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Buffer Inclination Multi-seam Mining Under The Protective Layer Design Of Pressure Relief Gas Drainage

Posted on:2012-10-25Degree:MasterType:Thesis
Country:ChinaCandidate:Z H HuangFull Text:PDF
GTID:2131330338497965Subject:Safety Technology and Engineering
Abstract/Summary:PDF Full Text Request
Based on NaTong coal appropraite mining coal mining under more protective layer as the research object, by protective mining area to determine the industrial test, working the gas pressure changes after mining law;this basis, combined with the reality of the situation protective established limited deformation of coal and rock solid gas dynamic coupling model, and obtain the protective mining pressure relief gas drainage drilling based data optimization;Through the analysis of the protective layer of coal mining under more coal rock discharging pressure characteristics and discharging pressure gas flow pattern, combining with the industrial test, based on the "protective mining roof-floor increase through effect" on its pressure relief gas drainage parameters have been optimized, given how NaTong coal mine appropraite mining under the protective layer coal seam gas extraction pressure relief the optimal design parameters, and proved its superiority. To sum up, this paper main research results and conclusions are as follows:â‘ Through investigation to be protective drilling gas power parameters change regulation industrial test, analysis with the protective work get forward, gas pressure can be divided into normal pressure belt, pressure concentration belt, transition changes take and fully discharging pressure belt. Meanwhile, tested the protective layer get original coal gas pressure K4 for 3.1 Mp.â‘¡With the protective mining pressure relief gas flow theory as a foundation, established considering the porosity and low permeability coal seam permeability under the dynamic changes of protective mining coal more solid gas dynamic coupling model; through the model analysis, obtained after mining under cover of the stress distribution law by protective protective layer of protection and pressure relief gas drainage drilling surrounding gas pressure, porosity and permeability of the influence law.â‘¢Based on appropraite mining coal after more than under the protective layer by protective roof-floor regularity and on-site industrial test pressure relief gas dynamic parameters of the "four belt" changes, determines the protection scope of the pressure relief gas by relevant extraction parameter.â‘£In this scene industrial test and based on the 3-d numerical simulation, based on the basis of the protective mining "pressure relief increase through effect", through the analysis of the protective layer of coal mining under more pressure relief rock fell on moving characteristics and discharging pressure gas migration rule, obtained the appropriate test area of discharging pressure gas extraction, the optimal design parameters of the actual application effect monitoring.Monitoring results show that, using this design discharging pressure gas extraction optimization layout parameters pressure relief gas to average extraction rate reached 43%.
Keywords/Search Tags:More gently inclined seam, under the protective layer, gas pressure, pressure relief gas drainage
PDF Full Text Request
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