Research on the Stability Mechanism of the Surrounding Rock of Gob-Side Entry Retaining by Roof Cutting in Dianping Coal Mine

According to the movement characteristics of surrounding rock gob-side entry retaining by roof cutting (GERRC), structural evolution mechanism and stability control countermeasures are studied in this paper. Taking bulking as core point, process GERRC is divided into five stages: cutting, dynamic pressure support, gangue bulking, double arch roadway formation. Combined with mechanical analysis, model short-arm beam formed calculated, breaking criterion obtained, which provides a basis for design reasonable support strength calculation. A double-arch protection under action hydrostatic was established, formation studied. The solid coal seam forms immediate balance arch, goaf, articulated transfer beam, main arch. two together called With double-balanced on overlying strata, below located low-stress zone, ensures rock. Through analysis field observation, law deformation above analyzed, reasonableness guard lane verified through numerical simulation cut top lanes. using simulation. In paper, has been developed that allows us understand stress from perspective helping specify efficient countermeasures.