安顺煤矿煤岩电磁辐射测试技术研究

Research on Electromagnetic Radiation Testing Technology for Coal Rock in Anshun Coal Mine

随安顺煤矿开采深度的加深,工作面回采时异常动力灾害发生的危险性显著提高。为防范灾害事故,可基于煤岩受载破坏过程电磁辐射强度与煤岩破坏的相关性,采用电磁辐射仪测试煤岩体的损伤破坏状态,对煤岩体动力灾害事故危险性进行预测,通过设置三采区轨道下山、四采区轨道风门0~300 m处为对照组,对四采区轨道、回风、胶带三条下山掘进巷道进行煤岩电磁辐射测试,并对其监测数据进行规律分析。研究结果表明:掘进作业严重影响巷道内应力分布与煤岩破坏状态,靠近掘进点的部位所受应力扰动更为明显,掘进较深、支护稳定的巷道所受影响较小;巷道危险区的煤岩电磁辐射强度相对较高;存在断层时,断层周围电磁辐射信号较强;掘进煤巷的应力受扰动情况比岩巷更加稳定,且所受应力普遍较小。

With the deepening of mining depth in Anshun Coal Mine,the danger of abnormal dynamic disasters occurring during stoping in the working face is significantly increased.To prevent disasters and accidents,based on the correlation between electromagnetic radiation intensity and coal rock damage during the loading and failure process of coal rock,an electromagnetic radiometer can be used to test the damage and failure status of coal and rock masses,predict the danger of dynamic disaster accidents in coal and rock masses.By setting the No.3 mining area track downhill and the No.4 mining area track air door at 0-300 m as control groups,the coal rock electromagnetic radiation testing on three downhill excavation roadways in the No.4 mining area:track,return air,and tape is conducted,and analyze the regularity of the monitoring data.The research results indicate that excavation operations seriously affect the stress distribution and coal rock failure state inside the roadway,the stress disturbance is more pronounced near the excavation point,the impact on roadways with deeper excavation and stable support is relatively small;The electromagnetic radiation intensity of coal rock in the danger zone of the roadway is relatively high;When there is a fault,the electromagnetic radiation signal around the fault is strong;The stress disturbance situation in excavation coal roadways is more stable than that in rock roadways,and the stress is generally smaller.