Comparative Analysis of the Distribution Characteristics of Floor Stress Field between Gob-Side Entry Retaining with Roof Cutting and Conventional Mining

All coal fields in North China are affected by floor confined water to varying degrees, failure and inrush risk have always been a major problem baffle mining activities. Roof cutting pressure relief the lack of protective pillar can cause change stress field, leading depth, field is key determine depth failure. In order deeply study distribution characteristics gob-side entry retaining with roof cutting, taking 50107 50109 working faces Dongdong Coal Mine Chenghe as research objects, numerical simulation software used simulate conventional mining. The face compared analyzed under three modes reserved pillar, first cutting. results show that peak concentration front all occurs at 10 m modes. area mainly middle face. (50107) located side roadway. (50109) two ends value maximum concentrated > (50109). There reduction zone behind face, but there phenomenon extending outside roadway, obviously different. Conventional double form on rear following order: On close transportation = (50109); return airway,