Research on self-forming roadway technology by roof cuttting and pressure relief from dense holes in thin coal seam
In order to completely get rid of the dependence on pyrotechnics of roof cuttting blasting along the gob-side entry retaining,and to solve the soft lithology of sandy mudstone on the roof of the thin coal seam,a dense roof cutting hole scheme was implemented to cut the roof and relieve pressure along the old mountain side of the roadway.During the retaining of the roadway,the subsidence of the roof reached within 20 cm,replacing the pre splitting blasting technique.Through research,it showed that dense hole top roof cuttting and pressure relief effectively destroyed the integrity and stability of the rock formation,blocked the transmission of stress from the goaf to the roof of the roadway,and effectively verified the support effect of short-arm beams.
thin coal seamdense holesroof cuttting and pressure relief
万方数据
维普
