采矿与安全工程学报 ›› 2015, Vol. 32 ›› Issue (2): 325-330.

• 论文 • 上一篇    下一篇

基于微震和应力动态监测的煤岩破坏与瓦斯涌出关系研究

  

  1. 1.中国安全生产科学研究院,北京 100012;2.北京科技大学土木与环境工程学院,北京 100083; 3.安徽理工大学能源与安全学院,安徽 淮南 232001;4.中国平煤神马能源化工集团有限责任公司方山分公司,河南 禹州 461670
  • 收稿日期:2013-11-25 出版日期:2015-03-15 发布日期:2015-06-23
  • 作者简介:尹永明(1985—),男,山东省临沂市人,博士,从事矿山动力灾害控制、微震监测工程等方面的研究。
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2010CB226803);国家自然科学基金项目(51174016);国家青年科学基金项目(51204010)

Relation between coal-rock failure and methane emission based on microseismic and dynamic stress monitoring

  • Received:2013-11-25 Online:2015-03-15 Published:2015-06-23

摘要: 采用微震监测技术、应力实时在线监测技术对方山矿新井11041 工作面回采过程中煤岩破坏与应力变化进行了实测研究,结合工作面抽放和风排瓦斯涌出量监测数据,得到了综采工作面煤岩破坏、应力变化和瓦斯涌出三者之间的关系。研究表明:1) 微震事件能量峰值的出现略早于工作面前方煤体应力极值和瓦斯抽放指数峰值,而工作面风排瓦斯涌出量峰值又略晚于瓦斯抽放指数峰值,可以根据微震事件能量变化来间接反映工作面煤体应力变化和瓦斯涌出情况;2) 工作面基本顶的周期性运动是诱发工作面风排瓦斯涌出量周期性变化的主要原因,当基本顶周期性断裂时,采空区瓦斯涌出增大,工作面风排瓦斯含量变大,且瓦斯主要来源于采空区积聚瓦斯。

关键词: 综采工作面, 微震监测, 应力实时在线监测, 煤岩破坏, 瓦斯抽放, 瓦斯涌出

Abstract: Microseismic and stress real-time monitoring techniques were applied to measure coal-rock failures and stress variations during mining process of LW11041 in Fangshan coal mine. Combined with methane emission and methane drainage data, the relation of coal-rock failure, stress variation and methane emission were studied in this paper. The results show that the peak energy of microseismic events occurs earlier than that of extreme coal stress and methane extraction index, while the peak value of methane emission occurs later than that of methane extraction index. Therefore, energy variation of microseismic events can be used to predict coal stress variation and methane emission around the coal face. In addition, the periodic weighting of basic roof is the main reason to result in the periodic changes of methane emission by ventilation. When the basic roof breaks periodically, the methane emission in goafing increases, the methane concentration by ventilation in face also increases, and the methane mainly comes from the methane accumulation in goafing.

Key words: fully-mechanized mining face, microseismic monitoring, stress real-time monitoring, coal-rock failure, methane drainage, methane emission