H.B.Chu,W.M.Liang & Y.Q.Yu College of Civil Engineering,Henan Polytechnic University,Jiaozuo,Henan China XL.Yang Luoyang Institute of Science and Technology,Luoyang,Henan China
<正>In order to study the coal blast mechanism further and improve the coal mine gas drainage effect, the author analyzed the process of coal blast damage and failure and selected the damage and failure criterion, and then analyzed the coal mine gas role in the process of coal blast damage and failure.Based on the similarity theory,the author designed the coal blast experiment,while ultrasonic wave velocity and macro-blasting cracks of the test block were measured.The experimental results show that the parameters controlling coal blast damage and failure may include blast wave,detonation gas and coal mine gas,and the coal mine gas has a positive effect in the process of coal blast damage and failure as it can increase the crack tips stress intensity factor Kr.Near the blast area,the blast damage and failure decreased rapidly,but at the moderate or far area,the blast damage and failure decreased slowly,and the blast damage can last a long time at a higher level.
Simulation experiment study on the coal blast damage and failure;length;than;test;
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