Prevention and Control Effect of Rockburst in Superhigh-Water Backfilling Mining under Deep Coal Seam

Abstract

Safe, efficient, and green mining of deep coal seams is a major problem to ensure the healthy development of China's national modern energy economy. To explore the prevention and control effect of superhigh-water backfilling mining on rockburst, taking CG1302 working face of Shandong Yineng coal mine as the engineering background, it is explored through theoretical analysis, numerical simulation, and field monitoring. It is concluded that mining depth, mechanical properties of coal and rock mass, overburden conditions, geological structure, and roadway layout of the working face are the main influencing factors to induce rockburst, and it is determined that the Yineng coal mine has the conditions for rockburst. Based on the energy theory, the distribution law of coal deformation energy is analyzed, and the minimum kinetic energy of rockburst is calculated as Emin = 77 kJ/m3. The energy accumulation in coal seams under different backfilling rates is simulated. Compared with caving mining, superhigh-water backfilling mining can effectively reduce the energy accumulation degree of coal seams and prevent the occurrence of impact dynamic disasters. Field microseismic and coal body stress monitoring results show that superhighwater backfilling mining can effectively reduce the working face pressure and achieve the effect of preventing rockburst.