Forced Caving with Middle Deep-hole Blasting

The roof is hard in the top No.10 coal seam,in east wing No.3 mining area,in Xin'an Coal Mine,in Shuangyashan Mining Industry Group.It's difficult for roof caving.It's easy to form large overhanging roof.Forced caving with middle deep-hole blasting is applied in this coal mine.The safe production is realized.