Technical Access to Improve Lump Coal Rate of Drilling and Blasting Coal Mining Face Area

In order to improve the lump coal rate of the drilling and blasting mining face in a small mine, in combination with the lump coal seam features of the sma II mine in Longyan Mining Area, the paper had an analysis that the influence factors of the lump coal rate would be the lithology features of the lump coal and the drillin g and blasting mining method.Based on the lithology features of the lump coal, the lump coal could be divided into three kinds of lump coal.In order to improve the lump coal rate, the three kind lump coal mining could select different coal cutting methods.The trial results showed that the hard lump coal seam with suitable drilling and bla sting cutting method could have a lump coal rate improved by 23%.When there was a joint developed zone in the lump coal seam, the drilling and blasting would not be allowed to be applied and the pneumatic pick could be directly applied to the coal cutting. Thus the lump coal rate could be improved by 33%.When a seam with lump Co al and fine coal, a standing blasting with pneumatic pick coal cutting method could be applied and the lump coal rate could be highly improved.