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Method for designing the optimal sealing depth in methane drainage boreholes to realize efficient drainage

International Journal of Coal Science & Technology 2021年第6期8卷 1400-1410页

作者： Minghao Yi Liang Wang Congmeng Hao Qingquan Liu Zhenyang Wang Key Laboratory of Coal methane and Fire Control Ministry of EducationChina University of Mining and TechnologyXuzhou 221116JiangsuChina National Engineering Research Center for Coal Gas Control China University of Mining and TechnologyXuzhou 221116JiangsuChina School of Safety Engineering China University of Mining and TechnologyXuzhou 221116JiangsuChina

The purpose of underground methane drainage technology is to prevent methane disasters and enable the efficient use of coal mine methane(CMM),and the sealing depth is a key factor that affects the performance of underground methane *** this work,the layouts of in-seam and crossing boreholes are considered to analyze the stress distribution and failure characteristics of roadway surrounding rock through a numerical simulation and field stress investigation to determine a reasonable sealing *** results show that the depths of the plastic and elastic zones in two experimental coal mines are 16 and 20 m *** sealing minimizes the air leakage through the fractures around the roadway when the sealing material covers the failure and plastic zones,and the field test results for CMM drainage at different sealing depths indicate that the CMM drainage efficiency increases with increasing sealing depth but does not change once the sealing depth exceeds the plastic ***,sealing in the high-permeability roadway surrounding rock does not have a strong influence on the borehole sealing *** these findings,a new CMM drainage system for key sealing in the low-permeability zone was developed that is effective for improving the CMM drainage efficiency and prolonging the high-concentration CMM drainage *** proposed approach offers a valuable quantitative analysis method for selecting the optimum sealing parameters for underground methane drainage,thereby improving considerably the drainage and utilization rates of CMM.

关键词： Coal mine methane methane drainage Borehole sealing Mining safety methane utilization

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The Effectiveness of the methane drainage of the Rock-Mass with a Parallel Ventilation Heading during Longwall Mining

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Journal of Energy and Power Engineering 2014年第11期8卷 1876-1888页

作者： Nikodem Szlazak Marek Borowski Justyna Swolkien Department of Underground Mining A GH University of Science and Technology Cracow 30 30-059 Poland

methane drainage is used in Polish coal mines in order to reduce mine methane emission as well as to keep methane concentration in mine workings at safe levels. This article describes the method of methane drainage used in longwall 2 in seam 506. In Poland, coal seams are frequently mined in difficult conditions of very high methane hazard. Under such situations, methane is drained by means of parallel ventilation headings. This paper shows the influence of a specific ventilation system on the drainage efficiency at longwall 2 in seam 506. At this longwall, measurements of methane emission and the efficiency of drained methane were conducted. They consisted in gauging methane concentration, air velocity, absolute air pressure and the amount of methane removed via a drainage system. Experimental data were used to estimate the variations in absolute methane-bearing capacity, ventilation air methane and most importantly, to gauge the efficiency of methane drainage.

关键词： methane hazard methane drainage ventilation system effectiveness of methane drainage.

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Study on the law of methane seepage in the wall of drainage roadway in mining seam-group

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Journal of Coal Science & Engineering(China) 2005年第2期11卷 64-66页

作者：刘健罗勇刘泽功石必明 Department of Resources Exploitation and Management Engineering Department of Modern Mechanics University of Science and Technology of China Hefei 230026China

Based on the equation of the gas flow continuity and state, Darcy law and Langmuir equation, the law of methane seepage in the wall of drainage roadway was studied. The governing equation of methane one-way seepage in the seam was founded. By solving the equation, the calculation of methane seepage velocity in the coal wall was worked out. The result has really applied worth and will give beneficial references to re-lated research, it provides preventing coal and gas outbursts with theoretical gist.

关键词： drainage roadway methane seepage governing equation methane drainage

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A Numerical Investigation of the Stress Relief Zones Around a Longwall Face in the Lower Seam for Gas drainage Considerations

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Computer Modeling in Engineering & Sciences 2021年第4期127卷 135-157页

作者： Chunlei Zhang YPChugh Ruimin Feng Yong Zhang Wei Shen Jingke Wu Yushun Yang Faculty of Architecture and Civil Engineering Huaiyin Institute of TechnologyHuai’an223001China Mining and Mineral Resources Engineering Southern Illinois UniversityCarbondaleIllinois62901USA School of Mechanics and Civil Engineering China University of Mining&Technology(Beijing)Beijing100083China Department of Civil Engineering University of ArkansasFayettevilleAR 72701USA School of Energy and Mining Engineering China University of Mining&Technology(Beijing)Beijing100083China

Extraction of a protective coal seam (PVCS)-below or above a coal seam to be mined with the potential of coal andgas outburst risk-plays an important role not only in decreasing the stress field in the surrounding rock mass but alsoin increasing the gas desorption capacity and gas flow permeability in the protected coal seam (PTCS). The PVCSis mined to guarantee the safe mining of the PTCS. This study has numerically evaluated the stress redistributioneffects using FLAC3D model for a longwall face in Shanxi Province. The effects of mining depth, mining height andinter-burden rock mass properties were evaluated using the stress relief angle and stress relief coefficient. Verticalstress distribution, stress relief angle and stress relief coefficient in the PTCS were analyzed as the face advancedin the PVCS. The results showed that the stress relief achieved in different locations of the PTCS varied as the faceadvanced. Sensitivity analyses on the pertinent variables indicate that the stress relief in the PTCS is affected mostby the mining depth followed by the inter-burden lithology and the mining height. Furthermore, the elastic moduliof different layers within the inter-burden rock mass are more important than their uniaxial compressive strength(UCS) and Poisson’s ratio. These observations can guide gas drainage borehole design to minimize the accidentsof coal and gas outbursts.

关键词： methane drainage longwall mining protective/protected coal seam multiple seams FLAC3D software stress relief zones

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Current situation of simultaneous coal and methane extraction tech- nology in pressure-relieved coalbed group

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Journal of Coal Science & Engineering(China) 2013年第4期19卷 500-506页

作者： Feng CAI Ze-Gong LIU Yi LUO School of Resource and Safety Anhui University of Science and Technology Huainan 232001 China Key Laboratory of High Efficiency Coal Exploitation and Gas Extraction of Anhui Province Huainan 232001 China Key Laboratory of Integrated Coal Exploitation and Gas Extraction of Anhui Province Huainan 232001 China Department of Mining Engineering West Virginia University Morgantown 26505 USA

The importance of simultaneous coal and methane extraction and its significance on green exploitation is stated, and current research situation of simultaneous coal and methane and faced new problems are introduced. The research progress on movement of overlying strata and stresses change in them, cracks development during mining in overlying strata and meth- ane emission under disturbance of mining as well as the changing rules of permeability and methane flow under the disturbance of mining is analyzed. The progress on practice of simultaneous coal and methane extraction is analyzed. The deficiencies of current research and further researching fields on simultaneous coal and methane extraction are pointed out.

关键词： simultaneous coal and methane extraction pressure-relieved methane coalbed methane methane drainage

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Applicability of surface directional wells for upper Silesia Basin coal seams' drainage ahead of mining

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International Journal of Mining Science and Technology 2014年第3期24卷 353-362页

作者： Jura Bartlomiej Skiba Jacek Wierzbinski Krystian Central Mining Institute Katowice

Methods of exploitation drainage, which is presently applied in polish hard coal mines in Upper Silesian Coal Basin(Poland), are not effective enough, high risk of methane hazard can be observed, and production capacity of the mining plant is not fully used. methane hazard, which may occur during planned coal exploitation, is presented in this paper. Following parameters are taken into consideration in the forecasts: coal extraction parameters, geological and mining conditions, deposit's methane saturation degree and impact of coal exploitation on the degasification coefficient of the seams, which are under the influence of relaxation zone. This paper presents the results of the analysis aiming to verify applicability of drainage ahead of mining of the coal seams by using surface directional wells. Based on the collected data(coal seams' structural maps, profiles of the exploratory wells, geological cross-sections), the lab tests of drilling cores and direct wells' tests, static model of the deposit was constructed and suitable grid of directional wells from the surface was designed. Comparison of forecasted methane emission volume between the two methods is investigated. The results indicated the necessity of performing appropriate deposit's stimulations in order to increase effectiveness of drainage ahead of mining.

关键词： Coal methane drainage methane hazard forecasting Numerical modeling Deposit simulation

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