Study On Induced Mechanism And Control Technology Of Impact Rock Pressure In Hujiahe Coal Mine

Rock burst is one of the difficult problems in the research of safe and efficient mining of coal mine due to its complicated causes,multiple influencing factors and serious disasters.The monitoring and warning of rock burst and integrated prevention and control technology are of great significance to the safe and efficient production of coal mines.Based on the geological conditions and mining status of No.4 coal seam in Hujiahe Coal Mine,this paper uses literature research,theoretical analysis,numerical simulation and comprehensive analysis to carry out the research on the inmpact mechanism and prevention technology of Hujiahe Coal Mine.Improve the mine’s seismic shock response capability,effectively curb the occurrence of major malignant accidents,and achieve safe and efficient recovery of underground coal resources.The numerical simulation and on-site measurement were carried out to analyze the structure of the overlying strata and the key layer movement in the extra-thick coal seam mining.The breaking motion law of the key layer in the extra-thick coal seam mining was obtained,and the initial pressure and periodic pressure of the working face were analyzed.The step distance is analyzed,and the influence of the composite effect of the key layer on the pressure step is analyzed.It is concluded that the irregular fault zone is formed after the initial fracture of the extra-thick coal seam,and the high-level basic top reaches the limit span and then forms the three-joint.The arched balance structure;the initial stepping distance of the basic top of the working face of Hujiahe Coal Mine is 51.8m,and the average step of the pressure step is 15.1m,The pressure step is generally "two small and one big",alternately,the average movement The load factor is 2,28 and the mine pressure appears severe.The theoretical analysis method is used to study the control mechanism of overburden movement and stress change on rock burst,from mining depth,coal rock impact tendency,coal seam thickness variation,geological structure,section coal pillar and roof rock stratum structure.The dangerous impact of rock burst is analyzed.The cause of the impact rock pressure in Hujiahe Coal Mine is mainly the shock induced rock pressure caused by roof movement under the action of plateau rock stress.From the aspects of regional defense and dynamic active solution,the engineering application of integrated mine rock prevention and control technology is carried out.The regional defense technology mainly chooses the reasonable section coal pillar width,correctly arranges the position of the open cut and the stop line,selects the appropriate mining sequence,mining method and coal mining technology;the control of the impact mine pressure is mainly There are large-diameter drilling pressure relief,coal blasting pressure relief,roof pre-splitting blasting,floor pressure relief measures,etc.,and the use of microseismic,geophone,cuttings,mine pressure monitoring and other methods to test the impact of dangerous effects.By adopting the above measures,the danger of impact rock pressure in Hujiahe Coal Mine is effectively alleviated,and the safe mining of the working face is guaranteed.