Start-up principium of rock burst in whole coal roadway floor in half-island face

According to the case and theoretical analysis,the concept of rock burst stat-up was brought forward,pointed out that rock burst occurred through three periods named rock burst start-up,energy transfer,rock burst emerged.Put the focus of rock burst prevention forward to the period of rock burst stat-up,a engineering structures model of roadway rock burst was established.The research results show that rock burst stat-up from the floor in whole coal roadway because of the high stress concentration in both side of roadway,and the floor only is the carrier of energy transfer and release,which show the location of rock burst occured.Further put forward the theory of rock burst stat-up,which point out that the intrinsic factor of rock burst stat-up is the excessive accumulation of static load in roadway near-field system,the exterior factor is dynamic load source from outside the system,and the energy criterion of rock burst stat-up is fixed on.Pointed out the possible area of rock burst start-up.