Experimental Study Of Pore Structure Characteristics Of Full-aperture Section Of Middle And Low Rank Coal In Xinjiang Mining Area

As the necessary passage of coal mining,the smooth and stable roadway is the guarantee of safe and efficient coal mining.Due to the complexity of surrounding rock conditions and the limitation of supporting scheme selection,many coal mines have some unreasonable supporting schemes.Guo home bay in many mining area coal mine 51103 mining face roadway as the research object,through field investigation,laboratory test and theoretical analysis and numerical simulation method,according to the selection of different bolt material,put forward two sets of roadway support optimization scheme,by contrast to choose the best optimization support scheme,the final on-site monitoring,verify the rationality of the optimization as well as the deformation of surrounding rock of the roadway.This paper mainly studies the following contents:(1)through field research,collection and analysis of geological data,understand the specijfic occurrence characteristics of no.5 coal seam and the section characteristics of mining roadway,and test the physical and mechanical parameters of coal seam,roof and floor in the laboratory.(2)according to the loose ring test and drilling peep results,combined with the actual situation of the roadway,test and analyze the loose ring range of the roof of 51103 working face and the surrounding rock of the roadway and determine that the support of the roadway should be strengthened.(3)two sets of roadway optimization support schemes were developed according to different bolt materials.Conclusion by comparing guo wan optimization scheme of coal mining area,roof bolt use ? 18 x 1800 mm sinistral without longitudinal reinforcement anchoring bolt,between row spacing is 1200 x 1200 mm,the coal wall anchor used ? 16 x 1700 mm of glass fiber reinforced plastic anchor rod,between row spacing is 1200 x 1200 mm,bolt use coal pillar ? 16 x 1700 mm sinistral without longitudinal reinforcement anchoring bolt,between row spacing is 1200 x 1200 mm.(4)on-site monitoring results show that,in the process of stoping,when the distance is less than 20m,the roof begins to subsidence.In the process of stoping,the maximum separation layer of the roadway roof is 4mm,which indicates that the roadway deformation and failure amount is very small after the use of the optimization plan,which has a good support effect and can meet the support conditions of the roadway.(5)compared with the original support plan,the optimized support design of left-handed longitudinal rib reduces the support intensity of roadway,and makes full use of the bearing capacity of surrounding rock,making the support more economical and reasonableResearch of this paper is to some extent,can solve the problem of excessive support of roadway of 51103 working face,coal seam 5 support provides a more accurate solution,determined by theoretical analysis,numerical simulation of 51103 face roadway two help strengthen support to ensure the overall stability of roadway,the subsequent high yield and high efficiency production has important significance for mine,but also for the similar geological conditions of roadway support provides a successful engineering analogy.