Research On Large-angle Rotary Mining Technology In Luling Mine Ⅱ 1041 Fully Mechanized Face

In order to solve the problems of layout of the mining roadway caused by the three working faces originally designed and arranged in the Ⅱ 104 east wing mining area of Luling Mine,the problems of frequent moving and short continuous advancement length of the fully mechanized mining face were used.Theoretical analysis,numerical simulation,similar simulation and field observation were used.And other methods,and based on the coal seam occurrence conditions of the Ⅱ 104 east wing mining area and the characteristics of the original roadway layout,the 3 designed original working surfaces are combined into aⅡ 1041 working surface,and the comprehensive mining large-angle rotary mining scheme,process parameters and rotation technology Systematic research has been conducted on key technologies such as requirements and the law of the appearance of the mineral pressure.According to the geological conditions of the Ⅱ 1041 comprehensive mining working face,the selection of the rotary mining scheme and the design of the rotary process were discussed.The rotary mining scheme with a feed ratio of 1:8 was determined.After 54 cycles,the rotary mining was completed by 74°.The numerical simulation method was used to simulate the mining process of the rotary working face.The distribution characteristics of the advance bearing pressure and lateral bearing pressure in the stope of the rotary mining section were mainly studied.The temporal and spatial evolution of the plastic zone of the roof was studied.The analysis of rock displacement characteristics shows that the maximum vertical stress and the maximum displacement of the old roof are different when the working face is mined to different positions.The s No.1 turning point is that the mining is the largest at the turning point of the machine lane,followed by the turning point of No.3,The No.2 turning point is the smallest.The stress distribution at the nose of the nose is also different.The stress concentration factor is larger at the nose and smaller at the nose.Using the similar simulation method,the combination of planar similarity simulation and three-dimensional similarity simulation was used to intuitively reproduce the broken form of the old roof rock during the rotary mining of the Ⅱ 1041 working face,which provided the prediction of the mine pressure during rotary mining and the maintenance of the stope roof in accordance with.The fractal theory is used to analyze the movement and failure characteristics of the overlying rock on the rotating working face,and the law of movement and failure of the overlying rock on the rotating working face is obtained.Using the method of on-site mining pressure observation,the cross-spot method is used to return the working lane and the working face.The wind tunnel was monitored and the characteristics of the roadway deformation law were obtained.By analyzing the support data of the working face,the characteristics of the mine surface pressure were obtained.The maximum working resistance of the support during rotation was 6 481 k N,which was still compared with the rated working resistance.There is a margin of 4.7%,and there is no overturning or squeezing of the support.The deformation of the roadway meets the requirements of safety productionAiming at the problems of Ⅱ 1041 fully-mechanized mining working face broken roof,sliding on the scraper conveyor,and other issues,an effective method for controlling the vertical movement of the scraper conveyor and the rotation angle of the support during the rotary mining of Ⅱ 1041 working face was provided to ensure normal mining in the working face.