Study on Rock and Surface Subsidence Laws of Super-High Water Material Backfilling and Mining Technology: A Case Study in Hengjian Coal Mine

Research on the rock and surface subsidence laws of super-high water material backfilling mining technology can provide a scientific basis for liberating coal resources that are deposited under buildings, railways, bodies water. Using field measurements, numerical simulations, theoretical analyses to study geological conditions Hengjian Mine in Handan, Hebei Province, this research comprehensively analyzes dynamic static deformation subsidence, reveals control mechanism, complements existing studies helps improve feasibility new engineering practices. This shows values smaller when used, movement parameters than those fully caving method. The supports load above area suppresses subsidence. In addition, limits height developing stress arch area, thus reducing range movement. practice, development be controlled by increasing rate strength material. With above-mentioned discoveries, is great significance promotion application liberation resources.