Study on Overburden Stability and Development Height of Water Flowing Fractured Zone in Roadway Mining with Cemented Backfill

In order to explore the stability of overburden rock and development height water flowing fractured zone in roadway filling mining, based on movement deformation mechanism rock, mechanical analysis failure was carried out, model main roof beam established, ultimate span limit deflection fracture were deduced. Combined with basis for judgment developing is given this paper. Taking a coal mine backfill under water-bearing stratum as an example, equivalent mining height, theoretical calculation are out zone. The reliability verified compared empirical formula numerical simulation results. results showed that developed bottom no. 7 glutenite, 32.5 m, slightly less than result formula. thickness waterproof pillar 39.8 which much distance from aquifer seam can be mined safely.