黑岱沟露天煤矿二采区煤层断陷带的存在使抛掷爆破-拉斗铲倒堆工艺无法按正常区域设计与施工，影响原煤生产接续。通过分析断陷带断层对抛掷爆破高台阶稳定性、钻机倾斜穿孔有效深度、抛掷爆破有效抛掷率等方面的影响，确定了断陷带影响范围。按倒堆与采煤工作线推进度一致原则，建立了抛掷爆破台阶高度、原煤厚度与倒堆系统生产能力之间的函数关系，并结合倒堆系统作业能力分析、有效抛掷率与抛掷爆破台阶高度之间的关系曲线方程、煤层厚度变化情况等，初步确定了断陷带影响区域各采掘带抛掷爆破台阶高度，在此基础上，根据穿孔设备纵、横向作业坡度限制对抛掷爆破台阶顶盘面进行调整，优化确定了断陷带影响区域各采掘带合理的抛掷爆破台阶高度。根据不同抛掷爆破台阶高度条件下爆堆曲线拟合结果，对拉斗铲站立水平高度与倒堆系统各环节作业量进行分析，建立了拉斗铲站立水平高度与原煤生产能力、原煤平均厚度之间的函数关系，并根据各采掘带煤层平均厚度、拉斗铲倒堆作业量等，确定了断陷带影响区域各采掘带拉斗铲站立水平高度。根据断陷带区域地质条件变化，优化确定的抛掷爆破-拉斗铲倒堆工艺参数，可指导黑岱沟露天煤矿实现过断陷带期间安全、高效生产，确保原煤生产接续。

The fault subsidence zone of the coal seam in No． 2 mining district of Heidaigou Open-pit Coal Mine makes the overcasting blast-dragline overcasting mining technology system unable to be designed and constructed as the normal area,which affects the continuity of raw coal production. The influence range of the fault subsidence zone is deter- mined by analyzing the influence of faults on the stability of high bench of overcasting blast,the effective depth of in- clined perforation of drilling rig and the effective throwing rate of overcasting blast. According to the principle of the coal mining and casting working benches advancing rate equality,the functional relationship between the heights of overcasting blast bench,the thickness of raw coal and the production capacity of casting mining technology system is established,combining with the analysis of the production capacity of the dragline casting system,the curve equation of the relationship between the effective overcasting rate and the overcasting blast bench height,and the variation of the coal seam thickness,the overcasting blast bench height in the mining panel affected by the fault depression zone is pre- liminarily determined. On this basis,the top surface of the overcasting blast bench is adjusted according to the limita- tion of the longitudinal and transverse gradients of the drilling rig perforation,the overcasting blast bench height of each mining panel in the affected area of fault subsidence zone is determined. According to the fitting results of differ- ent overcasting blast bench blasting heap curves,analyzing the relationship between the height of the dragline standing bench and the production quantity of each part of the casting system,the functional relationship between the standing bench height of dragline and the production capacity of raw coal and the average thickness of raw coal is established. Based on that,according to the average thickness of coal seam in each mining panel and the casting amount of drag- line,the standing bench height of dragline in each mining panel in the affected area of fault subsidence zone is deter- mined. According to the variation of regional geological conditions in the fault-subsidence zone,the optimized parame- ters of overcasting blasting-dragline casting mining technology can guide Heidaigou Open-pit Coal Mine to realize safe and efficient production during the period of over-fault-subsidence zone and ensure the continuity of raw coal produc- tion.