Surrounding Rock Deformation Monitoring and Control at Oblique Cut Short Wall Working

To solve the hidden trouble in roof oblique segmentation section of short wall mining face, through theoretical analysis, numerical simulation and field surrounding rock deformation monitoring and roof pre-splitting blasting, we study steep medium thickness A3 coal seam,and the results show that: the longer the length of the hanging arch, the greater the safety hidden danger of short wall working face; high stress of cavern roof, the large displacement change are mainly concentrated in the range of 70 m to 120 m from the cut-hole, and the results are verified by stress on-line monitoring; for oblique segmentation working face,we propose roof pre-splitting blasting scheme; we propose corresponding roof pre-splitting blasting, and contrast surrounding rock deformation before and after the implementation of roof pre-splitting blasting, and verify the roof blasting effect.