Study On Comprehensive Control Technology Of Gas In Ⅱ832 Working Face Of Zhuxianzhuang Coal Mine

The Zhuxianzhuang coal mine in Sudong mining area is a coal and gas outburst mine.The mine has the characteristics of large coal seam depth and high gas content.The gas storage characteristics of different areas within the minefield are quite different.This article is based on the specific mine Geological conditions,using a combination of theoretical analysis + numerical simulation + on-site engineering practice,to conduct research on coal and gas outburst mine gas treatment mode and treatment plan,and obtained some instructive conclusions.Based on the classification results of mine 8# and 10# coal seams with outburst danger areas and non-outburst danger areas,combined with the selection principle of gas drainage methods,the overall plan of mine gas drainage is formulated,and the gas control target is determined as the regional outburst-eliminating coal seam.The residual gas content is reduced to below 4m3/t,and the residual gas pressure is reduced to below 0.4MPa;the gas concentration in the return air flow of the mining face is controlled below 0.3%.Through theoretical analysis of the overlying rock movement law of the working face,the distribution law of mining fissure field and the overburden pressure relief effect of the protective layer mining,the overlying rock movement law of the protective layer mining is grasped,and the ABAQUS numerical simulation software is further used for 10# coal seam as 8# The simulation analysis of the feasibility of mining under the protective layer of the coal seam.Through the analysis of the vertical stress of the surrounding rock,the vertical displacement and the expansion rate of the overlying rock,it is concluded that the mining of 10# coal seam as the 8# coal seam protective layer is feasible.#The purpose of coal seam pressure relief gas drainage.Based on the analysis results of the comprehensive plan of gas drainage and the feasibility of mining the protective layer,according to the characteristics of the 8# coal seam outburst danger zone and the non-outburst danger zone,the design and design of the 8# coal seam non-outburst danger zone area gas treatment method is: bedding drilling + High-level drilling + Laotang buried pipe drainage;8# coal mining area with protective layer adopts pressure relief gas pre-drainage method,and mining area without protective layer adopts large-area pre-drainage area gas control mode.10# coal seam non-outburst danger zone gas extraction method: bedding drilling + high drilling + old pond buried pipe combined extraction method;10# coal outburst risk area adopts a large area pre-drainage area gas control method to relieve pressure Gas pre-drainage method: combined drainage of grid-type dense through-layer drilling + working face bedding drilling + high-location drilling + Laotang buried pipe.According to the gas treatment model and treatment plan,with the II832 working face gas drainage as the engineering background,combined with the 8# coal seam outburst danger area gas treatment plan,the design of the gas drainage plan is: mining protective layer + grid pattern upward through-bed drilling + Ground drilling +high-level interlayer interception drilling + small-curvature comb-shaped long drilling+ high-level drilling + Laotang buried pipe combined drainage.According to the test data during the gas drainage of the protective layer and the protected layer and the mining of the working face,it can be seen that the gas treatment effect is significant and the safe mining of the working face is guaranteed.Figure [39] Table [4] Reference [80]...