露天煤矿倒堆条件下底部薄煤层柱式回采工艺研究

Study on pillar mining technique for bottom thin coal seam in surface coal mine adopting stripping technology

为了解决抛掷爆破-拉斗铲倒堆工艺条件下底部薄煤层的回采难题,根据倒堆工艺作业特征提出了露天薄煤层柱式回采工艺。推导出了薄煤层开采剥采比的计算公式,确定了适宜回采薄煤层的岩煤高度比,分析了露天薄煤层柱式回采工艺对工作线长度的要求。通过对黑岱沟露天煤矿9#煤回采参数的分析及现场应用,得出:在工作线长度为2 200 m时,每条采掘带可回收煤炭资源37.2万t,获得直接经济效益6 128万元;同时,对露天矿生产能力影响较大,如要兼顾生产能力要求和9#煤的资源回收,需在6#煤采至端帮时适当舍弃部分9#煤。

In order to solve the problem of excavating thin coal seam beneath under the condition of casting blast and dragline stripping technology at the bottom of the surface coal mine, the surface pillar mining has been proposed according to working features of stripping technology. The stripping ratio formula of thin coal seam has been deduced, and the optimum ratio of rock height to coal height has been determined, the requirement to work line of the surface pillar mining has been analyzed as well. After analyzing excavating parameters of the pillar mining technology and its application in the 9th coal seam of Heidaigou surface coal mine, the results show that more than 372 thousand tons can be excavated during the working line is 2 200 m, and it can bring 61.28 million RMB. Meanwhile, the approach has a great influence on capacity, and part-length of 9^th working line should be discarded when the 6thcoal is extracted to the end-slope with considering production capacity requirement and the 9th coal resource recovery.