Study On Surrounding Rock Stability Control Technique Of Roadway Driving Along Goaf In Yangchangwan Coal Mine

Coal-rich,oil-poor,and gas-deficient are the characteristics of China's energy structure.However,with the increase in the intensity of coal resource extraction,shallow resources are almost depleted.As the mining depth increases,it is affected by geostress,tectonic stress,and mining.The stability of surrounding rock in deep mine roadway is also becoming more and more prominent.Thick coal seam resource reserves account for 45% of China's total resource reserves.At present,the mining of thick coal seams mostly adopts the fully mechanized top coal mining technology.In order to improve the coal recovery rate,experts and scholars have proposed the technology of roadway excavation along the gob,the retention of coal pillars and the roadway Support is particularly important.This paper takes the coal pillars and roadway support in the section between the 120210 fully mechanized caving face and the 120209 fully mechanized caving face in Yangchangwan Coal Mine as the engineering background.Through theoretical analysis,numerical simulation and field tests,The determination of the reasonable width of the coal pillars in the section,the roof movement law of the roadway driving along the goaf,the support technology of the roadway driving along the goaf,and the control effects of the coal pillar and roadway support of the roadway driving along the roadway are carried out.The stability control of the surrounding rock of the empty excavation lane has achieved good application results.The main research results include:(1)Based on the geological conditions of the coal seam in Yangchangwan Coal mine,through theoretical analysis and numerical simulation,the development rules of stress,strain and plastic zone of coal pillars in different width sections are analyzed to determine the reasonable size of coal pillars.(2)After the reasonable width of the section pillar is determined,the stress,displacement and plastic zone development law of the roof and two sides of goaf driving are analyzed by numerical simulation method,which provides a theoretical basis for the support design of goaf driving.(3)Based on the above theoretical calculation and numerical simulation analysis,the combined support mode of "simple composite cable truss + single cable + bolt + net + shotcrete" is proposed,the active support mechanism of simple composite cable truss is analyzed,and the roadway support parameters are designed in detail.(4)Select 120210 working face wind tunnel to carry out field industrial test,comprehensively understand the working condition of the support system through ore pressure observation,and then verify or modify the design of the support control system.Based on the specific arrangement of measuring points,standard measurement methods,clear measurement period and statistical analysis of measurement data,the support control effect is verified.The paper includes 34 Figures,7 Tables and 87 References.