Research on the Technology of Deep Hole Blasting Roof Breaking Pressure Relief and Roadway Protection in Transportation Grooves
In view of the problems of large deformation and difficult maintenance of the roadway surrounding rock of the 93lower11-2 transportation groove in Jining No.2 Coal Mine under the influence of mining,combined with the technology principle and theoretical calculation of deep hole blasting roof cutting pressure relief,the roof cutting height of 45 m,roof cutting angle of 75°,and drilling layout mode are determined.The on-site industrial tests show that after deep hole blasting roof breaking pressure relief,the deformation of the roof and floor of the roadway is about 80.5 mm,and the displacement amount of the two sides is about 71.8 mm.The deformation of the roadway surrounding rock is significantly reduced,and good results are achieved.
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