基于陡帮开采的露天煤矿减损开采技术OA

Land occupation and destruction caused by mining disturance in open-pit coal mines have imposed mounting chanllenges on the already-vulnerable mining area ecosystem,the research on re-duced-loss mining in arid open-pit coal mines is an inevitable requirement for the green development of China's coal industry.Based on the connotation of steep-side mining and the goal of land-saving and loss reduction,the characteristics of the disturbance influence caused by open-pit mining were elabora-ted,and the relationship between the slope angle of the mining area and the land destruction area was explored.For steep-side mining,a theoretical model of reduced-loss mining technology was established.Taking the Hongshaquan Open-Pit Coal Mine as the background,specific working slope combination steps and angle optimization measures were proposed,through optimizing the parameters of the end slope using reduced-loss mining technology,with the relationship between reduced-loss mining technol-ogy and land saving analyzed.The results show that the slope angle of the working slope and the end slope angle have a negative correlation with the land destruction area.The land destruction area decrea-ses as the slope angle increases and increases as the working line length increases.Under the reduced-loss mining scheme of the west end slope,the slope angle is increased from 23° to 36°,resulting in an annual increase of 4.5 × 105 m3 of internal discharge space and a reduction of 1 182.7 m2 of the occu-pied area of the dumping site per year.The optimal slope angle of the working slope after optimization should be 13°,and the reduced land destruction area can be 6.8 × 105 m2.The combination of end slope reduced-loss mining technology and working slope reduced-loss mining technology could achieve the goal of reducing land destruction and ecological damage at the mining source.