工作面强矿震事件的震动波CT时空预测技术

    Temporal and Spatial Forecasting of Strong Mine Earthquake Events Based on Shock Wave CT Technology

    • 摘要: 以某矿3307工作面回采期间的微震监测为基础,统计分析微震事件的震源能量和震动频次,并结合震动波CT技术动态预测强矿震事件。研究结果表明:利用震动波CT技术,反演得出煤层和顶底板切片波速异常系数An和波速梯度变化系数VG等值线云图,确定高波速正异常和高波速梯度异常区域,可从空间上划分出强冲击危险区域;分析微震事件的时间分布表,探讨每日震动总能量/频次与强矿震事件的耦合规律,结合波速异常系数An和波速梯度变化系数VG等值线云图,可从时间上确定冲击危险期;对比现场实测数据,在空间上和时间上均验证了预测结果的有效性。

       

      Abstract: Based on the micro-seismic monitoring data during the mining of a mine 3307 working face, we statistically analyzed the source energy and vibration frequency of micro-seismic events and dynamically predicted strong mine earthquake events with shock wave CT technology. Research results show that: by using shock wave CT technology, we calculated the wave velocity anomaly coefficient An and wave velocity gradient coefficient of variation VG contour map of coal seam, roof and floor, and determined high wave velocity positive anomaly and wave velocity gradient anomaly regions, spatially marked off strong dangerous area of rock-burst; by analyzing the time distribution table of micro-seismic events, we explored the coupling laws of daily total energy and frequency of micro-seismic and strong mine earthquake events, temporally determined the dangerous period of rock-burst by combining with An and VG contour map; compared with the field test data, the validity of the forecast results is verified in space and time.

       

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