Study On Mining Roadway Arrangement And Its Support Parameters In The Lower Coal Seam Of Fengjiata Mine

Fengjiata mine is shallow buried coal seam,main mining coal seam is 2#,4# coal,small spacing.In the process of coal seam mining,there is a series of safety problems,such as severe mining pressure,large deformation of tunnel support and roof management.Study on the reasonable position and supporting technology of mining roadway and the coal pillar in the near distance coal seam group,it is significant to improve the stress condition of the coal tunnel in the lower coal seam,improve the reinforcement effect,reducing roadway deformation.This paper with the aim of the Fengjiata mine the lower coal mining efficiency,analyzing Fengjiata coal mine 4# coal mining tunnel layout,coal pillar and tunnel supporting method by theoretical analysis,mining pressure observation and numerical simulation method;4# coal roadway roof loose circle around 2m in general,the roadway left wall surrounding rock loose circle is larger than the right,loose circle will further increase after the basic roof falling,the roadway right wall surrounding rock loose circle is larger than the left,designing the reasonable width of coal pillars in coal seam 4# is 20 m,reasonable stagger distance of upper and lower coal seams is 8~15m,combined support of anchor and bolt used in the 4# coal seam mining roadway,roof anchor specification is ?15.24 × 8000 mm,row & line is1800×3000mm,bolt specification is ?20 × 2000 mm,row & line is 900×1000mm,the wall of roadway bolt specification is ?20×2000mm,row & line is 900×1000mm.The combination supporting scheme is putting forward.Fengjiata coal mine 1404 working face test results in situ surface show that the supporting design can effectively improve the stress level of surrounding rock mass,mining roadway surface displacement is significantly controlled,tunnel supporting effect is better,providing a reference for the popularization of the technology under similar conditions.