Research on rock burst prevention of high static coal seam in hard roof working face

In order to study the main control factors and prevention techniques of rock burst in hard roof fully mechanized top coal caving mining face,microseismic monitoring system and rock burst monitoring system were used to study the main controlling factors of rock burst in the working face.The results show that the main factors of rock burst are high static load,strong mine shock and low support strength.The static load of the solid coal is 30.16～84.48 MPa and the static load of the coal pillar is 27.84～41.04 MPa,which is easy to reach the critical stress of rock burst.Events with high energy often occur before and after the roof break,and the stress concentration of the coal body is intensified by the dynamic load.Many factors made the supporting strength of roadway bump area relatively low.The field control practice was carried out,multiple stages of the coal seam blasting released stress,the roof was subjected to deep-hole pre-splitting blasting and the anchor cable beam was used to strengthen the support.When large energy mine earthquake happened,the roadway bump resistance ability was improved.The frequency and intensity of deformation induced by mine earthquakes were greatly reduced.