Cao Bo, Guo Xiaobing, Duan Jianming, Zhang Zuohong, Wu Guixue, Dong Kewen, Yin Yueqi
College of Mining and Engineering, Liaoning Technical University, Fuxin, 123000, China.
Inner Mongolia Coal Mine Design and Research Institute Co., Ltd., Hohhot, 010000, China.
Sci Rep. 2024 Oct 29;14(1):25958. doi: 10.1038/s41598-024-76960-3.
In the production and construction process of a slowly inclined composite coal seam surface mine in China, the problem of coal compression by the non-working slope is common, but the research on coal recovery is usually conducted for the end slope compression problem. Due to the small economic and reasonable stripping ratio in the early stage of infrastructure construction in an open-pit mine, the buried deep coal seam has not yet been mined and is covered by internal dumping. In recent years, with the gradual increase of the economic and reasonable stripping ratio, the mining of coal seam covered by internal dumping site has become feasible. This paper puts forward the mining scheme for this problem. In this paper, a mathematical model is established, and the trench between the inner dump and the non-working side is used as the working platform for coal seam mining. The relationship between stripping height, working line length and mining width of coal seam is studied. The variation law of production stripping ratio, remining amount, repeated stripping amount and mining width is further analyzed. At the same time, the influence of production stripping cost on the economic and reasonable stripping ratio is studied, and the relationship between transportation cost and discharge distance is established, so as to indirectly determine the relationship between mining width and economic and reasonable stripping ratio. Finally, it is found that the relationship between mining net income and mining width is first proportional and then inversely proportional. Taking an open-pit mine as an example, through the quantitative analysis of economic indicators, the net income of coal mining under different mining widths is calculated. The results show that when the mining width is 271 m, the economic benefit of the inner row mining is the highest, and the net income reaches 2021.4575 million yuan. At this time, the production stripping ratio is 5.25, which is less than the economic and reasonable stripping ratio of 6.95. The practical significance of the results is to improve the overall economic benefits and recovery rate of mining enterprises, and ensure the safe, green and efficient mining of mines.
在中国某缓倾斜复合煤层露天矿的生产建设过程中，非工作帮压煤问题较为常见，但煤回收研究通常针对端帮压煤问题开展。由于露天矿基建初期经济合理剥采比小，深部煤层尚未开采且被内排土场覆盖。近年来，随着经济合理剥采比逐渐增大，内排土场覆盖煤层的开采成为可能。本文针对该问题提出了开采方案。文中建立了数学模型，以内排土场与非工作帮之间的沟谷作为煤层开采的工作平台，研究了煤层的剥采高度、工作线长度与开采宽度之间的关系，进一步分析了生产剥采比、复采量、重复剥采量和开采宽度的变化规律。同时，研究了生产剥采成本对经济合理剥采比的影响，建立了运输成本与排弃距离的关系，从而间接确定开采宽度与经济合理剥采比的关系。最终发现开采净收益与开采宽度的关系是先成正比后成反比。以某露天矿为例，通过对经济指标的定量分析，计算了不同开采宽度下的煤炭开采净收益。结果表明，当开采宽度为271 m时，内排开采的经济效益最高，净收益达到202145.75万元。此时生产剥采比为5.25，小于经济合理剥采比6.95。研究结果的实际意义在于提高矿山企业的整体经济效益和回收率，保障矿山安全、绿色、高效开采。
