Research On Prevention And Control Technology Of Rock Burst In Large Depth Working Face Of Gaojiapu Coal Mine

The geological structure area and the coal pillar high stress area are the areas where rock bursts often occur.This article uses the 204 working face of Gaojiabao Coal Mine to study the overlying rock structure characteristics of the 204 working face,the stress distribution characteristics of the working face surrounding rock,and mine earthquakes.The law of temporal and spatial evolution is to analyze the pressure relief effect of rock burst prevention technology on the working face.Theoretical analysis shows that: According to the theoretical analysis of the key strata,the overlying strata fractured after the 204 working face was stopped,and the overlying strata were not fully mined.It is inferred that the main key strata did not break.Numerical simulation results show that: before the start of mining at 204 working face,the stress level in the mining area of the working face is already at a high state;as the work faces approaching and passing through the syncline structure,the vertical stress peak value of204 working face continues to rise;when working at 204 When the face stoping position exceeds the 203 stop line and advances to the misaligned area outside the cut,affected by the excavation of the 204 working face,the stress concentration in the coal pillar area between the204 working face and the 203 working face rises rapidly,and the risk of rock burst is relatively high.The microseismic monitoring results show that when the working face passes through the syncline structure-affected area,as the working face gradually approaches the syncline axis,the frequency of mine earthquakes,mine earthquake energy,and mine earthquake energy per meter gradually increase.At this stage,the overall working face The seismic energy of the mine did not rise sharply,indicating that the reinforcement and pressure relief measures have a good pressure relief effect during the mining face to the syncline;when the mining face passes through the stop line of the 203 working face,as the working face advances,the mine Significant changes in the law of earthquake activity indicate that the conventional pressure relief measures in this area are insufficient,resulting in a high level of seismic energy per meter of mine,and a higher risk of rock shock.The research results of the thesis effectively analyze the effect of the prevention and control measures of rock burst in 204 working face,and provide reference for the subsequent working face anti-scouring work.This paper has 76 pictures,26 tables,and 67 references.