An early warning method and application of water inrush from coal mining floor based on the correlation effect between daily cumulative micro-seismic indicators and water level
The difficulty of quantitative early warning of water inrush disasters on the coal mine floor is the selection of the sensitivity index.At present,the early warning of water inrush based on microseismic often selects multi-source data,and lacks detailed analysis of indicators closer to the development of water-flowing fractures.According to the field monitoring methods of 16091 working face in Zhaogu No.1 Coal Mine,the correlation and sequence relationship between microseismic event frequency index,energy index and water level change are analyzed in this paper.Practice shows that microseismic and water level have a good spatial and temporal correlation.Based on this,a comprehensive early warning index of floor water inrush disasters based on microseismic-water level is established.The following results are obtained.(1)During the period of high frequency and high energy of microseismic,the water level began to decline,and the water inflow increased after a while.In the low frequency and low energy period of microseismic,the water level began to rise.The decline time and amplitude of the water level in the observation holes correspond to the spatial position of the distance from the working face.It shows that microseismic and water level have an obvious correlation in time and space.(2)Under the combined action of mining disturbance and floor water pressure,the frequency and energy of microseismic events on the coal seam floor increase,and the range continues to extend.Then the water channel is formed,and the water level of the observation hole declines.With the periodic pressure,the cracks gradually closed.At this time,microseismic events are low frequency and low energy.Under the supply of water source,the confined water level rises to a certain height and tends to be stable.(3)Based on the correlation effect between microseismic and water level,the daily cumulative frequency of floor microseismic,daily cumulative energy,and daily decline of water level in four observation holes are taken as the basic parameters,and the comprehensive early warning index of microseismic-water level is established utilizing basic index standardization,weight calculation.After calculation,the comprehensive early warning index threshold of water gushing(inrush)in 16091 working face is 0.30.(4)The field application results of the project show that when the comprehensive early warning index value exceeds the threshold value of the working face,there is a large underground water inflow after the alarm.It has a good effect on the early warning of water inrush from the coal seam floor,so the microseismic-water level can be used as a comprehensive early warning index of floor water inrush.
mining engineeringcoal mine floor water disastermicroseismic monitoringwater level monitoringcorrelation effectcomprehensive early warning indexes
万方数据
维普
