Scheme research on weakening bottom bulging of leaving alleys along the goaf with inclined filling bodies
Regarding the phenomenon of bottom bulging caused by leaving alleys along the goaf,a scheme is proposed to weaken the phenomenon by using inclined filling bodies.To verify the feasibility and on-site effect of the scheme,obtaining a reasonable inclination angle of the filling bodies,taking the leaving alleys along the goaf of the Wulanmulun Coal Mine comprehensive mining working face of Guoneng Shendong Coal Group Co.,Ltd.as research background,a theoretical analysis is conducted and to obtain the optional range of inclination angles of the filling bodies along the alley,and by using numerical simulation,further experimental comparison is conducted on the optional angles.The research result are further monitored and verified on site,the stress effect of the filling bodies on the bottom plate gradually weakens with the decrease of the inclination angle of the filling bodies along the alley,but the inclination angle should not be less than 70 °,when the inclination angle of the filling bodies changes from 90 ° to 85 °,the reduction in vertical displacement of the bottom plate and the horizontal displacement of the bottom plate towards the goaf direction are the most significant,that is the effect of weakening the bottom bulging was the best.
leaving alleys along the goafweakening bottom bulginginclined filling bodyscheme research
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