露天煤矿产能核增影响下采区划分研究

Study on division of mining area under influence of production capacity increasing of open-pit coal mine

提高露天煤矿生产能力,对增加矿山开采经济效益具有直接且显著的意义。以准东某露天煤矿开采现状为基础,针对其生产能力由原20 Mt/a扩增为50 Mt/a的发展目标,研究满足50 Mt/a生产能力的采区发展要求,确定产能核增影响下的最佳采区划分及发展关系。以技术可行性与经济合理性为原则,计算扩增后该露天煤矿的最佳工作线长度为2300~2500 m,并基于所确定最佳工作线长度、该露天煤矿全矿区剥采比等值线图及开采现状提出4种合理的采区划分方案。对比分析了各种采区划分方案优缺点,选取平均工作线长度、二次剥离量、各采区剥采比变化趋势、首采区剥采比、前期外排运距、内排难易程度、采区接续次数、首采区勘探程度及采区接续难易程度等9个指标为采区划分影响评价指标,采用集值迭代法确定采区划分方案影响指标权重,并利用TOPSIS法建立了采区划分方案的综合评价模型。研究结果表明:以当前开采位置为首采区逐渐往西南方向推进4000 m左右,通过90°扇形转向向东推进至东部边界为二采区,然后剩余未开采矿田均分成平行布置的三、四采区。首采区至四采区剥采比分别为1.85、3.04、3.68、5.06 m^(3)/t,剥采比随采区不断往后推进缓步增加,且在这4个采区内剥采比分布较均匀。且该采区划分方案在满足50 Mt/a生产能力条件下,可实现二次剥离量和前期外排运距均较小、接续次数少、首采区勘探程度较高及各采区工作线长度较均匀,对矿山整体发展剥采影响及经济性影响最小。

It is of direct and great significance for increasing the economic benefits of mining by improving the production capacity of open-pit coal mines.Based on the mining status of an open-pit coal mine in Zhundong of Xinjiang,in view of the development goal of expanding its production capacity from 20 Mt/a to 50 Mt/a,the development requirements of the mining areas in line with the 50 Mt/a production capacity well be studied,as well as the optimal mining areas division and development relationship will be determined affected by capacity increase.The technically feasible and economically reasonable working face length of the open-pit coal mine is calculated as 2300~2500 m for the capacity expansion,and according to the optimal working face length and the contour map of the stripping ratio of the whole mining areas,four reasonable mining areas division schemes are proposed.By analyzing and determining the disadvantage and advantage of various mining area division schemes,mine indicators are adopted as impact indicators for evaluating mining areas division,such as the average working face length,the secondary stripping amount,the variation trend of the stripping ratio of each mining area,the stripping ratio of the first mining area,the early external-dumping transportation distance,and the difficult degree of internal-dumping,the numbers of mining areas connection,the exploration degree of the first mining area,and the difficult degree of mining areas connection.While the set-valued iterative method is combined for calculating index weight,a comprehensive evaluation model of the mining area division scheme is developed by adopting the method of TOPSIS.The research results show that the mining area is gradually advanced to the southwest for about 4000 m with the current mining position as the first,and then advances to the east through a 90°fan-shaped turning to the east boundary,which is the second mining area,and then the remaining unexploited mining fields are divided into third and fourth mining areas arranged in parallel Area.The stripping ratios from the first mining area to the fourth mining area are 1.85 m^(3)/t,3.04 m^(3)/t,3.68 m^(3)/t,and 5.06 m^(3)/t,respectively.The stripping ratio gradually increases with the continuous advance of the mining area,and the stripping ratio is evenly distributed in the four mining areas.In addition,the mining area division scheme can achieve small secondary stripping volume and early discharge distance,less connection times,high exploration degree in the first mining area and uniform working line length in each mining area under the condition of meeting the production capacity of 50 Mt/a,and has the minimum impact on the overall development of the mine and the economy.