Analysis of roof separation in gob-side entry retaining combined support with bolting wire mesh

Under the support method of combined support with anchor,wire meshes and cable,the roof deformation mode in gob-side entry retaining were divided into three types.The relationship between the roof separation and the roof deformation mode was analyzed.The mechanism of roof separation was discussed and the critical value of roof separation was calculated.The theoretical analysis results were used to the supporting design of 3117 face of Jin'gang Mine,Sichuan Dazhu Coal-electricity Group Corporation that in roadway combined support with anchor,wire meshes and cable was used to control the roof separation and in the roadside of goaf the roof cables were added to roof cutting in time making up for the not high enough strength of common concrete wall in the early.