Risk Analysis And Prevention Technology Of Water Gushing In Hanglaiwan Coal Mine

In view of the problem of mine water inrush under the close aquifer,based on the mining of No.3 Coal Seam in hanglaiwan coal mine,on the basis of the analysis of the characteristics of surface subsidence,the paper studies the height of the water diversion fracture zone in the overburden of the comprehensive mining face by using the methods of numerical calculation and theoretical analysis,and predicts the monthly average water inrush of the mine five years later,analyzes the risk of water inrush in No.3 coal seam,and puts forward the technology of preventing and controlling water inrush.The measured data of surface subsidence of working face 30101(mining height of 4.5m)are analyzed.The results show that the maximum subsidence of the surface is 2.5m,which starts to sink 15 m behind the working face;the surface subsidence is large in the range of 120-150m;after the mining of working face,a local "u" structure is formed along the coal seam trend,with the depression range of about 330 m.At the same time,FLAC3 D numerical simulation shows that the maximum subsidence of the surface is 2.75 m.In this paper,FLAC3 D numerical simulation,empirical formula prediction,and borehole flushing fluid leakage measurement are used to study the height of water conducting fracture zone in mining overburden.According to the numerical calculation,the height of the water diversion fracture zone is 102.1m(22 times of the mining height),the height of the water diversion fracture zone calculated by the empirical formula is 69.71 m,and the measured height of the water diversion fracture zone is 98.1m.According to the height of the water diversion fracture zone obtained from the above study,combined with the geological data of hanglaiwan coal mine,it is determined that the mining of the coal seam must lead to the overlying qilizhen sandstone aquifer.By using MATLAB software to fit the data of mine water inflow,it is predicted that the average monthly water inflow of the mine after 5 years is 1367.1m3/h,which is 46.3% higher than the current average monthly water inflow(934.2m3 / h).According to this,the drainage capacity of the mine is designed and verified to ensure that it meets the requirements of the regulations on the drainage capacity of the mine in the detailed rules for the prevention and control of mine water.According to the above statistical analysis,combined with the successful experience of prevention and control of mine water inrush in similar and adjacent mines,this paper analyzes the risk of mine water inrush in the mining area of hanglaiwan coal mine,and puts forward the prevention and control technology of mine water inrush,such as setting up hydrological monitoring and early warning system,setting up waterproof and safety protection coal pillars,which provides a scientific basis for the safe production of coal mines and guarantees the safety of miners' lives and properties It also provides a reliable technical guarantee for the safe and efficient production of the mine.This paper has 25 figures,11 tables and 107 references.