Study on non-pillar mining technology of preset packing body and roof cutting in deep well roadway

In the view of present deep-well and high-stress mining environment problem especially in complex and low recovery rate of coal resources,a new technique with preset packing body and roof cutting for coal seam without coal pillar mining is putting forward,with coal mine 21214 head-entry in Shanxi as the research object,through theoretical analysis and numerical simulation method to determine reasonable roof cutting parameters and preset packing body width. The feasibility study was carried out with an industrial test,according to the design of the construction technology and parameters in 21214 coalface. The test results showed that the technique with preset packing body and roof cutting for coal seam without coal pillar mining practice effect was remarkable. The maximum displacement between roof and floor rock of roadway was 120 mm and the displacement of solid coal wall was 145 mm. It also showed that the deformation of roadway surrounding rock can be successfully controlled.