Mechanism and control measures of rockburst in Huating Coal Mine

In order to understand the mechanism and prevention of rockburst in Huating mine,the rupture mechanism of rockburst was inversed,using focal mechanism solution method. Combining with in-situ stress measurement,micro- seismic monitoring,field investigation,mining analysis and theoretical analysis,the focal mechanism solution method was proved to be reliable,and the appropriate control strategies would be made after analyzing the causes of rockburst. It was concluded that the focal mechanism solution method was effective for mining rupture mechanism inversion. The frequent rockburst in Huating mine was mainly caused by great horizontal stress,the large angle of intersection between maximum principal stress direction and roadway trend,the large unsupported roof of thick sandstone,and the large thickness and strong burst trend of bottom coal. There were severalways to prevent mine rockburst. During coal face de- sign,it should be avoided that the maximum principal stress direction intersected roadway trend with a big angle. Min- ing lower slice with good impact resistance,relieved vertical mining stress by roof presplitting,roadway drilling and cutting off the floor,were also the major solutions for the prevention of rockburst.