基于微震CT反演的冲击危险综合评价指标研究

Research on comprehensive evaluation indicator of rock burst risk based on microseism CT inversion

首先介绍了微震CT反演的基本原理及相应的三个CT评价指标,然后基于微震CT反演结果和现场电磁辐射监测数据,分析了三个CT评价指标和电磁辐射强度之间的相关性,确定存在明显的相关关系。采用主成分分析方法得出了三个CT评价指标对应的三个主成分,通过各主成分贡献率大小确定采用第一主成分Y1可以有效的代替三个单一的CT评价指标。最后,采用第一主成分Y1重新对工作面冲击危险性进行评价,并发现新的冲击危险区,表明新的综合评价指标Y1更加全面可靠,对于工作面CT评价冲击危险具有重要意义。

First, the basic principle of microseism CT inversion and three CT evaluation indicators is introduced, and then the correlation between the three CT evaluation indicators and electromagnetic radiation strength is analyzed with the result of microseism CT inversion and the monitoring electromagnetic radiation data in field, which shows apparent correlation. Furthermore, three principal components corresponding to the three CT evaluation indicators are calculated by principal component analysis method, and with the contribution rate value of different principal component, it is determined that the first principal component Y1 can replace the three single CT evaluation indicator effectively. Finally, the first principal component Y1 was used to re-evaluate the impact of risk on the work face and finds a new danger area, indicating that the new comprehensive evaluation indicator Y1 is more general and reliable and has a great significance to the risk evaluation of rock burst.