摘要
为了保持大倾角走向长壁综放面支护系统的稳定性和提高顶煤回收率,运用UDEC2D程序和现场观测法,对顶煤破碎及运移进行了研究。结果表明,工作面中上部煤岩破坏范围大,破碎严重,始动点远;煤壁前方的顶煤运动是沿走向的水平位移和垂直位移矢量合成的复合运动,支架上部是沿走向水平、倾向水平、垂直三个矢量合成的复合位移。在生产中要加强工作面中上部液压支架防倒、防滑措施;在工作面下端要加强放煤,提高顶煤回收率。
In order to keep the stability of the support system in the fully mechanized top coal caving mining face in the steep inclined and strike seam and to improve the top coal recovery rate, the UDEC^2D program and site observation and measurement method were applied to the research on the top coal cracking and migration. The results showed that the coal and rock in the top and meddle section of the coal mining face were failed in a large area, seriously cracking, far to the initial start area. The top coal movement at the front of the coal wall were a complex movement with the horizontal displacement and vertical displacement along the strike of the seam. Above the hydraulic powered supports, the movement was the complex displacement with the horizontal along strike, inclined level and vertical level. In the production, the measures to prevent the falling and sliding of the hydraulic powered supports in the top and middle section of the coal mining face shall be enhanced and the downward section of the coal mining face, the top coal caving operation shall be enhanced. The top coal recovery rate shall be improved.
出处
《煤炭工程》
北大核心
2009年第4期68-71,共4页
Coal Engineering
基金
教育部新世纪优秀人才支持计划资助项目(CEF-04-0972)
关键词
大倾角煤层
长壁综放面
顶煤运移
数值计算
现场观测
steep inclined seam
fully mechanized top coal caving mining face
top coal migration
numerical calculation
site observation and measurement
