Research and Application of Key Parameters of Entry Formed by Roof-Cutting in Inclined Coal Seam

The dynamic and complex stress concentration phenomenon during overburden structure stabilization after inclined coal seam mining significantly affects the surrounding rock stability of gob-side entries. To advance the application of entry formed by roof-cutting (EFR) technology in non-pillar mining, this study systematically investigates the optimal parameter selection for EFR in inclined coal seams. The research methodology includes selecting representative test mines under typical geological conditions and employing theoretical analysis, numerical simulation, and field experiments. First, according to the characteristics of EFR forming process, the design criteria of key parameters are given. Then, based on the swelling characteristics of collapsed rock and sliding instability conditions of overlying strata, theoretical formulas for roof-cutting height and angle are derived. Finally, a mechanical model of the inclined seam roof structure is established to analyze and determine roof and lateral support resistance, with corresponding support parameters proposed and validated through industrial tests. Results demonstrate that scientifically designed roof-cutting parameters, combined with the high pretightening force and constant resistance support of constant resistance and large deformation anchor cables (CRLDA), effectively maintain entry roof stability. Furthermore, two-way energy-gathering blasting technology successfully controls working face pressure, while the EFR gangue retention and temporary support system ensures proper entry formation. These findings confirm the feasibility of implementing EFR-based pillarless mining in inclined coal seams, offering significant theoretical and practical value for China’s safe and efficient mining operations.