微震法在煤与瓦斯突出监测与预报中的应用
Application of Microseismometry in Coal and Gas Outburst Monitoring and Forecasting
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摘要: 瓦斯在煤岩体中的流动和冲击会产生弹性波,通过监测并分析该弹性波,提前预测煤的受力状态,并对应力集中源进行定位,以达到提前预测煤与瓦斯突出的目的。采用SOS微震监测系统,针对海孜煤矿Ⅱ1026机巷"4.25"煤与瓦斯突出的现场实测,取得了如下主要结论:①提出煤与瓦斯突出综合预测指标:震动能量和频次、微震活动度S及断层总面积A(t);②煤与瓦斯突出发生在频度和能级出现急剧增加后、微震活动度增强后、以及断层总面积出现高值异常后;利用上述指标,可以为矿井煤与瓦斯突出预测提供依据与经验。Abstract: By monitoring and analysis of the elastic wave which appears as gas flows and gas shocks in coal and rock,it is possible to forecast coal's stress state and to locate the source of stress concentration so that to achieve the outburst forecast of coal and gas in advance.With SOS microseismic(MS) monitoring system,the outburst of coal and gas happened at No.1026 working face in the conveyor roadway of Haizi mine on April 25 was measured on-site.The achieved results are as follows.Three indexes were proposed for outburst forecasting of coal and gas that were seismic energy and seismic frequency,seismicity S and total fault area A(t).After seismic energy and frequency increased dramatically,seismicity enhanced and total fault area appeared abnormal high value,coal and gas outburst would happen.Basis and experience were proposed for outburst forecasting of coal and gas by the above three indexes.
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Keywords:
- elastic wave /
- coal and gas outburst /
- microseismic monitoring system /
- index
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