煤炭工程 ›› 2018, Vol. 50 ›› Issue (9): 83-87.doi: 10.11799/ce201809023

• 研究探讨 • 上一篇    下一篇

动载诱发近直立煤层水平分段开采冲击矿压的数值模拟研究

李安宁1,窦林名2,王正义1,曹晋荣1,王崧玮1,山长昊3   

  1. 1. 中国矿业大学
    2. 中国矿业大学煤炭资源与安全开采国家重点实验室
    3. 江苏省徐州市中国矿业大学—南湖校区
  • 收稿日期:2017-09-20 修回日期:2017-10-25 出版日期:2018-09-20 发布日期:2018-12-18
  • 通讯作者: 窦林名 E-mail:lmdou@126.com

Numerical simulation of rock-burst of the horizontal sectional mining of near-vertical coal seam under dynamic load

  • Received:2017-09-20 Revised:2017-10-25 Online:2018-09-20 Published:2018-12-18

摘要: 针对近直立煤层特殊的赋存条件和水平分段开采的技术条件,建立顶底板夹持梁的力学模型,对诱发冲击的动静载力源进行简要分析。基于分析结果采用FLAC3D数值模拟方法分析了动载作用下近直立特厚煤层工作面煤体应力、位移等的动态响应特征,进而揭示了冲击显现机制。结果表明:在顶底板围岩破裂产生震动效应传播而来的冲击载荷扰动下,近直立煤层工作面底煤水平应力先升高后瞬间大幅降低,垂直位移也突然增大,煤体自身平衡状态被打破,易诱发冲击显现。基于近直立煤层冲击诱发机制,提出了煤体卸压爆破和顶、底板预裂爆破等解危措施并在现场实施,解危效果显著。

关键词: 近直立特厚煤层, 水平分段开采, 数值模拟, 冲击矿压

Abstract: Based on the special conditions of the near-vertical coal seam and the technical conditions of horizontal sectional mining, a mechanical model of the clamping beam is established, a brief analysis is made on the dynamic and dynamic capacity of the induced impact. Based on the analysis results, the dynamic response characteristics of coal stress, displacement and other dynamic characteristics of the working face of near-vertical strata under dynamic load are studied by means of FLAC3D, the mechanism of rock-burst is revealed. Results show that the mining field is affected by the vibration of the external rock mass under static load stability, the mining face below horizontal stress instantaneous sharply lower after rising first, vertical displacement has increased suddenly, its balance is broken, cause rock-burst. The research results show the impact mechanism and the prevention and control of the horizontal sectional mining of near-vertical coal seam.

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