摘要
大倾角松软煤层综放面实现高产高效的关键之一是端面顶煤稳定性控制。借助数值模拟软件UDEC,模拟了在端面距、支架工作阻力、支架前柱走向倾角、老顶周期来压以及直接顶厚度等影响因素下端面岩体的稳定性。其结果表明,随着端面距的增大,端面顶板冒落高度和煤壁偏帮深度都随之增大;控制顶板冒落高度、支架工作阻力和支架前柱走向倾角都有合适的临界参数;老顶是否周期来压和直接顶厚度对端面围岩顶板的破坏深度有直接影响,继而对这些影响因素进行了量化分析,提出了围岩稳定合理控制参数,减少了采煤工作面冒顶事故和煤炭资源的损失,并对同一条件下的综放开采具有重要的指导意义。
Stability control of the head face＇ s top-coal is one of the key techniques of realizing high production and high efficiency coal mining in fully mechanized top-coal caving face. Using numerical simulation software UDEC, this paper analyses effects of different characteristic factors such as tip to face distance, working resistance of support, stent anterior column trend angle, main roof and immediate roof thickness on the face rock stability. The result shows that as the distance of tip to face increases, the roof falling height and coal wall sloping depth in- crease. For controlling the roof falling height, working resistance of support and stent anterior column trend angle have a suitable critical values. The main roof and the immediate roof thickness have direct effect on roof failure depth. A quantitative analysis of those factors can supply the reasonable stent structure and parameters to reduce the coal face roof fall accidence and the loss of resources, and has important guiding significance for the similar ge- ological conditions of production caving.
出处
《矿冶》
CAS
2014年第3期9-12,37,共5页
Mining And Metallurgy
关键词
大倾角
端面冒顶
数值模拟
large inclined angle
end face roof fall
numerical simulation ： large inclined angle
end face roof fall
numerical simulation
