向斜轴部附近微震活动规律及对冲击矿压的影响
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摘要
根据波兰SOS微震监测系统所得到的微震数据,结合砚北煤矿250204工作面的实际情况,具体分析了向斜轴部附近的震源演化规律,得出结论:工作面回采期间,当工作面处于向斜轴部时,震源主要分布在煤层上侧,即微震事件主要发生在顶板附近;当回采工作面逐渐远离向斜轴部时,震源分布有向煤体下侧转移的趋势,即微震事件主要发生在底板附近。当向斜轴部和工作面见方2因素相叠加时,发生冲击的可能性明显增大。同时总结了向斜构造发生冲击矿压的能量频次规律,对生产实践起到重要作用。
According to the data of Poland SOS microseismic monitoring system,the seismic source evolution law near the synclinal axis is analyzed combining with the actual conditions of 250204 working face in Yanbei.The conclusions are as follows: during the period of mining,and when the working face is in the synclinal axis,the seismic source are mainly distributed above the coal seam,that is,the microseismic activity mainly occurs near the roof.When the working face is moving away from the synclinal axis gradually,seismic source distributions have a tendency to the lower side of coal seam,which means that the micro-seismic activity occurs mainly near the floor.When the two factors of syncline axis and the working face square overlay,rock burst tendency increases significantly.At last,the energy-frequency law of rock burst for synclinal axis tectonic is summarized which plays an important role in the production practice.
According to the data of Poland SOS microseismic monitoring system,the seismic source evolution law near the synclinal axis is analyzed combining with the actual conditions of 250204 working face in Yanbei.The conclusions are as follows: during the period of mining,and when the working face is in the synclinal axis,the seismic source are mainly distributed above the coal seam,that is,the microseismic activity mainly occurs near the roof.When the working face is moving away from the synclinal axis gradually,seismic source distributions have a tendency to the lower side of coal seam,which means that the micro-seismic activity occurs mainly near the floor.When the two factors of syncline axis and the working face square overlay,rock burst tendency increases significantly.At last,the energy-frequency law of rock burst for synclinal axis tectonic is summarized which plays an important role in the production practice.
引文
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[11]李许伟,窦林名,等.褶皱附近微震活动规律分析[J].煤矿安全,2011,42(11):115-118.
[2]窦林名,何学秋.冲击矿压防治理论与技[M].徐州:中国矿业大学出版社,2001.
[3]张登龙.谈褶曲构造对煤矿生产的影响[J].矿业安全与环保,2002(6):89-90.
[4]陈国祥,窦林名,等.褶皱区应力场分布规律及其对冲击矿压的影响[J].中国矿业大学学报,2008,37(6):751-755.
[5]王国瑞,窦林名,等.工作面过褶曲时微震活动规律研究[J].煤炭工程,2010(3):71-74.
[6]谢卓娟,吕悦军,等.渤海海域地震震源深度的分布特征[J].震灾防御技术,2008,3(3):311-320.
[7]徐芝纶.弹性力学[M].北京:高等教育出版社,2007.
[8]谢新生.挤压带褶皱构造力学解析及其他地震意义[J].地震学报,1999,21(3):278-284.
[9]李铁,蔡美峰,蔡明.采矿诱发地震分类的探讨[J].岩石力学与工程学报,2006,25(10):36-79.
[10]李铁,蔡美峰,蔡明.采矿诱发地震三个特征震源深度的探讨[J].岩石力学与工程学报,2007,26(8):1546-1552.
[11]李许伟,窦林名,等.褶皱附近微震活动规律分析[J].煤矿安全,2011,42(11):115-118.
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