Research and Application of Technology of Roof Cutting for Small Coal Pillar in 2102 Working Face of Changcun Coal Mine
In response to the problem of large thickness of the No.3 coal seam in Changcun Coal Mine and the loss of a large amount of coal resources by leaving a 30 m section of coal pillars,a method of reducing the size of the coal pillars in the section by cutting the roof and protecting the roadway is proposed.By comprehensively using theoretical calculations and digital simulation methods,a reasonable pre cracking depth of 15 m,an angle of 0 °,and a section coal pillar width of 10 m were determined.Through on-site testing at the 2102 working face,the 2102 track roadway was roof cut and protected.When a 10 m section of coal pillar was left,the deformation of the surrounding rock of the roadway was not significant,and there was no risk of instability of the roof separation layer,which can meet the safety production needs on site.
thick coal seampressure relief by roof cuttingcoal pillarsurrounding rock deformation
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