Research And Application Ofcorner Coal Mining Plan In No.1 Mine Of NianPanLiang Colliery Of Ordos City

Recycling corner coal can improve resource recovery efficiency to a certain extent,which is of great significance for increasing the efficiency of mining enterprises and extending the service life of mines.At present,the mining methods of the corner coal mainly include the tunneling method,the wall working face mining method,the partial caving coal method,the roadway retaining method,the small working surface method,the undercover method,the tuning method,and the Wanggeweili method.And many other methods.The 3-1 upper coal seam geological structure,stratum and coal seam structure of the Nianpanliang coal mine is simple,the hydrogeological conditions are simple,the stability of the coal seam roof is poor,the mine gas content is low,and it is a low gas mine.The coal seam spontaneous combustion tendency level is Class I.Coal dust is explosive.(1)Through the analysis of the upper coal seam condition of 3-1 in the Nianpanliang coal mine,combined with the characteristics of different corner coal mining methods,the method of using the Wanggeweili coal mining method as the corner coal recovery method for the 3-1 upper coal seam of the Nangpanliang coal mine is determined..(2)Through the calculation of the raw coal price,the cost per ton of coal,the compensation cost and the operating cost,the economic effect of the corner coal recovery,the research shows that the corner coal of the 31103 section of the Nianpanliang coal mine can obtain a profit of 61.92 yuan per ton of raw coal.Therefore,The recovery of corner coal is economically viable.(3)Through the program must be selected,the final mining width is 4.5m,the isolation coal pillar width is 1.0m,and the corner coal mining process,the supporting efficient driving machine length is 11.8m,considering that the equipment operators cannot enter Unsupported goaf,the length of picking is 12 m.(4)Study on the temporary coal pillar size of the corner coal recovery process,and establish a numerical model to simulate the force and displacement of the temporary coal pillars of four sizes from 1.0m to 2.5m.The simulation shows that when the coal pillar is When the size is 1.0m,the compressive stress and shear stress are close to the compressive and shear strength values ??of the coal seam.At this time,the maximum displacement is18 mm,and the coal pillar state can still be stable.Therefore,the temporary coal pillar between the picks is determined.The width is 1.0m.(5)On-site measurement shows that during the period of mining and after the completion of mining,the coal pillars of the roadway maintain elastic stress state and the stability of coal pillars is good.The force of the coal pillar of the roadway is greater than that of the coal pillar of the coal roadway;the coal pillar of the coal roadway is less stressed and evenly distributed,and most of the coal pillars are in elastic support state.Therefore,the recovery plan and the recovery parameters are reasonable,and the recovery process is safe and reliable.