综放工作面过单面见方冲击危险性多参量监测预警分析

Multi-parameter monitoring and early warning analysis of impact risk in fully mechanized caving face passing square

工作面在过见方位置时,上覆岩层会发生剧烈变动,容易引发冲击地压等一系列矿压显现问题;基于微震、矿压、应力、震源CT等监测数据,对工作面见方阶段监测结果进行研究。结果表明:微震事件数和能量数在见方前3~6 d发生显著增加;见方期间来压工作阻力和非来压工作阻力均显著大于非见方期间,并且矿压数据在工作面接近见方位置时才明显增加;超前支承压力在见方前也会增加,其值显著大于一般采动的影响;接近见方位置冲击地压危险性指数也显著增大;接近见方位置时应力监测、微震监测、矿压监测数据会先后发生不同程度上升现象,并持续一段时间。综上微震监测、采动应力监测和震源CT监测均可作为工作面见方的监测预警指标,据此提出了"力—震动—能量"的见方一体化监测预警体系。

When the working face is passing the square position, the overlying rock strata will change drastically, which is easy to cause a series of rock pressure problems such as rock burst. Based on the monitoring data of microseismic, mine pressure, stress,CT, etc., the monitoring results in the square phase of the working face are researched and summarized. The research results show that in 307 working face, the number of microseismic events and the number of energy increased significantly in 3-6 days before the square;the resistance of incoming pressure and the resistance of non-compression work during the square period are greater than those during the non-square period, and the rock pressure data is close to the working surface significant increase occurs when the square position;the leading support stress will also increase before the square, and its value is greater than the impact of general mining;the risk index of rock burst near the square also increased significantly;approaching to the square position, the stress monitoring, microseismic monitoring and mine pressure monitoring data will successively increase to different degrees and last for a period of time. Microseismic, rock pressure, stress and CT can be used as monitoring and early warning indicators of 307 working face to guide the work of working face pressure relief, and a monitoring and early warning system including "force-vibration-energy"is proposed.