Prevention theory and technology of rock burst with distinguish dynamic and static load sources in deep mine roadway

In this paper,the research on the structural characteristics of overburden in deep mining is extended to the prevention and control technology of rock burst,and the theory and technology of prevention and control of dynamic and static loads of rock burst in deep mine roadway are studied. The results show that there are two loading ways to in duce the initiation of deep impact,one is the superposition of dynamic and static loads,and the other is the superposition of pure static loads. Therefore,the research on the occurrence conditions of deep impact should focus on the dy namic and static load sources of induced impact initiation. It is considered that the principle of frequent impact in L shaped area of deep working face is that when the working face is far away,the two sides of the free roadway are only affected by the lateral F-shaped cantilever structure. When the working face is close,because the face is connected with the goaf of the adjacent working face,the hanging area of the thick hard roof is also connected,so the sinking ben ding turning amplitude is larger,and the hanging area without collapse will increase the bending elastic performance. It is stored in L area,and when it breaks down,it will cause large dynamic load to act on coal and rock mass in L are a. This paper puts forward a structural model of “double F and large L” force source in the face of goaf and stope in deep work,and presents an algorithm of starting criterion of rock burst in the area of goaf and large L force source in stope. The structural analysis of “double F and large L” force source of mining overburden shows that the load source of induced impact start-up of free roadway is determined in space,and the prevention and control methods of dynamic and static load sources of deep roadway impact are put forward. That is to say,the dynamic load source caused by the cantilever fracture of F-type roof is pre-cracked by blasting. The vertical stress concentration in the two sides of the coal body in the roadway is used for coal seam blasting pressure relief. The high horizontal stress in the roadway floor is used for floor blasting to block its role in promoting the floor. The engineering practice proves that the method can realize the safe mining of the deep strong impact working face.