Abstract:
In order to response the problem of surface subsidence seriously impact on the surrounding environment and production activities during the stoping period of the 3
# coal in Yuecheng Coal Mine,and the increasingly obvious phenomena of subsidence during continuous mining of the working face,a combination method of theoretical analysis and numerical simulation is adopted to explore the characteristics and influencing factors of surface subsidence during the continuous stoping process of the 3
# coal working face.The research shows that when stoping reaches a depth of 90 m,the surface begins to occur movement,with a mining advance influence angle of 85° and a maximum subsidence speed of 89 mm/d;As the coal mining working face extends,a large stress arch is formed above the goaf,which increases the stress concentration of the coal bodies on both sides of the goaf;The stoping of the continuous working face significantly increases the surface subsidence amount,especially in areas with thicker loess layers.The central subsidence of the goaf in the first mining face is the largest and gradually decreases towards the surrounding areas;The overlying rock will horizontally move towards the goaf of the first mining face within the range close to the surface,and decreases with increasing depth.Targeted measures for preventing and governing surface subsidence can effectively alleviate surface subsidence,providing theoretical reference for the governance of surface subsidence caused by stoping of the subsequent working faces.