Optimization Of Technical Parameters For Environmental Geological Dynamic Disastersin Water Injection Of Pingdingshan No.11 Mine

The combined impact of ground pressure and gas outburst is a serious environmental geological problem in the process of deep coal mining.As the mining range and depth of mines increase,the combined power disasters have caused the deterioration of the underground space environment,which seriously threatened the safety of workers and seriously affected the development of deep coal resources.The coal seam water injection technology to prevent and control the power disaster is a very effective technical means for coal mining,but with the increase of mining depth,ground stress and coal permeability,the guarantee of water injection effect has been a difficult problem.The optimization of water injection parameters plays an important role in improving the water injection effect.However,for low-permeability and high-stress coal seams,there are few studies on the influence of water injection on the change of coal seam stress field.In this paper,the actual water injection of 24030 large mining height working face of Pingmei No.11 Mine is carried out,and the injectionability analysis of coal seam water injection is carried out.In the above,the research contents and results of the water injection optimization scheme are as follows.The coal sample injection and physical mechanics experiments were carried out,and the 24030 working face was made into the coal injection layer,which indicated that the coal seam water injection work could be carried out,and the coal body impact tendency was weakened after the water immersion.The experimental results show that the water injection can prevent disasters.occur.However,through investigation,it is understood that the actual water injection effect of the 24030 working face is not good and further research is needed.The movement process of water in coal seam is studied.The water-gas-solid equation of motion is established.The basic principle of coal seam water injection is analyzed.The results show that coal seam water injection can displace gas and reduce impact tendency.The more uniform the coal body pores,the greater the water saturation of the coal body,and the less gas in the coal body.The wet radius analysis of the coal seam of 24030 working face was carried out by numerical simulation.The results show that the wetting range increases with the increase of water injectionpressure and water injection time,but when the water injection pressure is 5MPa and the water injection time is 7d,it is wet.The increase of range is no longer obvious,so the water injection pressure is 5MPa and the water injection time is 7d.The numerical simulation analysis of the original water injection parameters shows that the original water injection parameter has a small wet radius and fails to meet the water injection requirements.The scheme shows that the wetting range affects the stress field change.When the drilling distance is 6m and the drilling arrangement is up and down staggered,the wetting range is the best and the stress concentration is the lowest,effectively reducing the 24030 working surface.The risk of composite dynamic disasters during the recovery process.This result is an optimized parameter for water injection.