微震初至波在岩层中的传播路径研究
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摘要
为了合理解释微震初至波在岩层中传播路径,提高微震监测系统的监测精度,从现场微震波传播异常现象出发,利用地震波基础理论,分别以微震初至波在单一岩层和过岩层分界面的传播方式及路径建立了模型,着重分析了过岩层分界面时,震源与拾震器位于同一岩层中以及位于不同岩层中微震初至波的传播路径。在此基础上,优化了微震监测系统拾震器的布置原则,通过现场校检,微震监测系统水平方向定位误差由优化前的37.5 m降到5.7 m,垂直方向定位误差由33.4 m降低到3.0 m,一定程度上解决了微震波传播异常现象。
In order to rationally explain the spreading route of the micro-seismic initial arrival waves in the strata and to improve the monitoring and measuring accuracy of the micro-seismic monitoring and measuring system,from the abnormal phenomena of the site micro-seismic spreading,with the basis theory of the seismic wave,a model was established individually with the spreading way and route of the seismic initial wave in a single rock stratum and the interface of the passed rock strata.The analysis on the spreading route of the micro-seismic initial arrival wave when the seismic sources and the seismic collector in a same rock stratum or not in a same stratum as the initial wave passing the interface of the rock strata.Based on the circumstances,the seismic collector layout principle of the micro-seismic monitoring and measuring system was optimized.With the site correction,the horizontal directional position error of the micro-seismic monitoring and measuring system could be reduced from 37.5 m before optimized to 5.7 m and the vertical directional position error could be reduced from 33.4 m to 3.0 m.thus the abnormal phenomena of the micro-seismic spreading was solved in certain degree.
In order to rationally explain the spreading route of the micro-seismic initial arrival waves in the strata and to improve the monitoring and measuring accuracy of the micro-seismic monitoring and measuring system,from the abnormal phenomena of the site micro-seismic spreading,with the basis theory of the seismic wave,a model was established individually with the spreading way and route of the seismic initial wave in a single rock stratum and the interface of the passed rock strata.The analysis on the spreading route of the micro-seismic initial arrival wave when the seismic sources and the seismic collector in a same rock stratum or not in a same stratum as the initial wave passing the interface of the rock strata.Based on the circumstances,the seismic collector layout principle of the micro-seismic monitoring and measuring system was optimized.With the site correction,the horizontal directional position error of the micro-seismic monitoring and measuring system could be reduced from 37.5 m before optimized to 5.7 m and the vertical directional position error could be reduced from 33.4 m to 3.0 m.thus the abnormal phenomena of the micro-seismic spreading was solved in certain degree.
引文
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[10]苗素军,牟宗龙,窦林名,等.深部复杂地质条件下矿井冲击地压分析及防治[J].煤炭科学技术,2010,38(9):43-46.
[2]姜福兴,宋广东,孔令海,等.微地震波在煤矿岩层中的传播特征研究[J].岩石力学与工程学报,2009,28(1):91-96.
[3]夏永学,潘俊锋,王元杰,等.基于高精度微震监测的煤岩破裂与应力分布特征研究[J].煤炭学报,2011,36(2):65-69.
[4]姜福兴,王存文,杨淑华,等.冲击地压及煤与瓦斯突出和透水的微震监测技术[J].煤炭科学技术,2007,36(1):26-29.
[5]姚姚.地震波场与地震勘探[M].北京:地质出版社,2006:35-36.
[6]牛滨华,孙春岩.地震波理论研究进展:介质模型与地震波传播[J].地球物理学进展,2004,19(2):255-263.
[7]齐庆新,陈尚本,王怀新,等.冲击地压、岩爆、矿震的关系及其数值模拟研究[J].岩石力学与工程学报,2003,22(11):90-96.
[8]任勇.华丰煤矿微震监测与冲击地压影响因素分析[J].煤炭科学技术,2010,38(7):1-6.
[9]张宗文,安伯义,刘金亮,等.千米深井强冲击倾向煤层的冲击地压防治技术[J].煤炭科学技术,2010,38(7):17-20.
[10]苗素军,牟宗龙,窦林名,等.深部复杂地质条件下矿井冲击地压分析及防治[J].煤炭科学技术,2010,38(9):43-46.
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