煤炭工程 ›› 2015, Vol. 47 ›› Issue (1): 81-84.doi: 10.11799/ce201501026

• 研究探讨 • 上一篇    下一篇

层间有完整厚岩层的保护层作用研究

张恩强1,刘仓1,王飞龙2,李军3,曹宇翔1,姜俊博1   

  1. 1. 西安科技大学能源学院
    2. 西安科技大学 能源学院
    3. 能源学院
  • 收稿日期:2013-12-15 修回日期:2014-02-20 出版日期:2015-01-10 发布日期:2015-01-10
  • 通讯作者: 刘仓 E-mail:liucangww@163.com
  • 基金资助:
    陕西省自然科学基金资助项目;陕西省岩层控制重点实验室项目

The Study of Liberating Effect of Protective Coal-seam When The Interlayer Has Thick and Intact Rock Layer

  • Received:2013-12-15 Revised:2014-02-20 Online:2015-01-10 Published:2015-01-10

摘要: 为实现煤与瓦斯突出煤层的安全高效开采,运用现场实测、力学分析与数值模拟的方法,研究了保护层与被保护层间有完整厚“屏障”岩层时,该完整厚岩层对瓦斯释放作用的影响。分析了上保护层开采过程中,完整厚“屏障”岩层的应力变化规律和破坏规律。研究结果表明:保护层开采后,该岩层中应力减小到原岩应力的43%,岩层通透性增大;底板塑性区穿过完整厚“屏障”岩层,深度超过20m,岩层出现的新裂隙与旧裂隙贯通形成“瓦斯通道”,一般破坏发生在煤壁后方5m左右的底板中;说明了保护层作用不受该完整厚岩层控制,被保护层在开采过程中,采空区残留的解析瓦斯可能造成工作面上隅角瓦斯积聚,生产过程中要加强瓦斯监控。

关键词: 保护层, 瓦斯运移, FLAC3D, 裂隙发育, 屏障岩层, 底板应力分布

Abstract: In order to achieve the safe and efficient mining in coal and gas outburst coal seam using the method of field measurement and numerical simulation, studied the liberating effect of stress and gas and gas when the interlayer has thick and intact rock layer. And analyzed the rule of stress change and rock damage. The results show that stress of floor is released which is 43% of in-sute stress and the depth of floor damaged is over 20 meters. The failure occurs in the rear 5m of longwall face. New fractures and old ones generated the gas channel, and gas release effect is obvious. But in the process of mining, goaf residue gas may accumulate in the top corner of air-return way side, mine should strengthen the gas monitoring.

Key words: protective coal-seam, gas migration, FLAC3D, fracture development, "barrier", rock seam, floor damage mechanism

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