Practice on prevention and control technology of rock burst in coal seam main roadways of Xinjulong Coal Mine
In view of the risk of rock burst,on the coal seam main roadway,caused by the disturbance at the end of the mining progress in No.3303 working face at Xinjulong Coal Mine,we applied microseismic monitoring to analyze the distribution and evolution law of the fractures in advanced coal and rock mass during mining,and theoretically analyzed the stress distribution pattern in the protective coal pillar area of the main roadway.Used a numerical simulation to analyze the stress distribution characteristics in main roadway coal pillar areas before and after working face mining,and the stress distribution and evolution law of the coal seam roadway under working face mining influence,and explained the mechanism of rock burst in the main roadway area at Xinjulong Coal Mine.Research showed that the stress distribution in the protective coal pillar area of the main roadway was in a"saddle shape",and mining stress and advance abutment pressure doubled and gradually increased due to the face mining.The advance abutment pressure of No.3303 working face influenced about 180 m.When the distance between the working face and the main roadway was less than 180 m,the impact of vertical stress caused by mining was more obvious,and the risk on the roadway sidewall was increased.In addition,by optimizing the position of the terminal line in the No.3303 working face and adopting targeted prevention and control measures,such as strengthening support in the roadway,roadway coal pressure relief,and roof blasting pressure relief,at the end of mining progress,mine tremors occurred less with lower disturbing,and the prevention and control effect of rock burst was significant.
coal seam main roadwayrock burstmicroseismic monitoringnumerical simulationdisaster prevention and control
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