上下煤层协同采动对巷道超前补强技术研究OA

To investigate the influence of dynamic pressure generated by coordinated mining of upper and lower coal seams on roadways of lower working faces and advanced reinforcement technologies,No.2 and No.5 coal seams in Jiaojiazhai Mine were taken as the engineering background.A combination of numerical simulation and theoretical calculation was adopted to analyze the disturbance law of the surrounding rock stress field in the lower coal seam induced by upper coal seam mining.An advanced reinforcement support scheme for roadways in the lower coal seam was proposed and optimized.The results showed that the mining of No.2 coal seam formed stress reduction zones and stress elevation zones in No.5 coal seam.The disturbance impact on No.5 coal seam roadways intensified as the mining distance increased.The original support strength was only 1.13 times the rated value.After the design of three reinforcement schemes,the support strength was improved to 1.2～1.4 times the rated value.Among them,Scheme Ⅲ reduced roof displacement by 16.7％～27.7％,which significantly improved the stability of roadway surrounding rock.The research findings provided theoretical and technical references for roadway support in coordinated coal seam mining under similar geological conditions.