Deformation And Failure Regularity Of Mining Floor And Evaluation Of Water Resistance In 11223 Working Face Of Pan Two Mine

From a strategic perspective or an energy perspective,coal reserves play the most important role.In recent years,most of the coal mines in our country have entered into deep mining.The threat and influence of water damage are becoming more and more serious,which seriously affect the normal production of coal mines,and it is a cruel threat to the life safety of miners and the safety of national property.Therefore,it is urgent to push forward the prevention and control measures of mine water disasters.This paper takes the 11223 working face of Pan two mine as the research object.Consult and analyze the basic data of geology,hydrogeology and so on.On this basis,using the FLAC3 D numerical simulation,the elastoplastic theory,the damage mechanics method and the analytic hierarchy process model are used to simulate the factors affecting the water resistance of the bottom slate in the bottom of the working face,and the results of the evaluation of the water resistance performance are determined.It has important theoretical and practical significance to solve the safety and efficient production and construction of mining area,so as to improve the economic and social benefits of coal mine.The results of the research are summarized as follows:(1)through the understanding and analysis of the research area and combined with the FLAC3 D numerical software,the law of the deformation and failure of the floor mining is simulated,and the failure depth of the floor is determined.The maximum failure depth of the 3 coal mining under the complete bottom is about 21 m,and the plastic failure range of the fault upper plate is between 16 m and 20 m when the fault is contained,and the plastic failure range of the footwall is between 10 m and 17 m.When the whole floor is under the complete floor,the damage depth is about 20 m to 24 m,and the plastic failure of the upper plate is about 13 m when the fault is divided into layers.The plastic damage of the footwall is about 25 m.(2)using the elastoplastic theory method and combining the geological data of the pan two mining area,the results of the mining failure depth of the bottom plate of the study area are calculated to be 13.72 m and 12.15 m,respectively.(3)the method of damage mechanics.The damage depth of the damaged floor is calculated,and the result is 11.21 m.(4)the evaluation value of barrier performance of 11223 working face is 0.4995,belonging to grade II B.So the barrier water performance is better,but under certain conditions,floor limestone water bursting will happen.