Study On Surrounding Rock Control Technology Of Roadway Excavation Along Goaf With Large Section Of Coal Seam Impacted By Deep Well

Tangkou coal industry co.LTD shandong zibo mining group in north fourth modern mines,production capacity of 4 million tons/year of check and ratify,the mine mining depth is 850 m to 1100 m,its owners in the thickness of coal seam no.3 in about 10 m,level elevation is controlled in-990-m,generally USES the caving production,has a large mining depth,high strength,impact bias,roof strata characteristics of high gas content,geothermal,serious,brings to the safety mining of coal mining work face hidden dangers.In this paper,based on 630 tang mouth coal mining area layout planning,deployment,empty mining area shape,geological structure(fault),and other factors,the performance of deep the basic stress field under complex geological conditions is symmetric distribution,basic is made up of both ends to the middle scope expanding,regional stress field and build km deep well thick coal scam grading standards.An evaluation mechanism based on the risk of deep surface mining is formed to obtain the key factors of rock burst pressure inducing in different stress zones of coal seam with extra thick impact of 1000 km deep well,including the buried depth in geological factors,roof and floor strata,as well as the mining area layout and mining methods in stoping factorsThrough the analysis of roadway driving along goaf tang mouth coal mining face 6304 big-small structural mechanics characteristics,the key factors of different regional stress field of big and small structural stability mechanism of revealed based on the long-term stability of surrounding rock of roadway driving along goaf deep big-small structure main control factors,put forward accord with the actual situation of tang mouth coal km deep well along goaf roadway surrounding rock stress optimization technique,and combined with factors such as stress field distribution,disaster prevention,tang mouth coal mining working face eventually determine the most appropriate width of coal pillar is 7 mBased on the analysis of 6304 surface of tangkou,the failure mechanism of surrounding rock along the roadway of strong impact deep well is put forward,and the main technical factors affecting the deformation and failure of surrounding rock are also given.According to the influence factors of surrounding rock deformation,the corresponding control means and recommended support parameters are given.On this basis,the reasonable support means in different areas and different periods of the roadway are selected,and a variety of support schemes are put forward.Then the optimal support scheme is obtained by calculation based on engineering analogy and empirical formula.Through this study,the induced factors and reasonable sizes of coal pillars in tangkou coal industry are finally determined,which will play a positive role in the future mine safety production,disaster prevention and control,and improve economic benefits,and provide reference significance for the production and construction of similar mines in the future...