Study On The Law Of Mine Tremor And Rockburst Hazard Around Normal Fault

It is significant to study the characteristics of overlying strata movement in fault zone, mine seismic distribution law and rock burst control near the fault when the working face is through fault. With high stress concentration in fault area of working face, high-energy mine seismicity induced by overlying strata fracture in the fault area can easily lead to the occurrence of rock burst dynamic disasters. So, according to the mechanism of induced rock burst by overlying strata fracture in the fault area of working face, the roof stress condition in fault area is analyzed by mine pressure theory.The overlying strata near the fault of working face dynamic and static combination inducing rock burst principle is studied. The stress distribution ahead of the working face during the working face draws close to the fault and go away form it are analyzed though numerical simulation. At the same time, micro seismic events energy, frequency law, strong mine seismic distribution law induced by overlying strata breaking are also studied. Finally, the rock burst hazard monitoring, prevention and control integrated system during the mining process through faults is proposed.The reason why the frequency of rock burst incidents occurring in the fault region is high is explained by analyzing the sources of high static load and dynamic load in the working face. The static load on the coal pillar before 1304 working face mainly comes from gravity stress of overlying strata, lead abutment pressure and stress formed by the rotation of overlying strata. The dynamic load mainly comes from energy delivered to working face produced by the broken of overlying strata.The law of maximum stress and its distribution ahead of working face with various mining distances is stimulated using FLAC3 D software. Results of simulations by FLAC3 D software show that in the initial stage of mining, maximum value of stress ahead of working face increases as the distance of mining increases to a stable value, then as working face draws close to fault, maximum value of stress ahead of working face increases. When working face leaves away from fault, maximum value of stress ahead of working face decreases.The sign of strong mine tremor is concluded by analyzing tremor energy and frequency and location in the area near the fault. Mine seismic frequency is at a low level before strong mine pressure. Mine seismic frequency decreases from a high level to a low level is a sign of energy accumulating in the rock around working face. Daily energy released by mine seismic at a high level and increasing constantly is also a sign of strong mine pressure.The rock burst risk assessment and hazard zones division is on the background of 1304 working face of Zhaolou Mine through fault, on the basis of which a complete rock burst hazard monitoring and forecasting technical system is established. Safe mining of working face is guaranteed and great social and economic benefits are achieved.mining engineering; microseismic effect; dynamic and static load; prevention...