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Study on Disposed Methane Drainage Technology of Close-distance Underlying Protective Seam Mining

Author: YanZhi
Tutor: LiShuQing；YeQing
School: Hunan University of Science and Technology
Course: Safety Technology and Engineering
Keywords: Distance seam Under the protective layer Gas drainage Numerical Simulation Database
CLC: TD712.6
Type: Master's thesis
Year: 2011
Downloads: 150
Quote: 1
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Abstract


Research, analysis summarizes the current paper system under the protective layer of Destress range Relieved Gas and pressure relief gas drainage gas migration law and pressure relief gas relief under the protective layer mining conditions seams extraction technology research problem. To solve these problems, combined with the actual mining of gold of good ore 11223 Face theoretical analysis and numerical simulation, software development, field measurement techniques under the protective layer of Destress range, pressure relief gas migration law, gas extraction method choice, as well as comprehensive drainage program and the effect of drainage. The theoretical analysis of the critical layer protective layer mining the overburden undermine law and fissure development law, engineering geological conditions, combined with the Jinjia mine 22 # coal mined protective layer FLAC3D numerical simulation software protection layer mining the overburden The law of vertical displacement and plastic zone distribution law for the numerical simulation of Jinjia Mine protective layer mining the overburden pressure relief range predicted by the simulation results. Mainly on theory and data analysis A Gas sources of the coal seam and goaf gas in adjacent layers to gush goaf gas migration law goaf gas gush to face. Through the face gas concentration scene tests come face gas concentration distribution law indirectly about the exploitation of the protective layer surrounding layers of gas emission, on the face gas concentration distribution; simulated using Fluent goaf gas migration law gas concentration distribution were analyzed and the importance of these laws on the pressure relief gas drainage. Extraction method according to the excavation area, mining area, preparation area, Mined area, other area classification, and screened to a suitable pressure relief gas drainage methods, and summarizes the conditions of the application of these methods, the technical parameters of the existing gas and application examples. ACCESS database and on this basis. NET platform designed to produce gas drainage methods screening system, and by the method of extraction, drainage area, coal seam thickness, drill field position Filtered gas drainage. Raised seams relief gas drainage program design, combined with the Jinjia mine engineering practice Jinjia Mine seams 11223 Face Destress gas drainage program, based on the results of the study, field applications effect detection and 77.04% of the gas pumping rate, the residual gas pressure of 0.36 MPa, 5.19m3 / t of residual gas content test results show that the design is scientific and reasonable to achieve gas drainage requirements.

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CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine atmosphere > Mine Gas > Gas Drainage
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