Research on the Stability of Coal Gangue Interbedded Roof in Large Inclination Angle Long Wall Stope
In view of the conditions of high inclination angle,unstable occurrence of coal gangue interbedded roof,low strength,and easy instability in the 25213 working face of Liyuanhe Mine,this paper investigates the migration law under different working face lengths and inclination angles,and analyzes the influence of hard gangue layer,medium hard gangue layer,and soft hard gangue layer on support pressure under different thicknesses.Through on-site mine pressure monitoring,it is found that the support work under the coal gangue interbedded roof has the characteristics of low resistance,unstable loading and so on.Stability control measures such as improving the support work resistance,roof friction and frame displacement with pressure,shallow cutting,deep protection,and machine following and roof inserting,etc,are targeted designed.This effectively improves the average work resistance of the support in each area,reduces the number of leaks in front of the coal gangue interbedded roof frame,reduces the number of leaks by about 53%,and reduces the number of dumping by about 52%.
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