关中矿区遗留巷道矸石充填减灾关键技术研究OA

Abandoned roadways pose a high risk of spontaneous combustion and explosion under high-temperature and high-gas conditions.Based on the actual geological conditions of the central belt conveyor roadway layer adjustment section,the central No.2 auxiliary transport roadway layer adjustment section,and the surrounding connecting roadways in the Binchang Mengcun Mine,this paper aims to prevent safety problems such as gas disasters and residual coal spontaneous combustion caused by air leakage in roadways.A coordinated system for gangue crushing and pumpable backfilling distribution is established,using solid gangue and fluidized gangue slurry to achieve disaster mitigation through backfilling of abandoned roadways.Fluent numerical simulation shows that at a transport capacity of 40 m3/h,a 125 mm diameter pipeline is selected,and the slurry remains stable during pipeline transport with no obvious stratification.Slurry proportioning experiments determine that a slurry with a concentration of 78%is used as the backfill material.The designed backfilling capacity of the fluidized gangue backfilling system is 36 m3/h,with a gangue backfill rate of approximately 57 t/h.A total of over 10,000 tons of gangue and about 7,540 m3 of backfill slurry have been accumulated,achieving good backfilling results.This technology enables large-scale disposal of coal gangue while sealing abandoned roadways,thereby achieving backfilling and disaster mitigation.