Technology of Hydraulic Cutting Roof and Protecting Roadway in Dynamic Pressure Mining Gateway of Isolated Island Working Face

In order to solve the problem of isolated working face roadway affected by high bearing pressure from non-fully caving roof of adjacent working face mined out area, using hydraulic cutting roof method, pressure propagation route of old roof in mined area is cut off to make the stress of isolated working face roadway reduced greatly and supporting maintenance of extraction roadway easier. Through FLAC numerical simulation software and combined with actual geological and production conditions of 7603 isolated working face of Wuyang Coal Mine, simulation analysis of 7605 working face mining on lateral support pressure formation of 7603 isolated working face transport roadway coal pillar is carried out. Through hydraulic cutting roof, stress monitoring shows that coal pillar stress reduced by 30% on average, which improves the supporting stress environment of 7603 island coal face mining roadway.