大倾角长壁采场煤矸互层顶板稳定性研究

Research on the Stability of Coal Gangue Interbedded Roof in Large Inclination Angle Long Wall Stope

针对梨园河矿25213工作面大倾角、煤矸互层顶板赋存不稳定、强度低、易失稳的条件,研究在不同工作面长度和倾角下的运移规律,并分析硬夹矸层、中硬夹矸层及软硬夹矸层在不同厚度下对支承压力产生的影响。通过现场矿压监测发现,煤矸互层顶板下支架工作呈阻力较低、受载不稳定等特点,针对性设计了提高支架工作阻力、带压擦顶移架,浅截取、深保护,跟机插顶等稳定性控制措施,有效提高了各区支架平均工作阻力,减少了煤矸互层顶板架前漏冒次数,漏冒次数减少了约53%,倾倒次数减少了约52%。

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%.