Research on application of prefabricated crack pressure relief and protecting roadway in the roof of dynamic pressure roadway in deep medium and thick coal seam
In response to the problems of damage caused by dynamic pressure in deep medium thick coal seams,the transportation road-way in the No.130203 working face of Zaoquan Coal Mine was taken as the research object,and the control technology of prefabricated crack pressure relief and protection roadway in deep medium thick coal seam dynamic pressure roadway was studied.This article first analyzed the deformation and damage characteristics and causes of the transportation roadway in the No.2 coal seam working face through on-site investigation,including geological conditions,coal mining methods,roadway section shape,support methods,and other factors.On this basis,this article conducts a theoretical analysis of the effect of artificial prefabricated cracks on the pressure relief of the roof,and explores the influence of factors such as crack depth,crack spacing,and crack direction on the pressure relief effect.Through theoretical calculations,reasonable parameters for artificial prefabricated cracks pressure relief on the roof were obtained,and a pressure relief and protection roadway technology for"artificial prefabricated cracks on the side of the roadway"was proposed.Based on this technology,design and practice were carried out.The practical results show that by constructing artificial cracks on the side of the road-way,the surrounding rock pressure is effectively released and the stability of the roadway is improved.
medium thick coal seamprefabricated cracksurrounding rock of roadwaystrong mininghydraulic fracturing
万方数据
维普
