Monitoring and measurement analysis of key indexes for the implementation of mining, dressing, backfilling, and controlling technology in coal resources-A case study of Tangshan Mine

Based on the mining, dressing, backfilling, and X technology framework, we proposed the key operation indexes by exploring the principle, system, and integrated process of "mining, dressing, backfilling, and controlling" technology. After that, the index monitoring method was established to further analyze the change law of key indexes and implementation effects of "mining, dressing, backfilling, and controlling" technology. The mining engineering of Tangshan mine showed that the "mining, dressing, backfilling, and controlling" technology solves the problems of gangue discharge, construction protection, and safe mining of compressed coal resources. The vertical feeding capacities and filling capacities are 337,171 and 422,428 t/year, respectively. The stress change in the filling body is consistent with the dynamic roof subsidence, with a compacting ratio of 81.3%. The average filling mass ratio (1.28) is greater than the design value (1.2). The maximum ground subsidence is 49 mm, and the deformation of the structure is controlled within the range of Level I. The research result provides evidence for the deepening of the theoretical and technical researches of "mining, dressing, backfilling, and X." It also provides a technical reference for mines with similar geological conditions and engineering problems.