地震波层析成像技术在冲击地压防治中的应用

Application of seismic CT technology in rock burst prevention

文章首先介绍了地震波层析成像技术的应用原理和使用方法,以PASAT-M探测系统为平台,在现场实测数据基础上,通过计算机反演得到探测区域冲击危险性指数分布图,进而分析冲击危险所处区域,以及煤岩体内应力分布情况,据此可以评价冲击地压防治措施实施效果。基于以上原理,探测乌东南采区＋475水平B_（1＋2）煤层处于弱冲击等级,其中边界线两侧局部位置由于煤柱的存在,冲击危险性指数K值较高,达到0.5-0.75。因此,采用大孔径钻孔和煤层注水卸压,同样采用PASAT-M探测系统进行卸压措施评价,结果表明K值基本均在0.3以下,整体上冲击危险性明显降低。这表明地震波CT技术可满足现场对冲击危险性评价的需要,其结果实用可靠,为类似工程应用提供借鉴。

The application mechanism and method of seismic CT technology are introduced. With PASAT-M detection system as a platform,based on the measured data,the rock burst risk index distribution figure is obtained by computer inversion,to indicate the risky area of rock burst,and stress distribution in coal and rock mass,for effect evaluation of the prevention measures. The technology application in B_（1＋2）working face at level of ＋ 475 m in Wudong south mining area showed weak-burst level. Due to the coal pillar at the two sides of boundary line,burst hazard index K was high（ 0.5 -0.75）. The large aperture drilling and coal seam water injection were used to release stress. And PASAT- M detection system was used to evaluate the pressure relief measures. The results showed the K value fell below 0.3,the burst risk decreased significantly,seismic CT technology can meet the field application requirements and offer reliable results.