Research On Roof Movement Law Of Mining Working Face In Steep Inclined Coal Seam

Compared with the gently inclined coal seam,the mining characteristics of the roof of the stope are more specific than the steeply inclined coal seam.In order to improve the mechanization of the mining of steeply inclined coal seam,it is urgent to provide the corresponding mechanical theory and the law of appearance of the coal pressure.In this paper,the C5103 working face of Wanshun Coal Mine is taken as the engineering background.Through theoretical analysis,numerical simulation and field monitoring research methods,the roof movement rule of mining face in steeply inclined coal seam is studied,and the ZZ4000/15.5/31 JD hydraulic support is The adaptability of Wanshun comprehensive mining face is calculated and analyzed.The main research work,content,conclusion and significance are:Through the establishment of the roof beam mechanical model of the steeply inclined stope,it is found that the coal gangue at the top of the working face is destabilized and then moves to the lower end to cause filling effects,so that the breakage of the roof of each face has a time-series difference.The order of instability is Upper end,middle end,lower end.Through the establishment of the plate model analysis,it is concluded that the initial break and periodic break of the roof of the steeply inclined working face are respectively inclined "O-X" type and inclined "C-X" type.Using FLAC3 D software to study the stress distribution characteristics of steeply inclined working face affected by different coal seam inclination angle,working face length and driving distance.The analysis shows that the peak value of the stress concentration area at both ends of the stope is inversely proportional to the dip angle,and the pressure relief area is proportional to the dip angle;the peak value of the stress concentration area is proportional to the length of the steeply inclined working face,and the peak value increases sharply after 100m;The advancing distance is proportional to that,after advancing 100 m,the peak stress of the stope tends to be stable.By observing the maximum working resistance and initial supporting force of the pillars in the three measurement areas of the C5103 working face,it is concluded that the ore pressure appears as follows: the basic top cycle is not obvious when the pressure is applied;the pressure step and pressure strength are the lower end of the work surface >Middle end>Upper end.The initial support force of the working face pillar is also the lower end>middle end>upper end of the working face;the overall initial support force of the stope accounts for a large proportion of the rated initial support force,and the support method adopted by the working face is effective.Based on the research on the roof movement law of steeply inclined working face,the maximum working resistance of ZZ4000/15.5/31 JD hydraulic support selected for fully mechanized mining face transformation is theoretically calculated,and the analysis shows that the support can adapt to the working face support Claim.The calculation and analysis of the beam model and the slab model jointly reveal the breaking rules of the roof of steeply inclined coal seam;the numerical simulation study reveals the stress distribution law of the stope of steeply inclined coal seam under different influencing factors;Appearance law;The adaptability of the ZZ4000/15.5/31 JD support is obtained through theoretical calculation,which provides a theoretical basis for the safety,high-efficiency production and mechanized transformation of fully mechanized mining in the steeply inclined working face of Wanshun Coal Mine.