Support Technology Of 3206 Tailway With Dynamic & High Pressure In Taitou Collery

In recent years,with the increasingly tense relation of mining replacement,the increase of mining depth and the increasingly complex mining conditions,the tension of mining replacement has been intensified.The main coal seam of Shanxi Xiangning Taitou coal mine is No.2 coal seam.In order to relieve the tension of mining replacement,the deep well dynamic pressure driving has appeared.Based on the project background of deep well dynamic pressure driving in 3206 working face of Taitou coal mine,this paper determines the appropriate width of the section coal pillar between 3204 working face and 3206 tailway,and determines the stoping distance of3206 tailway combined with the analysis of the coal pillar and roadway under different buried depth.Through the research on the current situation of roadway support,the support scheme is optimized to maintain 3206 Tailway Good,meet the use requirements,this paper uses the combination of theoretical research,laboratory experiments and numerical simulation,field industrial way to conduct a systematic in-depth study,and get the following main conclusions:?1?This paper analyzes the broken form of the goaf roof in the process of deep well dynamic pressure mining,and studies the stress distribution of surrounding rock around the goaf.Through the study of the key layer of the goaf roof,it is concluded that in the mining engineering,the key layer 1 and 2 will break,and the support of3206 return air roadway will be affected by the broken.The peak position and influence range of lateral support pressure and leading support pressure are obtained from the theoretical level,and the influence range of lateral support pressure and leading support pressure is further determined through FLAC^3D numerical simulation,so as to prepare for the determination of coal pillar width.?2?This paper analyzes the stress condition of coal pillar and the choice of roadway location under different width,calculates the theoretical width of coal pillar in the section by using the elastic-plastic theory and empirical formula method,and then combines with FLAC^3D simulation,obtains that the appropriate width of coal pillar in 3206 return air roadway section is 20 m.?3?By using FLAC^3D numerical simulation software,the influence of buried depth on coal pillar and roadway in dynamic pressure mining is studied.Combined with the actual situation of Taitou mine,the stoping distance of 3206 return air roadway is determined as follows:from 50m before 3206 return air roadway and 3204working face meet to 70m after they meet.?4?Combined with the actual engineering geological conditions of 3206 working face return air chute in Taitou coal coking mine,Xiangning County,Shanxi Province,the application and test of the relevant research results show that the deformation of the roadway is obviously smaller,the section coal pillars are basically stable,making3206 return air roadway meet the production requirements,providing a new breakthrough for the deep well dynamic pressure roadway support in China.There are 45 pictures,8 tables and 100 references in this paper.