Progressive Pressure Relief Technology and Application in the Side of High Stress Coal Roadway with Large Buried Depth
Aiming at the rock burst hazards triggering factors of multiple faults,high stress and other in Tangkou Coal Mine,on the basis of conventional coal body pressure relief technology,segmented hole expansion pressure relief technology,one hole multi-purpose pressure relief technology,and cross face advance pre pressure relief technology for the groove along goaf are proposed,and a progressive pressure relief and hazard relief technology system suitable for high stress roadway side is constructed.The research shows that the segmented hole expansion and pressure relief technology adopts a drilling method of small aperture in the shallow part of the roadway side and large aperture in the deep part,which improves the pressure relief effect in the high stress area of the roadway side and increases the construction efficiency to 1.4 times;One hole multi-purpose pressure relief technology includes shallow hole"drilling+cutting"technology and deep hole"drilling+pressing+injecting"technology,with a total drilling volume of 66%per 100 meters of conventional pressure relief technology;The directional roof breaking-cross face pre pressure relief technology for the groove along goaf effectively reduces the number of pressure relief holes in the next working face groove,achieving the purpose of weakening the roof weighting of the adjacent two working faces and the excavation support pressure of the next working face groove in one go.