Stress Distribution Law and Pressure Relief Technology of Excavation Roadway in Fold Shape Coal Seam

To solve the deformation and poor formation problem of excavating section roadway at 2301 working face of part return air roadway, based on field geological conditions, this paper analyzed the causes of the high stress area, and set up the 3D mechanical structure model of coal seam, carry out the corresponding numerical simulation for return air roadway excavating stress field and displacement field and implement large diameter borehole pressure relief. The results show that the back fold structure of 2301 return airway mining coal seam is the main factor leading to stress concentration; the average stress of fold zone in thick seam is larger than that in thin zone; the stress in roof and coal seam in thick seam fold zone is high and the displacement is big. The implement of borehole pressure relief with large diameter in thick coal fold return airway of 2301 working face solves the deformation of roadway.