Research and Application on the Width of Coal Pillars Reserved for Gob-Side Driving Roadway in Thick Coal Seams
In order to ensure the stability of coal pillars and roadway,and to avoid the waste of coal resources,it is necessary to determine a reasonable width of sectional coal pillars in the thick coal seam working face.Research on the technology of small coal pillars for gob-side driving roadway was carried out in 2202 roadway of Xiaoyu Coal Mine.Through a combination of theoretical calculation,numerical simulation,and field monitoring,the reasonable width of coal pillars in the thick coal seam working face was determined to be 7.8 m.Monitoring and analysis were conducted on the deformation of the roadway surrounding rocks during the excavation and mining period.The results show that during the excavation period,the maximum displacement of the two sides of the roadway is 73 mm,and the maximum displacement of roof and floor is 62 mm.During the mining period,the maximum displacement of the two sides of the roadway is 805 mm,and the maximum displacement of the roof and floor is 604 mm.The deformation of the roadway surrounding rock has been effectively controlled and the roadway is in a stress reduction zone.The research conclusion can provide a reference for the determination of coal pillar width using gob-side driving roadway technology in similar mining working faces.
Section coal pillarCoal pillar widthGob-side driving roadwaySurrounding rock stabilityRoadway deformation
万方数据
维普
