Study on Reasonable Coal Pillar Size Along the Channel of Coal Pillar Recovery Face in Main Roadway of a Mine
Based on the coal pillar recovery face 22405 in a main roadway of a mine as the engineering background,the distribution law of leading abutment pressure caused by mining in the adjacent working face and its influence on the stability of surrounding rock are investigated,the influence of different coal pil-lars on the roadway abutment pressure is analyzed,and the relevant supporting technical parameters under reasonable coal pillar size are determined.The results show that the return air channelling of 22405 working face intersects with 22401,22402,22403 working face,which is susceptible to mining stress.The stop-min-ing line of the working face of 22402 is close,the coal pillar is only 8 m,and the mining stress concentra-tion coefficient at the return air channele is 1.48,so the deformation and damage of the roadway are serious.The distance of stop-mining line in the 22403 working face is far,the coal pillar is 20 m,the mining stress concentration coefficient at the return air channel is 1.44,and the roadway has no obvious deformation and damage.With the increase of the size of the coal pillar in 22401 working face,the mining stress concentra-tion coefficient of 22405 working face first increases and then decreases.It is determined that the combined support method of"anchor-beam-net-cable-jet"is used to support the roadway in the coal pillar affected ar-ea of 22401 working face.The research results provide a reference for the study of reasonable coal pillar size along the channel of coal pillar recovery face in large roadway.
mining stresscoal pillar sizesurrounding rock controlindustrial testnumerical simu-lation
万方数据
维普
