现阶段近水平复合煤层露天矿端帮靠帮回采建设过程中，仍然存在局限，只是研究了下部煤层的回采，对于高位煤层的回采难度较大，研究较少，因此，为了能在近水平复合煤层中进行高位煤层的回采，本论文通过分析宝日希勒露天矿边坡工程地质情况和地层赋存特点，利用FLAC3D构建端帮三维数值模拟模型，计算了借助内排土场平盘靠帮回采高位煤层1-2煤时换填步距与边坡稳定性的关系，设计确定了靠帮回采高位煤层1-2煤边坡稳定性控制技术及相应的靠帮回采方案。研究结果表明：端帮1-2煤高位煤层靠帮回采换填步距不超过80m，端帮1-2高位煤层靠帮回采时，借助于发展到1-2煤台阶底板上的内排土场平盘布置设备进行靠帮回采，回采方式为分层捣运、内排追踪回填。全区靠帮回采可多回收1-2煤2260万t，取得49.72亿元的经济效益。

At present, there are still some limitations in the process of mining and construction of the end slope of the near-horizontal composite coal seam open-pit mine. Only the mining of the lower coal seam is studied, and the mining of the top coal seam is more difficult and less studied. Therefore, in order to carry out the mining of the top coal seam in the near-horizontal composite coal seam, the author analyzes the engineering geological condi-tions and strata occurrence characteristics of the slope of the Baorixile open-pit mine, and uses FLAC3D to con-struct the three-dimensional numerical simulation model of the end slope, and calculates the relationship between the filling step distance and the slope stability when the top coal seam 1-2 is mined with the help of the inner dump plate. The slope stability control technology and corresponding mining scheme of 1-2 coal seam in top coal seam are determined. The research results show that the replacement step distance of the top-level coal seam in the end-slope 1-2 coal seam is not more than 80 m. When the top-level coal seam in the end-slope 1-2 coal seam is mined, the equipment is arranged on the flat plate of the inner dump developed to the bottom plate of the 1-2 coal seam. The mining method is layered tamping and inner row tracking backfilling. The whole region can recover 1-2 coal 22.6 million t by end slope mining, and obtain income of 4.972 billion yuan.

国家自然科学基金资助项目(51974144);辽宁省“揭榜挂帅”科技攻关专项资助项目(2021JH1/10400011)；辽宁工程技术大学学科创新团队资助项目(LNTU20TD-07)。