water injection. A implementing program of using EME to in - situ monitor the effect of coal and gas outburst prevention by water injection to coal seam was discussed. The results showed that the EME method can be used to monitor the process of water injection to coal seam and to measure the effect of coal and gas outburst pre- vention by water injection to coal seam.