Optimization of mining panel width for stripping technology of blast casting-dragline working bench

In the stripping process of blast casting combined with dragline,the dragline working on the top of blast casting muckpile,the mining panel width is the key mining parameter to maintain the blasting area and equipment op- erations. Blast casting effect,dragline operation requirement and transportation system layout for multi-coal seams are important factors affecting the mining panel width. According to the characteristics and cooperation pattern of blast casting and dragline operation,the influence relationships between mining parameters of blast casting and dragline op- erating parameters were analyzed. The high-width ratio of working bench and row effects of blast hole,closely related to effective casting ratio,were analyzed. By taking the minimum composite cost of casting blast with dragline stripping op- eration as the goal,as well as dragline operation requirement and transportation system layout as constraints,the non- linear mathematical programming model for optimizing mining panel width of blast casting bench was established. The calculation result for Heidaigou surface coal mine shows that the optimum mining panel width is 67 m for blast casting working bench.