煤层倾角对拉斗铲倒堆工艺的影响研究

Effect of Dip Angle of Coal Seam on Dragline Stripping System

为了使拉斗铲能更好地适应煤层倾角的变化,提高拉斗铲工作效率,基于露天采矿基本原理、我国煤层赋存条件以及拉斗铲工况特点,建立了厚覆盖层简单倒堆形式下煤层倾角变化拉斗铲倒堆作业的数学模型,分析了煤层倾角变化对露天煤矿拉斗铲作业效率和抛掷爆破抛掷率的影响,得出了拉斗铲最大倒堆高度、排弃最大距离和有效抛掷率的普遍计算公式以及拉斗铲倒堆作业的限制条件.通过对哈尔乌素露天煤矿使用拉斗铲的实例研究,结果表明:煤层倾角和拉斗铲的最大排弃高度成线性增加,同时,当煤层倾角越大,拉斗铲最大倒堆距离越大,抛掷爆破的有效率越小.

In order to make the dragline adaptable to the variation of dip angle of coal seam,we built a mathematics model for dragline operation in coal seam with changing dip angle and thick overburden based on the basic theory of surface mining and on China's coal hosting condition and draglines' working characteristics.The effect of coal seam dip angle on dragline operation efficiency and on throwing blast ratio are analyzed and the formulas calculating the max stripping height,distance,throwing blast ratio,and the restrictive condition of dragline operation obtained.A cse study was performed in Haerwusu Surface Mining,indicating that the max stripping height of draglines and coal seam dip angle have a linear increase,the steeper the dip angle is,the longer the stripping distance of dragline is,and the smaller the effective throwing blast ratio shall be.