倾斜煤层窄长露天矿分区开采分期境界优化

针对倾斜煤层窄长露天矿,经常采用纵采转横采内排的开采程序,基于其剥离物流向流量的变化对经济合理剥采比大小的影响,提出一种分区、分时期的优化开采境界方法。该方法依据首采区位置的不同可分为A模式(即首采区位于矿权一侧)和B模式(即首采区位于矿权中部)两种开采模式。此外,按照露天剥采工程发展过程中剥离物流向流量变化的情况,将其露天矿山开采过程归结为三个时期:全部外排期、部分内排期和全部内排期。通过构建剥、采、排工程位置模型,系统地研究了两种开采模式分时期境界优化的原则和适用条件,并提出境界优化模型。研究成果在准东露天煤矿开采实践中得到应用,结果表明:准东露天矿的经济合理剥采与其开采境界优化前相比,由原来的1.50m~3/t增加至1.62m~3/t,其经济合理开采深度增加了24.7m,顶帮外扩距离增加了45.65m,经济可采储量增加了85.27Mt。实现了露天开采经济效益的最大化。

Block system optimization by stages for inclined seam long narrow open-pit mine

In the narrow and long open-pit mine of inclined coal seam, the mining procedure of vertical mining and horizontal mining are often adopted. In view of the influence of the change of the distribution of logistics on the economic reasonable stripping ratio, the block system optimization by stages was proposed, which involved two patterns, namely A pattern (the first mining area was located in the right side of the mining right) and B pattern (the first mining area was located in the middle of the mining right). In addition, the process of mining was divided into three periods according to the change of the separation of logistics to the flow:all external drainage, partial internal drainage and total internal drainage. By constructing the location model of stripping, mining and drainage, the paper systematically studied the principle and the conditions applicable to the state optimization of two mining modes, and put forward the model of state optimization. The research was applied in the practice of the Zhundong surface coal mining and the results show that the economic stripping ratio has increased from 1.50 m³/t to 1.62 m³/t, the economic mining depth by 24.7 m, the overtopping distance by 45.65 m and the economically recoverable reserves by 85.27 Mt, realizing the economic interest maximization of open-pit mining.