Support technology for small coal pillars driving roadway along goaf
In order to address the difficult support problem of small coal pillars driving roadway along goaf,we take the small coal pillars driving roadway along goaf of the 26mid06 working face in the Dafang Lvting Coal Mine as the engineering back-ground.Through field observations and theoretical analysis,the occurrence of coal seams and the surrounding rock structure are explored,and the causes of deformation and failure of the roadway are identified as low strength and poor integrity of the coal-rock mass,unreasonable support parameters,and dynamic pressure effects.Based on the geological conditions of the 26mid06 working face,optimized support design schemes and reinforcement support designs are proposed and industrially ap-plied on-site.The results of on-site monitoring show that with the implementation of the optimized support design scheme,the maximum convergence of the roof and floor of the roadway is 130 mm,which is about 54％lower than that under the original support scheme.The deformation of the roadway is within a controllable range,indicating the achievement of the expected support effect and verifying the feasibility and effectiveness of the optimized design.
small coal pillardriving roadway along goafgrouting reinforcementsurrounding rock deformationsupport de-sign
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