Prediction method of deep mining dynamic disasters and its application in Pingdingshan mining area

The mine dynamic disasters have seriously threatened the safe production of deep mines in China. However,the theory and method for accurately predicting these disasters are limited. In order to prevent and control the dynamic disasters in the deep mining of Pingdingshan mining area,the natural geo-dynamic conditions of Pingdingshan mining area is studied. The potential dynamic disasters in the coal mine are predicted by using the re- gional indexes such as active structure,maximum principal stress,stress gradient and so on. It is found that the curvature of the terrain has a great influence on the probability of coal and gas outburst in the eastern mining area of Ping- dingshan. The ratio of coal and gas outburst in the positive curvature radius of the eastern mining area of Pingdingshan accounts for 80. 21% of the total outbursts. At the same time,based on the energy characteristics of the coal and gas outburst system,the critical energy of coal and gas outburst in the eastern mining area of Pingdingshan is determined to be 106 J. On the basis of the study on the Division I to V active tectonics by using the geological dynamic zoning meth- od in the early stage,the impact of mining activities is further considered. The patterns of dynamic disasters in the tar- get coal seams and target mining areas are clarified,and the second-level prediction of dynamic disasters is carried out. Class Ⅵ and V fault structures are divided into the No. 8,No. 10 and No. 12 mines,and the distribution character- istics and interaction relationships of the fault structures are determined. The corresponding spatial information analysis system is established,and the activity law of the active structures is analyzed. It is found that the coal body gas in the eastern mining area of Pingdingshan is mainly controlled by the geological structures such as the compound, joint and combination among folds,faults and other geological structures. Coal and gas outburst accidents occur in the geo- logical tectonic belts,accounting for 69. 6% of the total outbursts. At the same time,the distribution pattern of regional fault structures and the local distribution characteristics of coal and gas outbursts in the active fault areas of grade VI and V in the eastern mining area of Pingdingshan are determined.