Method for carrying out comprehensive mechanical coal mining and continuous propulsion mining on split and merged coal beds

Abstract

The invention relates to a method for carrying out comprehensive mechanical coal mining and continuous propulsion mining on split and merged coal beds, which is characterized by dividing the whole mining process of the split and merged coal beds into two stages: an actual mining stage of layered coal beds above a split area and an actual mining stage for carrying out continuous propulsion mining on thick coal beds at a merged area and layered coal beds below the split area. A medium thick coal bed hydraulic supportis used for carrying out actual mining on the layered coal beds above the splitarea, and a grand mining high hydraulic support is used for carrying out actual mining on the thick coal beds at the merged area and the layered coal beds below the split area; open-off cut is conducted only once around a split line and a merged line; the mining height of the hydraulic support is required to be both lowered and raised to carry out 'height-differing mining' to realize the comprehensive mechanical coal mining and continuous propulsion mining on coal beds of different thicknesses. By utilizing he method provided by the invention, the number of open-off cuts, finishing cuts and working surfaces for mining the coal beds under such geological conditions can be effectively reduced, the number of standby collar pillars is greatly reduced, the recovery ratio is improved, and benefits of mining the split and merged coal beds are remarkably improved, thus the method provided by the invention has significance in widespread promotion.

Description

technical field [0001] The invention relates to a coal seam fully-mechanized mining method for continuously propelling mining, which is especially suitable for mining coal seams with complex geological occurrences where coal mines are bifurcated and merged. Background technique [0002] In Huaibei of Anhui, Yanzhou of Shandong, Xuzhou of Jiangsu and other mining areas, the burial conditions of coal seams are complex, and the occurrences are mostly in a bifurcated and merged state. The general trend is that both ends merge and the middle bifurcates. There are hundreds of millions of tons of coal seams with such geological conditions in these mining areas, and the safe and efficient mining of such coal seams is of great significance. [0003] Existing technologies for bifurcating and merging coal seams with geological conditions are: stage-by-stage mining method and top-coal caving mining method. Adopting the staged recovery method not only has complex roadway layout, many co...

AI Technical Summary

Problems solved by technology

Adopting the staged recovery method not only has complex roadway layout, many coal pillars left, low recovery rate, and low yield per unit area of ​​the working face, but also increases the number of relocations at the working face and increases the production cost per ton of coal; Low recovery rate, large amount of mixed gangue, high ash content, easy floating coal and other problems, which are not conducive to coal quality management, gas and mine fire prevention and control, etc.

like figure 1 As shown, the bifurcation line is L, and the merging line is L′. When using the existing technology to recover in stages, it is necessary to leave a coal pillar 3, that is, the layered cutout 7 in the bifurcation section area and the thick coal seam recovery in the merging area. Coal pillars 3 should be reserved for 20-30m between eye 2 and thick coal seam cut eye 1 in the merging area and the lower stratification closing eye 6 in the bifurcation area, which caused a serious waste of coal resources and greatly reduced The recovery rate of the coal seam is determined; the recovery system is divided into merged areas with thick coal seams d 1 Mining stage I, thick coal seam in merged area d 2 The recovery stage III, the recovery stage II of the upper layered coal seam in the bifurcation area, and the recovery stage IV of the lower layered coal seam in the bifurcation area, each stage is arranged with independent cutting holes and closing holes (thick coal seam cutting hole 1 in the merged area, The thick coal seam in the merged area is collected as hole 2, the upper layered coal seam in the bifurcation area is cut into hole 4, the upper layered coal seam in the bifurcated area is collected as hole 5, the lower layered coal seam in the bifurcated area is cut into hole 6, and the lower layered coal seam in the bifurcated area is divided into The seam coal seam is closed as an eye 7), and there are 4 times when the working face equipment is moved and reversed

Therefore, there are problems such as low recovery rate, complex mining system and high production cost in the mining of bifurcated and merged coal seams in the existing technology, which greatly limits the safe and efficient mining of bifurcated and merged coal seams.

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