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Influence of refuse content on economic benefits for fully mechanized top coal caving

机译：垃圾含量对综合机械化顶部煤矿经济效益的影响

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In order to study the influence of refuse content on economic benefits and realize ending drawing top-coal reasonably for fully mechanized top coal caving, relationship between refuse content and drawing interval has been analyzed, and drawing law of loose top-coal with different drawing interval has been simulated by PFC2D software. When refuse content properly increases, drawing ratio will be improved largely if the caved ellipsoid is tangent with one coal-gangue boundary and intersect-ant with another. Drawing ratio of different drawing interval is obviously different when refuse content increases. Besides, with refuse content increasing, the profit increasing rate rises rapidly and then slowly decreases. It also concludes that economic refuse content is 6%-10%. Meanwhile, gangue ratio among coal-gangue flowing slowly increases with refuse content rising and then fluctuates. Finally, gangue ratio tends to periodic changes and also shows signs of increasing. From technological and economic perspective, drawing top-coal should be ended when gangue ratio among coal-gangue flowing is 15%-25% and drawing ratio is about 98%. Then the refuse content will be controlled at 8% and the maximum economic benefits of the mine will be achieved.
机译：为了研究垃圾含量对经济效益的影响，实现完全机械化顶部煤崩位的结尾绘制顶煤，已经分析了垃圾含量与绘图间隔之间的关系，并用不同的绘图间隔绘制了松散的顶部煤炭规律已由PFC2D软件模拟。当垃圾含量适当地增加时，如果塌陷的椭球与一个煤矸石边界与另一个煤矸石边界和交叉蚂蚁相切，则拉伸比率将大大提高。当垃圾含量增加时，不同绘图间隔的拉伸比显然是不同的。此外，随着垃圾内容的增加，利润增加速度迅速上升，然后慢慢减少。它还得出结论，经济垃圾含量为6％-10％。同时，煤矸石之间的膨胀率慢慢增加，垃圾含量上升，然后波动。最后，兆骨比率趋于周期性的变化，并且还显示出增加的迹象。从技术和经济的角度来看，当煤矸石流动的膨胀率为15％-25％时，绘制顶煤应结束。然后，垃圾含量将控制在8％，并且将实现矿井的最大经济效益。

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