Study On Bolt And Anchor Structure Of Coal Seam Roadway With Rock Burst Risk

The generation of rock burst is common action of static and dynamic loads. Bolt andmesh structure has a dominant role in the support method of our domestic mines. Currently,the support problem under static load in the coal seam roadway without dynamic pressureappearance has basically been solved. With the increase of mining life of the mine, miningdepth has increased, and the mining conditions are becoming increasingly complex. It hasbecome a key and difficult research on roadway dynamic instability problem of roadwayunder multiple factors. And traditional roadway theory cannot fully explain surrounding rockstability control principle under dynamic load.For this situation, this paper initials form the dynamic load on the failure mechanism ofcoal roadway. The function and spread principles of rock burst dynamic load are summed up.The failure process of support structure under dynamic load is analyzed. The mechanicalmodel is established to calculate the energy of support system. Through the numericalsimulation methods, dynamic and static load state and stress response are compared underdifferent support conditions. And from the perspective of site field, the application of rockburst prevention under support system is discussed.The energy source type generated by roof breaking and its size are analyzed using wavemechanics. The source model is built and the dynamic load attenuation during propagationlaw is noted.When impact occurs, seismic waves emitted by the source apply impact load to roadway.The velocity of roadway and its anchor body change a lot in a very short time interval.According to the principle of conservation of energy, the failure process of support structure isanalyzed. On basis of static and dynamic load combined inducing rock burst theory, the staticand dynamic load on the support structure damage and the relationships between the load androck burst are proposed.Using FLAC2Dnumerical simulation software, static load levels under different supportconditions are analyzed. In the case of support, the displacement surrounding rock decreasesrapidly, and the whole anchor has better results than the end anchor. But the anchor andanchor-mesh full support are not very obvious. When different supporting roadway affectedby mining vibrations, the side and the roof and floor will have some displacements under theshock wave, and the effect of the surrounding rock control action is obvious. Thedisplacement of roof is greater than the floor. For the study of the stress revolution of repeatedshock wave, stresses expansion band will formed in the roadway area under secondary ation, and the surrounding rock will damage under the gradual repeated back and forth stretch.Combined with site engineering, we take2501mining area in Huating coal mine and2100and2200mining area in Xingdong coal mine as research objective respectively for rockburst prevention. During mining process of Huating thick coal seam, the coal pillar side nearthe goaf area is rockburst-prone.The results are analyzed by seismicity data and confirm thatmost of the impacts have caused the failure of floor and anchor-mesh. So it is important tochoose suitable support way to prevent rock burst. The past and exit support method inXingdong mine are analyzed, and the advantages and disadvantages in Xingdong mine arepointed out. Under better control conditions, it needs more consideration of rock energyrelease factor, which can design more suitable support mode for rock burst preventionroadway.