Weakening Technology of Hard Roof Blasting in Fully Mechanized Mining Face
To solve the problems of large hanging roof area,abnormal mining pressure,and large gas emission in the goaf of the hard roof fully mechanized mining face,taking 3505 fully mechanized mining face as the research object,it was proposed to use blasting weakening technology to treat the roof,and develop a targeted roof blasting weakening scheme based on the on-site situation,and analyze the engineering application effect.Blasting boreholes were arranged between the cutting frames and in the mining roadway of 3505 fully mechanized mining face to weaken the rock strata within 9.6 m of the roof,and specific blasting hole layout parameters and construction schemes were provided.After engineering application,the initial compaction step distance of 3505 fully mechanized mining face was controlled at 18.6-25.6 m,with a relatively low compaction intensity,indicating that the blasting weakening technology used can achieve timely collapse of the goaf roof and create good conditions for mining face safety.
万方数据
维普
