The Stress Evolution of Adjacent Working Faces Passing through an Abandoned Roadway and the Damage Depth of the Floor

An advanced break or a vast region of pressurisation may occur when the working face passes through an abandoned roadway, resulting in roof falling water inrush. The stress evolution passing roadway coal mine was comprehensively discussed using theoretical analysis, numerical simulation, and field monitoring. In this study, calculated critical width where main bound to 5.4 m. Reducing suspended length is beneficial stability face’s passage across roadway. maximum abutment on occurred at semi-abandoned reaching 44.3 MPa. Subsequently, it decreased sharply until completely passed returned normal level. damage depths floor strata from monitoring were 15 20 m, which showed that use hydraulic fracturing technology combined with grouting support for proposed stabilise safe mining.