top coal caving mining method

Top-coal caving mining involves the processes ofintact top-coalfracturing, crushing and drawing. The particle element with an initial strength can well simulate the processes of top-coal breaking and moving. The block element can accurately analyze the force and deformation of …

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  • Longwall Top Coal Caving,Top Coal Caving,Top Coal Caving

    Longwall Top Coal Caving,Top Coal Caving,Top Coal Caving

    Longwall Top Coal Caving (LTCC) isa special designed longwall mining methodfor very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.

  • Longwall Top Coal Caving (LTCC) Mining Technology

    Longwall Top Coal Caving (LTCC) Mining Technology

    Longwall Top Coal Caving (LTCC) isa special designed longwall mining methodfor very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.

  • 3D numerical modeling of longwall mining with top coal caving

    3D numerical modeling of longwall mining with top coal caving

    In China, the reserve and production of thick seam coals accounts for 45% of underground coal resources and production, and the longwalltop-coal cavingtechnique (LTCC) is one of the major mining methods used toextract thick coalseams.1–3The technique was first applied in the 1940s in Russia and subsequently used in France, former Yugoslavia, Hungary, Romania, former Czechoslovakia, Turkey …

  • Longwall Top Coal Caving,Top Coal Caving,Top Coal Caving

    Longwall Top Coal Caving,Top Coal Caving,Top Coal Caving

    Longwall Top Coal Caving (LTCC) is a special designed longwallmining methodfor very thick seams (thickness is more than 4.5m) where good qualitycoalis being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5mminingheight.

  • Longwall Top Coal Caving (LTCC) Mining Technology

    Longwall Top Coal Caving (LTCC) Mining Technology

    Longwall Top Coal Caving (LTCC) is a special designed longwallmining methodfor very thick seams (thickness is more than 4.5m) where good qualitycoalis being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5mminingheight.

  • Study of automatedtop coal cavingin extra thickcoal

    Study of automatedtop coal cavingin extra thickcoal

    Introduction. In China, the reserve and production of thick seam coals accounts for 45% of undergroundcoalresources and production, and the longwalltop-coal cavingtechnique (LTCC) is one of the majormining methodsused to extract thickcoalseams.1, 2, 3 The technique was first applied in the 1940s in Russia and subsequently used in France, former Yugoslavia, Hungary, Romania, former ...

  • Cavingmechanisms of loosetop coalin longwalltop coal

    Cavingmechanisms of loosetop coalin longwalltop coal

    Oct 01, 2014· Thetop-coal cavinglongwallminingis one of the majormining methodsfor extracting thickcoalseams in China. Thetop-coal caving miningwas estimated to have produced about 0.6 billion metric tons every year, accounts for 18% of undergroundcoal miningin China .The major features of thetop-coal caving miningare that a conventional longwallminingwith cutting height 2–3 m is performed ...

  • Top CoalMovement Law of Dynamic GroupCaving Methodin

    Top CoalMovement Law of Dynamic GroupCaving Methodin

    Due to the unbalancedtop coaldrawing process, the recovery ratio is low, and the equipment stability is poor in the longwalltop coal caving mining(LTCC) with an inclined seam. Aimed at these problems, this paper proposes the dynamic groupcaving method(DGCM). The basic procedure is that when the drawn volume oftop coalfrom a support reaches about half, the next support begins drawing ...

  • 3D numerical modeling of longwall mining with top coal caving

    3D numerical modeling of longwall mining with top coal caving

    Feb 01, 2005·Coalhas been produced by means of longwall retreat with thetop-coal-cavingproductionmethodwhere a 2.8 m high longwall face was operated at the floor of thecoalseam .Top-slicecoalhaving a thickness of 5.2 m was caved and produced through windows located at thetopof the shields.

  • Numerical Investigation ofTop CoalDrawing Evolution in

    Numerical Investigation ofTop CoalDrawing Evolution in

    Downloadable! In longwalltop coal caving(LTCC), the resource recovery ratio of the working face is directly determined by thetop coalrecovery ratio. An investigation of the evolution oftop coaldrawing characteristics and revealing the evolution oftop coaldrawing parameters is necessary when providing guidance forcavingparameter selection and improving thetop coalrecovery ratio.

  • Longwall Top Coal Caving (LTCC) technology Yancoal

    Longwall Top Coal Caving (LTCC) technology Yancoal

    Yancoal introduced theLongwall Top Coal Caving (LTCC)miningtechnology to Australia at its Austar mine in 2006. Developed in China,top coal cavinguses a modified long wallminingsystem. LTCC allows the excavation of thickcoalseams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for ...

  • Experimental investigation on the movement mechanism of

    Experimental investigation on the movement mechanism of

    This paper explores thecoalmovement mechanism in thetop coalwith pre-blasting zones based on the geological parameters of Jiangcang No. 1 mine in the western of China. The steeply inclined ultra-thickcoalseam was mined by using the subleveltop-coal caving mining method. The geo-image process system (GIPS) software was used to track the ...

  • Top Coal Caving Longwall undergroundCOAL

    Top Coal Caving Longwall undergroundCOAL

    A brief description oflongwall top coal caving(LTCC) is included at the end of the Longwall section of the Fundamentals ofCoal Miningmodule of this web site. Despite the fact that there are numerouscoalseams in Australia which are thick enough for LTCC to be used to increase recoveries, potentially at a reduced cost/tonne, there has been ...

  • Typesof Underground Mining Method Comparison

    Typesof Underground Mining Method Comparison

    Table of ContentsFactors Affecting Choice of MethodReview of Stoping MethodsUnderhand StopingMiningMethodOverhand Stoping MethodLongitudinal Back, Flat-BackMiningMethodLong-Wall StopingmMining MethodRill-Cut Stoping MiningSaw-Tooth Back StopingShrinkage StopingMining by Combination StopingSide StopingBreast StopingSublevel StopingSquare-Set StopingFilling MethodsCavingMethods…

  • Long wall top coal caving SlideShare

    Long wall top coal caving SlideShare

    Nov 15, 2017·Long wall top coal caving1.LONGWALL TOP COAL CAVINGP SHASHIKANTH 16MT001042 2.LONGWALL TOP COAL CAVINGGENERAL INFORMATION • It is the modifiedmethodof longwallminingsystem • Yancoal introduced theLongwall Top Coal Caving(LTCC)miningtechnology in Australia at its Austar mine in 2006.

  • Numerical modeling of longwalltop coal caving methodat

    Numerical modeling of longwalltop coal caving methodat

    The preferredmining methodfor these thickcoalseams is the LongwallTop Coal Caving(LTCC). The connection of both thetop coal cavingand its compactness are still rare; therefore, the capability oftop coal cavingmechanism is the most significant factor in …

  • Mining safety of longwall top coal caving inChina

    Mining safety of longwall top coal caving inChina

    @article{osti_20020940, title = {Mining safety of longwall top-coal caving inChina}, author = {Wu, J and Qin, Y and Zhai, M}, abstractNote = {Longwalltop-coal cavingtechnology has developed rapidly in China, in recent years. The applicationof longwall top-coal cavingcan double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 50%.

  • Top CoalMovement Law of Dynamic GroupCaving Methodin

    Top CoalMovement Law of Dynamic GroupCaving Methodin

    Due to the unbalancedtop coaldrawing process, the recovery ratio is low, and the equipment stability is poor in the longwalltop coal caving mining(LTCC) with an inclined seam. Aimed at these problems, this paper proposes the dynamic groupcaving method(DGCM). The basic procedure is that when the drawn volume oftop coalfrom a support reaches about half, the next support begins drawing ...

  • Longwall Top Coal Caving Method SlideShare

    Longwall Top Coal Caving Method SlideShare

    Feb 19, 2014· LTCC • LongwallTop coal Caving(LTCC) is amethodof extraction for undergroundminingof thick seams. • It uses a longwall set-up and natural forces to aid in the winning ofcoal. 4.

  • Numerical modeling of longwall top coal caving methodat

    Numerical modeling of longwall top coal caving methodat

    Thetop-coal caving mining method, developed steadily in the past two decades, has become the mainmethodfor thick seamcoal miningin China. In recent years, the core research areas in thetop...

  • Systems of Mining ore,coal, slicing,caving,method

    Systems of Mining ore,coal, slicing,caving,method

    Systems of Miningore,coal, slicing,caving,method,top, system, explosives, pillars and cent ... The principal difference is that a single slice only is worked in thesemethodswhen applied tocoal mining. There are two modifications:topslicing by drifts andtopslicing by rooms.

  • Numerical Investigation ofTop CoalDrawing Evolution in

    Numerical Investigation ofTop CoalDrawing Evolution in

    Downloadable! In longwalltop coal caving(LTCC), the resource recovery ratio of the working face is directly determined by thetop coalrecovery ratio. An investigation of the evolution oftop coaldrawing characteristics and revealing the evolution oftop coaldrawing parameters is necessary when providing guidance forcavingparameter selection and improving thetop coalrecovery ratio.

  • Longwall Top Coal Caving Mechanisms in the Fractured Thick

    Longwall Top Coal Caving Mechanisms in the Fractured Thick

    Aug 08, 2020· In this study, the finite differencemethod(FDM) coupled with a discrete fracture network (DFN) was utilized to analyze longwalltop coal caving(LTCC) behaviors. The integrated FDM–DFN model enabled the influence of the preexisting fracture, stress redistribution, stress rotation,cavingmaterial compaction, and periodic rupture of roof ...

  • Numerical Analysis ofTop CoalRecovery Ratio by using

    Numerical Analysis ofTop CoalRecovery Ratio by using

    Cavingmechanisms of loosetop-coalin longwalltop-coal caving mining method. International Journal of Rock Mechanics andMiningSciences, 71, 160-170. …

  • A Brief Comparison of LongwallMethodsUsed atMiningof

    A Brief Comparison of LongwallMethodsUsed atMiningof

    There exist several differentmethodsin Turkey and in the world to operate longwalls of thickcoalseams in underground mines. The most important ones are Single Pass Longwall (SPL), Multi-Slice Longwall (MSL), and LongwallTop Coal Caving(LTCC). In this paper thesemethodsare compared to eachother both from the technical and economical perspectives.

  • Stress analysis of longwall top coal caving Request PDF

    Stress analysis of longwall top coal caving Request PDF

    The longwalltop coal caving(LTCC) is an efficientmining methodto specifically extract thick or ultra-thickcoalseams due to its good adaptability with respect to the large variations ofcoal...

  • Characterizing the Top Coal Cavabilitywith Hard Stone

    Characterizing the Top Coal Cavabilitywith Hard Stone

    Aug 20, 2018· One of the most challenging problems in longwalltop coal cavingis thetop coalcavability. Stone bands, which are usually found in thickcoalseams, have shown adverse effects ontop coalfragmentation and cavability. Understanding the characteristics of the stone bandcavingprocess is a primary step in evaluatingtop coalcavability in such conditions.

  • Block caving A new mining method arises

    Block caving A new mining method arises

    Jul 25, 2018· Blockcavingis a new alternativemethodof developing new mines or extending the operation of open pits. Blockcavingis an underground hard rockmining methodthat involves undermining an ore body, allowing it to progressively collapse under its own weight. It is the underground version of open pitmining.

  • Experimental and numerical investigation on coal drawing

    Experimental and numerical investigation on coal drawing

    Steepcoalseamminingactivities will frequently occur during the next few decades in China. In this study, both experimental and numericalmethodsare employed to investigate thecoaldrawing from thick steep seam with longwalltop coal caving mining. A series of analyses is performed to investigate the features of the drawing body, the distribution oftop coalrecovery ratio and the shape ...

  • top coal caving mining methodin ukraine

    top coal caving mining methodin ukraine

    top coal caving mining methodin ukraine;top coal caving mining methodin ukraine. Feb 14 2020 · Blockcavinghas emerged as a costeffectivemethodofmininglarge lowgrade mineral deposits More than half of the country’scoalmines are managed by proRussian separatist militia Credit DmyToShutterstock...We are a professionalmining...

  • (PDF) Research onTop Coal Caving Technique in Steep and

    (PDF) Research onTop Coal Caving Technique in Steep and

    As a givencoal mining method, mechanized SSTCC, a particular kind oftop coal caving(Xie and Zhao 2009), provides a powerfulmethodto extract ESTCS in such a complicated underground circumstance.

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