Abstract:

In Deo Nai surface coal mine, beside many old mining equipment working quite effectively, most of the new equipment have different characteristics and therefore the influence of fragment size distribution on effectiveness of loading, hauling equipment is difference, but this problem is not mentioned about in the calculation of blasting parameters. Until now, there has not been any research on the determination of suitable fragmentation for Deo Nai surface coal mine in a comprehensive, scientific basis and the natural, technical and technological conditions. Therefore, this paper focuses on the necessary and meaningful problem for practical conditions of the mine. The research is approached by analytical and statistical methods combined with computer program, and the least squared method. The result obtained are: the establishment of loading factor depending on rock fragmentation for some modern loading equipment, the law of dependence of fracture on fragmentation determining the suitable fragmentation to ensure the minimal operation cost for the natural, technical - technological conditions of Deo Nai surface coal mine, and from this result, the suitable specific charge and blasting parameters for the mine are determined.