Study On Risk Prediction And Prevention Technology Of Rock Burst In Jixian Coal Mine

Rock burst is one of the most serious dynamic disasters in underground coal mining.Rock burst is influenced by many factors,so the occurrence mode of rock burst is different in different mines,coal seams and mining areas.It is necessary to study the influencing factors and risk models of rock burst.Improving the accuracy of rock burst risk prediction is the basis of preventing rock burst.The prediction of rock burst risk is the premise of implementing comprehensive prevention measures and plays an important guiding role in the prevention and control of rock burst.Based on the analysis of the factors that influence the occurrence of rock burst,the multi-factor model recognition probability prediction method for the risk prediction of rock burst was established.The multi-factor pattern recognition and prediction method of rock burst was used to determine the structural form of fault block,the distribution characteristics of stress field,the lithologic structure of roof and mining depth.By analyzing multiple influencing factors of mine rock burst,the model of rock burst was determined,and the research area was divided into finite prediction units to realize the probability prediction of model recognition by unit.According to the probability prediction results,the risk areas were divided.It promoted the development of rock burst prediction from point prediction to regional prediction,from single factor prediction to multi-factor prediction,from qualitative prediction to quantitative prediction,and improves the accuracy of rock burst prediction.Accurate risk prediction reduced the amount of work for preventing and controlling rock burst and provided a scientific basis for taking reasonable anti-bump measures.Based on theoretical analysis,laboratory experiment,field test and underground investigation,this paper divided the fault block structure of Jixian coal mine and established a geological structure model connecting fault block structure with mining engineering.Through theoretical analysis and field geological investigation,it is shown that the Jixian coal mine is located in the "kou" structural depression area,which is easy to gather energy.The stress state of rock mass in mine field was analyzed and the tectonic stress zone was divided.The rock burst in Jixian coal mine is located in the stress gradient zone,which provides stress conditions for the occurrence of rock burst.Based on the analysis of the influencing factors and the mechanism of mine rock burst,the multi-factor model recognition probability prediction method of burst risk was applied to study the rock burst risk of Jixian coal mine No.9 coal seam.According to the critical value of risk probability,the risk of the prediction area was divided into non-burst risk,weak burst risk,medium burst risk and strong burst risk.Based on the prediction results of multi-factor model recognition probability of rock burst risk,the risk of the project position can be determined in advance when roadway driving or working face mining enters different prediction units,and corresponding treatment measures can be taken in advance to reduce or avoid the occurrence probability of rock burst in jixian coal mine.The results of this paper are applied to the risk prediction of rock burst in Jixian Coal Mine.The danger of rock burst in No.9 coal seam was divided into no-impact danger,weak-impact danger,medium-impact danger and strong-impact danger.Based on the multi-factor pattern recognition and grading prediction results of rock burst risk,the danger of engineering position can be determined in advance when the roadway driving or panel mining enters different prediction units,and the corresponding control measures can be taken in advance to reduce or avoid the occurrence of rock burst in Jixian coal mine.The multi-factor pattern recognition method improves the accuracy and precision of prediction.According to the prediction result of multi-factor pattern recognition,the dangerous areas of fourth working faces were determined,and the corresponding prevention and cure measures were put forward to realize safe production.Based on the research results and engineering practice,the prevention and control technology system of rock burst in jixian coal mine was established.There are 79 figures,25 tables,and 120 references in this paper.