Stability and Cementation of the Surrounding Rock in Roof-Cutting and Pressure-Relief Entry under Mining Influence

The application of roof-cutting and pressure-relief gob-side entry retention plays a critical role in controlling the stability surrounding rock at entry, easing continuity tension improving resource recovery ratio. excavation 360,803 airway Xinji No. 1 Mine is affected by intense mining 360,805 working face. Hence, to address problem airway, mass blast weakening theory was used this study analyze blasting stress columnar charged obtain radiuses crushed, fractured, vibration zones under uncoupled charging conditions. reasonable array pitch, length, dip angle boreholes were determined according range fracture. migration laws roof strata explored based on mechanical model overlying structure Subsequently, horizon, breaking span, caving sequence hard obtained determine height entry. On basis key stratum, number sequences limit stratum hanging length goaf calculated, analytical solution coal pillar width acquired, evaluation indexes for entry-protecting pillars determined, engineering requirements 25 m met. Moreover, various such as separation fracture, displacement rock, loose circle analyzed. cementation status evaluated, tunneling safety ensured.