coal pillar layout

Roadway layout for recycling residual coal pillar in room The coal seam has simple framework, and its thickness ranges between 306 and 502 m, with an average t

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coal pillar layout

  • Roadway layout for recycling residual coal pillar in room

    The coal seam has simple framework, and its thickness ranges between 306 and 502 m, with an average thickness of 423 m and the partings no more than 2 layers This coal layer is recognized as a thick and stable minable seam The layoutThe layout of UCM provides dynamic geological security for ADP The sequences of working faces can be obtained from the mining plan, then we can know key mining areas to optimize the layout of ADP and UCM Technical mode 1, UCM fully considers ADP, such as coal pillar, striping mining, and filling mining (Gray, 1990; Showstack, 2009)Optimal layout of underground coal mining with groundThe 8m small coal pillar and 6m small coal pillar are reserved, so the roof damage depth is small, so it is more conducive to roof maintenance than other schemes Considering the actual production problems such as air leakage in the working face, it is suggested that the 8m coal pillar should be reserved for drivingStudy on optimum layout of roadway in close coal seam

  • EVALUATION OF UNDERGROUND COAL PILLAR DESIGN

    21 Cross section of typical Bord and Pillar layout 6 22 The Tributary area pillar loading concept 9 23 The pressure arch theory 11 24 Concept of local stiffness and conditions for stable and unstable failure 13 25 Postfailure characteristics of sandwich yield pillars 131Pillar design in coal mines by H WAGNER*, D Eng (Member) SYNOPSIS The paper points out that bordandpillar mining is the most important method of coal extraction in South Af~ican underground coal mines, and advocates that pillar design procedures should be refined to make more rationalPillar design in coal mines JournalsTASMAN PARTIAL PILLAR EXTRACTION DESIGN Layout of pillar extraction panels was undertaken by re ferencing the relevant legislation and mine design guidelines The general principles outlined in MDG 1005 Manual on Pillar Extraction in NSW Underground Coal Mines (NSW Dept Primary Industries, 1992) were followed as the mine layout andUniversity of Wollongong Research Online

  • 活鸡兔井极近距离煤层煤柱下双巷布置研究

    Key words: ultraclose coal seams, section coal pillar, doubleroadway layout, shallow coal seam 引用本文 陈苏社,朱卫兵 活鸡兔井极近距离煤层煤柱下双巷布置研究[J] 采矿与安全工程学报, 2016, 33(3): 467474 CHEN Sushe,ZHU Weibing Study onThe coal pillar in the lower section is almost not affected by the stress of the coal pillar in the upper section, and the coal pillar is stable, but a considerable amount of coal is lost The staggered distance of the coal pillar falls in the rock shear fracture surface and the passive compressive stress area (zone II)Optimization of staggered distance of coal pillars inlayout for recycling residual coal pillar in roomandpillar mining of thick coal seam ,International Journal of Mining Science and Technology,2015,25 ( 5 ):729734 ( EI 收录) (6) Uniaxial strength and failurein sandstone containing a pre王连国力学与土木工程学院

  • SimulationResearchfortheInfluenceofMiningSequenceonCoal

    The coal pillar stress of skip mining is σ2 = γHðÞ3BP +BZ BL 3BP ⋅BL =γH 1+ BZ 3BP, ð2Þ where BP is the width of coal pillar, BZ is the width of borehole, BL is the depth of borehole, and γ is the average bulk weight of overlying strata It is derived from theoretical formulas σ2 <σ1 The stress of skipping coal pillar is lessPillar design in coal mines by H WAGNER*, D Eng (Member) SYNOPSIS The paper points out that bordandpillar mining is the most important method of coal extraction in South Af~ican underground coal mines, and advocates that pillar design procedures should be refined to make more rationalPillar design in coal mines Journals21 Cross section of typical Bord and Pillar layout 6 22 The Tributary area pillar loading concept 9 23 The pressure arch theory 11 24 Concept of local stiffness and conditions for stable and unstable failure 13 25 Postfailure characteristics of sandwich yield pillars 14EVALUATION OF UNDERGROUND COAL PILLAR DESIGN

  • Reasonable coal pillar design and remote control mining

    1 Introduction The slope angle, mining boundary, changes of the coal seam thickness, etc are the main reasons that many coal resources remain under the endwalls in openpit coal mines [1–3]Because of the undeveloped miningCoal Pillar Design Like many other structural design problems, coal pillar design can be expressed as a factor of safety Estimating stress on a coal pillar can be relatively straightforward, but the method for determining coal pillar strength is not as well established The roomandpillar layout was assumed to consist of 40ft squareProbabilistic Approach to Coal Pillar Design | Coal AgeThe method used is the room and pillar mining method where the initial entry galleries are driven into the coal seam starting from the surface excavation face,(PDF) Room and Pillar Design and Construction for

  • Investigation of the Optimal Layout of the Roadway in

    The layout of the return air roadway in the 30503 working face of the coal pillar under the 3–5# coal seam remaining from the 2# coal seam of Tashan Coal Mine was optimized The main conclusions can be drawn as follows: (1) The results of drilling and deformation data show that the subsidence of the roof is characterized by rapid deformationTASMAN PARTIAL PILLAR EXTRACTION DESIGN Layout of pillar extraction panels was undertaken by re ferencing the relevant legislation and mine design guidelines The general principles outlined in MDG 1005 Manual on Pillar Extraction in NSW Underground Coal Mines (NSW Dept Primary Industries, 1992) were followed as the mine layout andUniversity of Wollongong Research OnlineDuring coalpillar extraction, there is a continuous redistribution of stress above the remaining pillars The increase and the layout of the panel was nonsymmetrical Along the south side of the panel, where there was no barrier pillar, previously extracted longwall panels had goafed Along the north sideAnalysis coal pillar extraction

  • SimulationResearchfortheInfluenceofMiningSequenceonCoal

    The coal pillar stress of skip mining is σ2 = γHðÞ3BP +BZ BL 3BP ⋅BL =γH 1+ BZ 3BP, ð2Þ where BP is the width of coal pillar, BZ is the width of borehole, BL is the depth of borehole, and γ is the average bulk weight of overlying strata It is derived from theoretical formulas σ2 <σ1 The stress of skipping coal pillar is lesslayout for recycling residual coal pillar in roomandpillar mining of thick coal seam ,International Journal of Mining Science and Technology,2015,25 ( 5 ):729734 ( EI 收录) (6) Uniaxial strength and failurein sandstone containing a pre王连国力学与土木工程学院Pillar design in coal mines by H WAGNER*, D Eng (Member) SYNOPSIS The paper points out that bordandpillar mining is the most important method of coal extraction in South Af~ican underground coal mines, and advocates that pillar design procedures should be refined to make more rationalPillar design in coal mines Journals

  • Probabilistic Approach to Coal Pillar Design | Coal Age

    Coal Pillar Design Like many other structural design problems, coal pillar design can be expressed as a factor of safety Estimating stress on a coal pillar can be relatively straightforward, but the method for determining coal pillar strength is not as well established The roomandpillar layout was assumed to consist of 40ft squarereinforcing coal pillar design representation, the horizontal stress acting within the overburden, the competence of the overburden in terms of its selfsupporting ability across the panel, and the panel width are all brought into the problem representation implications on bord and pillar layout design involving coal pillarsCoal Pillar Design When Considered a Reinforcementretained coal pillars, and a reasonable pillar width ensures the safety of mining and increases the recovery ratio Thus, the reasonable coal pillar design and remote control technology for the HWM technology were studied in this paper 3 Reasonable coal pillar design to prevent rock fall accidents 31 Numerical simulation 311Reasonable coal pillar design and remote control mining

  • A Methodology For Designing Pillar Layouts For Shallow

    The goal of the present paper is to attempt to synthesize, necessarily briefly, a workable methodology for pillar layout analysis and design Methods for estimating relevant In situ pillar characteristics for hard rock as well as Coal environments are first reviewed, and pillar design principles and criteria are summarizedThe roadway layout should avoid the areas below the coal pillar and the coal pillar edge with high stress level and large stress variation gradient Formation of high stress concentration on coal pillar and transfer to lower layered coal and floor strata, and decrease of stress concentration layer by layerCharacteristics of Stress Field and Damage Law of CoalDuring coalpillar extraction, there is a continuous redistribution of stress above the remaining pillars The increase and the layout of the panel was nonsymmetrical Along the south side of the panel, where there was no barrier pillar, previously extracted longwall panels had goafed Along the north sideAnalysis coal pillar extraction

  • Structure Partition and Reasonable Width Determination

    Retaining a waterproof coal pillar is the most effective water conservation method for a roadway close to the gob, and determining a reasonable width of the waterproof coal pillar has been a common problem among mining scholars for a considerably long time The longwall face layout is shown in Figure 2(b) The 15028 tailgate (width 52 mUpdate of coal pillar database for South African coal mining by JN van der Merwe*, and M Mathey†* Synopsis Following the Coalbrook disaster in 1960, research into coal pillar strength resulted in the adoption of the concept of a safety factor for the design of stable pillars in South African coal miningUpdate of coal pillar database for South African coalCoal pillar fragmentation caused by mining stress will cause multiple goafs in series on the isolated island's small coal pillar working face Due to the unclear rule of air leakage in the minedout area and coal pillar, once the spontaneous combustion occurs, it will threaten the safety of the mine, causing a large no of Waste of resourcesDistribution Characteristic and Migration Mechanism of

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