Principle and methods of identifying favorable mining blocks of coal resources in Hancheng Mining Area

Geological disasters are the main influencing factors of coal mine safety production, which seriously threaten people’s life and property safety. Identification of favorable coal mining blocks and rational division of mining blocks in mining areas have a guiding role in accurate, safe and efficient mining of coal resources. In this paper, the No.3 and No.11 coal seams in Hancheng Mining Area are taken as the research objects, and the thickness of the minable coal seam, the relative complexity of geological structure, the risk of water damage and the risk of gas geological disaster are respectively taken as the first-level evaluation indexes to divide the mining blocks. According to the grades of the four first-level indicators, the graph hierarchy superposition analysis method is adopted to superimpose the graphs of each indicator in turn, and the mining blocks in Hancheng Mining Area is divided into unfavorable mining blocks, reformable mining blocks, more favorable mining blocks and favorable mining blocks. The results show that the No.3 coal seam in the mining area is mainly the reformable blocks and the unfavorable blocks. Considering the influence of roof water on coal mining, No.11 coal seam is mainly more favorable and reformable block, while considering the influence of floor water, it is mainly unfavorable mining block and reformable block. By comparing and analyzing the research results with the actual situation of the mining area, it can be seen that the locations of gas outburst, water inrush and other accidents that have occurred in the area are all located in the comprehensively judged reformable block of comprehensive evaluation, which to some extent reflects that the identification method adopted is feasible and the identification result is credible.