Study On Risk Assessment And Depressurization Technology Of Bump Rock In The Thick Coal Seam Mining Kilometers Of Coal Mine

In order to solve the problem of rock burst in 107 working face of Km depth coal seam, according to the geological structure and actual production situation in Tengdong mine, Using the method of multi factor analysis, the method of numerical simulation, the method of comparative analysis and the micro seismic monitoring technology to analysis and research on the risk assessment of the impact of the working face and the prevention and control technology. The technology of rock burst prevention and control is constructed that is suitable for deep thick coal seam.Firstly, the risk of its working surface is evaluated by using the comprehensive index method and the probability index evaluation method, and the possibility of the occurrence of rock burst risk is judged. By using the method of multi factor coupling, the influence range of each impact factor is analyzed, and the working area is divided into the corresponding dangerous area and the magnitude of the risk level.Secondly, using the numerical simulation method of FLAC3 D to establish the numerical model of the 107 working surface, and study the distribution range and the concentration of stress in the roadway layout and mining process. The purpose of this paper is to analyze the variation of the stress concentration area and the numerical value of the overlying strata in mining process.Thirdly, team using the method of comparison and analysis, based on the working surface geological conditions, mining technology and the actual situation, choice the large diameter borehole pressure relief method for the prevention and control of rock burst. A corresponding numerical model is established to optimize the technical parameters such as diameter, row spacing and layout of the large diameter drilling and pressure relief method, which is suitable for the 107 working face. The effect of using the method of drilling chip to verify the effect of the unloading measures.Finally, The project team to monitor "microseismic events" by using the method of microseismic monitoring in the mining process,make the early warning of impact pressure and test the results of the preliminary risk assessment by the scope, quantity and energy of the incident.