Reasons and Prevention Measures for Rock-burst in Hard Floor of Igneous Rock

Rock-burst disasters are more and more frequently under the influences of complicated geological conditions in recent years.There were several serious floor rock-burst in areas of igneous rock floor in the first working face of Zhaolou coal mine.This paper analyzed the causes of rock-burst induced by igneous rock.The paper pointed out that the high rigidity and the high horizontal stress which cased by hard igneous rock were the main causes of floor rock-burst.The control mechanism and prevention methods were presented.This paper brought forward some specific and customized prevention measures of floor rock-burst on intrusive igneous rock floor in the first working face of Zhaolou coal mine.The site engineering practice gained favorable results.