Deformation mechanism and control measures of gravel gang in roof cutting roadway of Shuangliu Coal Mine
By combining theoretical analysis and field engineering application,the deformation mechanism and control technology of the gravel gang in roof cutting roadway were researched with the engineering background of the right one working face of the 7 th coal seam in Shuangliu Coal Mine.The study shows that the gangue collapse on the side of the mining area has a great influence on the deforma-tion of the gangue blocking structure,the collapse of large gangue will produce a strong impact on the blocking gangue,and the slow col-lapse speed will lead to the increase of the lateral pressure on the blocking structure after the compaction and stabilization of the col-lapsed gangue,and the blocking structure is easy to produce large deformation under the lateral impact and extrusion.In order to reduce the size of the gangue blocks,speed up the roof collapse speed,increase the strength of the rubble gang supporting,a combination of deep and shallow hole slitting blasting technology supplemented by loose blasting technology roof cutting program and"diagonal support monolith+retractable U-beam+metal mesh+U-beam tie plate+welded steel plate+end anchor"rubble gang joint support system was proposed and applied to the site.After the field measurement,it shows that the effect of roadway construction is good.
gravel ganggangue supportinggob-side entry retainingslitting and blasting
万方数据
维普
