关键词:

露天煤矿 , 端帮压煤 , 边坡稳定 , 角度优化 , 陡帮开采

Abstract: In response to the current mining situation of the Hongshaquan open-pit coal mine, it was found that the angle of the end slope is generally lower than the design requirements, which makes it difficult to effectively exploit the overlying coal resources and leads to the waste of coal resources. This study used the Morgenstern-Price limit equilibrium method and finite element strength reduction method to analyze the ultimate angle and sliding mode of the western slope, and verified the feasibility of improving the end slope angle through steep slope mining; Based on the three-dimensional numerical simulation of the mining site, explore the influence of different tracking distances and working slope angles on the stability and deformation of the end slope under the influence of the internal dumping site and working slope; Based on comprehensive engineering conditions, two end slope and steep slope mining schemes were analyzed and compared. The results show that the maximum angle of the western slope can be set at 36°, which is suitable for implementing steep slope mining to optimize the angle of the end slope; Under the influence of the internal dumping site and the working slope, the tracking distance has a significant impact on the deformation and stability of the slope. As the tracking distance increases, the deformation amount and range of the deep rock mass gradually increase, but the gradient of change is small; The change in working angle has a relatively small impact on the stability of the end slope. As the working angle of the slope increases, the exposed area of the end slope surface decreases, and the stability of the end slope increases; Considering the impact of the crushing station on the western slope, a combination of reducing the width of the flat plate and merging steps was adopted to determine the steep slope mining plan. After optimization, the overall angle of the western slope was 18°, with an average annual increase of 800000 tons of raw coal recovery, a stripping ratio of 1.5 m3/t, and an economic benefit of 96.7 million yuan.