瓦斯压力对煤体冲击移动机理的影响
The Influence of Gas Pressure on Mobile Mechanism of Coal Rock Burst
-
摘要: 根据冲击地压发生地点的分布特征,结合朱集矿11-2#煤层的赋存条件,对2种不同瓦斯压力条件下的冲击地压发生过程进行数值分析,研究了冲击发生过程中的煤体移动机理,并得出了煤体破裂演化图、瓦斯流动状况图及应力分布曲线图。研究结果显示:不同瓦斯压力条件下的煤体破裂失效过程基本相同;在高瓦斯压力条件下,软煤初始破裂相对比较剧烈,瓦斯流量比较高,煤壁破坏深度更大,冲击地压灾害比较严重;煤层与顶板之间的滑移可以考虑为滚动摩擦。Abstract: Based on distribution characteristics of rock burst, combining with occurrence conditions of 11-2 coal seam in Zhuji Mine, the occurring process of rock burst is analyzed under the conditions of two gas pressures in paper. Mobile mechanism of coal is studied when rock bust occurs, and evolution pattern of coal fracture, gas flow state pattern and stress distribution curve are obtained. The results showed that coal fracture process is almost same under different gas pressures; soft coal fracture is relatively acute in initial stages under high gas pressure, i.e. higher gas flow, greater coal fracture depth, very serious rock burst; the slip can be regarded as rolling friction between coal seam and roof.
-
Keywords:
- gas pressure /
- rock burst /
- mobile mechanism /
- rolling friction /
- sliding friction
-
-
[1] 潘立友,张立俊,刘先贵,等.冲击地压预测与防治实用技术[M].徐州:中国矿业大学出版社,2006:1-12. [2] 齐庆新,窦林名.冲击地压理论与技术[M].徐州:中国矿业大学出版社,2008. [3] 章梦涛,徐曾和,潘一山.冲击地压和突出的统一失稳理论[J].煤炭学报,1991(4):48-53. [4] 邹德蕴,刘先贵.冲击地压和突出的统一预测及防治技术[J].矿业研究与开发,2002,22(1):16-19. [5] 齐庆新,史元伟,刘天泉.冲击地压粘滑失稳机理的实验研究[J].煤炭学报,1997,22(2):144-148. [6] 王振,胡千庭,尹光志.瓦斯压力对煤体冲击指标影响的实验研究[J].中国矿业大学学报,2010,39(4):516-519. [7] 卢平,沈兆武,朱贵旺,等.含瓦斯煤的有效应力与力学变形破坏特性[J].中国科学技术大学学报,2001,31(6): 686-693. [8] 唐春安. 岩石破裂过程数值试验[M].北京:科学技术出版社,2003:1-9. [9] 唐春安. 岩石破裂全过程分析软件系统RFPA2D[J].岩石力学与工程学报,1997,16(5):507-508.
计量
- 文章访问数: 624
- HTML全文浏览量: 0
- PDF下载量: 0