Study On Optimizing Strata Level Of High Drainage Roadway In Sijiazhuang Coal Mine

Sijiazhuang Coal Mine adopts U-shaped ventilation + low-level extraction lane +high-level extraction lane.However,in the production process of fully mechanized mining face,gas overruns often occur in the corners and return air lanes of the face.The main reason is that the layout of the working face towards the high-drawing lanes is determined by experience,and there is no scientific theoretical basis.Therefore,in view of the above-mentioned problems,this thesis carried out the optimization research on the high-draw layout of the strike direction of the roof of 15110 fully mechanized coal mining face in Sijiazhuang Coal Mine.Through on-site investigation,theoretical calculation,numerical simulation of FLUENT software and engineering application,it was verified whether the face moving towards the high pumping lane can significantly reduce the gas concentration in the upper corner and return air lane area,and determine the working face moving towards the high pumping lane layout layer Whether the bit is reasonable.After research and demonstration,moving towards high pumping lanes can significantly improve the safety factor of coal mining at the face and ensure the safe recovery of fully mechanized face.The main research results and conclusions obtained by optimizing the layout of high-draw roadways in roof striking of 15110 fully mechanized coal mining face in Sijiazhuang Coal Mine are as follows:(1)According to the on-site geological conditions and mining technical conditions of the Sijiazhuang Coal Mine,study the distribution characteristics of the“ three belts ” of gas relief and pressure migration in the 15110 comprehensive mining face of the Sijiazhuang Coal Mine.After analysis and calculation,the corresponding “three belts” of gas pressure relief and migration in the overlying rock layer are obtained: the area of the uneasy desorption zone is located between227.62 m and 0m,and the area of the pressure desorption zone is located between232.05 m and 247.96 m.The area of the gas conduction fracture zone is between251.25 m and 247.96 m.(2)Through relevant theoretical analysis and formula derivation,the spatial permeability distribution function of the goaf is obtained.Using the relevant relevant empirical formulas to determine the approximate range of 15110 fully mechanized coal mining face roof strata high pumping roadway,that is,the horizontal distance of15110 fully mechanized coal mining face roof stroking high pumping roadway and return air roadway is about 48 m,high pumping roadway and 15 #the vertical distanceof coal seam roof is about 53 m.Six different layout plans for high-drainage roadways in space are given,and gas drainage simulation is carried out on the layout plans of high-drainage roadways using FLUENT numerical simulation software.Through the analysis of the gas effect on the relevant gas parameter data,the optimal layer layout parameters of the high-drainage roadway are obtained,that is,the horizontal distance between the high-drainage roadway and the return air roadway in the 15110 fully mechanized coal mining face is 48 m,which is vertical to the 15# coal seam roof The distance is 53 m.(3)According to the actual engineering geological conditions of the mine,combined with the optimal layout parameters of the high-drilling road space,the construction plan of the 15110 fully mechanized coal mining face roof strata high-drain road space is developed.Through the analysis of the gas extraction effect in the high-drainage roadway,no gas overrun occurred in the corners and return air lanes of the 15110 fully mechanized coal mining face;the average gas concentration in the high-drainage roadway in the roof movement always fluctuated around 30%;With the 15110 fully mechanized coal mining face continuously advancing,the gas drainage volume towards the high-drainage roadway is showing an increasing trend.There are 25 pictures,7 tables and 81 references in this paper.