Research On Roof Disaster Monitoring Technology In Heavy Steep-thick Coal Seam Mining

In the north area of the coal mine of the coal mine in the coal mine of the coal mine,the roof of the roof is treated by blasting on the ground and the blasting of the process alley,and the roof of the top hole is trearted in the layered construction.The surface of the roof has different degrees of collapse and crack,but the continuous collapse pit is not formed,and at the same time,the occurrence of the roof is observed on the ground,and the local existence is found.There is still a certain hidden danger of roof safety during the mining process.The occurrence of steep coal seam is unique,with the deepening of mining depth and the influence of mining disturbance,the instability and deformation of coal and rock structure and the probability of large area roof fall also increase.In order to monitor the roof disaster more scientifically and accurately,multi means joint monitoring has become a trend of development in order to monitor the roof disaster more scientifically and accurately by monitoring the stability of the roadway surrounding rock(main roof)in mine mining.The coal seam dip angle of the 43#West Wing fu,lly mechanized top coal caving face in the north mining area of wdong coal mine is 45 degrees,and the mining method of horizontal sublevel fully mechanized caving is adopted.Through the field engineering geological survey,the study on the stability of coal and rock mass in the mining process of the West Wing fully mechanized coal caving face of the 43#coal seam in the north mining area of wutdong coal mine is mainly carried out from three aspects of laboratory rock mechanics experiment,numerical calculation and field monitoring.Through the study of the possibility index diagnosis and evaluation method,the macro risk assessment of the working face mining is carried out from the mining stress and the coal rock impact tendencies,and it is determined that the impact pressure is likely to occur during the mining face mining,and the distribution of the stress field distribution in the coal rock layer under different open mining distance is analyzed by numerical simulation.The analysis of the evolution law shows that the influence range of the advanced support pressure is about 0-60m,the peak value of the forward support pressure occurs in about 10-25m area from the working face,and the regional risk of abnormal stress in the coal and rock mass during the mining process is determined by the dynamic monitoring of the roof,the monitoring of the drilling chip method and the monitoring results of the drilling peep.To ensure the safe production of the working face,danger reduction measures(pressure relief and strengthening support)should be carried out in the area.This study has a certain guiding significance for the monitoring of mine disaster during the mining process of fully mechanized caving face with steep and extra thick coal seam.It is of great scientific and practical significance to improve the safety and efficiency of the steep seam mining.