Study For GUANDi No.3 Coal Seam Of The Section Coal Pillar Of Reasonsable Retainment

At present,protected by pillar mining roadway still is our country many coal mine adopts the method of the main roadway protection,most foreign countries also is such.Leave districts period of coal pillar for the stability of the roadway and the recovery rate of resources have played a key role,therefore solve the problem of good this section pillar is of great significance.Based on Guan di mining geological conditions in the working face 13510 as the background,carried out the theoretical analysis and calculation for the width of section coal pillar;Studied by similar material simulation experiment,under the condition of different coal pillar width and coal pillar body stress distribution and load capacity;Create FLAC3 D numerical simulation calculation,different arrangement of section roadways and different width of coal pillars are numerically simulated calculation,on the basis of the above research,the study on field test and in 13510 working face.To obtain the following main conclusions:(1)Section pillar of this 13510 face the stress and deformation monitoring,the internal stress and deformation of the coal pillar is evolution.(2)Through research,it is concluded that Guan di mining no.3 coal seam section of single lane roadway arrangement,8~11m of width of coal pillar is advisable,double lane arrangement,20~24m of width of coal pillar is advisable.And no.3 coal seam section of roadway to adopt single lane as soon as possible arrangement.(3)In the process of extraction,to roadway surrounding rock deformation monitoring,draw a convergence of the roadway width to 229 mm,roof subsidence for44 mm,roadway and coal pillar stability is good,which indicated supporting method and parameters and coal pillar width is reasonable.