Study On Monitoring And Prevention Of Mining Deformation Of Main Facilities Of Closed Mine Industrial Square

At present,China's main energy supply is still coal,and coal resources still play an important role in the development of China's national economy.In order to protect China's economy from the constraints of energy problems,coal enterprises should not only develop new mines,but also fully exploit and utilize the old mines whose resources are about to be exhausted,so as to improve the recovery rate and utilization rate of coal resources.In the mining of old mine,the mining of protective coal pillar in industrial square is a very important link.In order to ensure the safety of mining work,it is necessary to monitor the deformation of surface buildings(structures)and shafts of industrial square.This thesis takes Jinggezhuang coal mine as the research project background,through the analysis of the mining deformation monitoring theory and the general situation of the mine,uses prediction system of mining subsidence based on probability integral method to predict the mining deformation of 0095 and 0098 working faces,and adjusts the mining scheme through the analysis of the prediction results.The results show that:(1)the different mining height of 0095 working face has a great influence on the deformation of surface buildings.When the mining height of 0095 working face is 6m,the second auxiliary shaft and coal bunker with the greatest influence will reach the level IV damage range;When the mining height is 3m,the influence of mining on the main facilities is obviously reduced,and the damage level of No.2 auxiliary shaft and coal bunker is grade III.(2)The results show that the influence of mining can be effectively reduced by the knife handle layout of 0098 working face.When the small face mining is adopted in 0098 working face,the deformation value of main buildings(structures)is significantly lower than that of large face mining.Observation stations are set up around the main buildings(structures)and shafts on the surface to monitor them regularly.The results show that:(1)the deformation of coal bunker and No.2 auxiliary shaft is mainly affected by the mining of 0095 working face.The inclined coal bunker is 4.9mm/m along the short axis,and the coal bunker subsidence is about 88mm;The maximum settlement of the ground around the No.2 auxiliary shaft is 157 mm,and the shaft has a certain deformation.The maximum change of the shaft diameter appears in the east-west direction of the section of 228 m and 268 m,which are 46 mm and 57 mm respectively.The overall inclination of the No.2 auxiliary shaft is 2.32mm/m,which is less than the inclined deformation value allowed by the regulations,and can meet the needs of mine production and equipment withdrawal.(2)The main shaft and No.1 auxiliary shaft are mainly affected by the mining of 0098 working face.The maximum settlement around the main shaft is36 mm and the horizontal displacement is 52 mm;The maximum ground subsidence around the No.1 auxiliary shaft is 36 mm,and the average horizontal movement of the surface is 52 mm.The wellbore diameter has both shrinkage and expansion.The maximum variation of well diameter appears in the south-north direction of the section of 270 m and 297.82 m,which are 36 mm and 45 mm respectively.The overall inclination of the shaft is 0.6 mm/m,and the shaft is still in a safe state.According to the monitoring results,the relevant facilities and equipment were repaired.According to the actual damage situation,the deformation and damage of shaft,shaft wall,tank way and Winch House are reinforced;The channel beam,cage guide roller and auxiliary shaft friction wheel were replaced;The winch,derrick,fan and other equipment were leveled.The research results provide a guarantee for the safety of Jinggezhuang Mine,and valuable experience for other aging mines.This thesis has 43 pictures,26 tables and 57 references.