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Top coal caving technology

  • Longwall Top Coal Caving (LTCC) Mining Technology

    Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for 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.

  • Analyses on factors influenced top-coal caving of fully

    Reasonable choice of caving top coal caving technology and determine the appropriate parameter is the main measure of improving coal recovery ratio, analysis and solution of these problems in ensuring mine achieve stable yield, high yield, high efficiency, high recovery ratio of main technical means.

  • Behaviors of the Overburden Strata on Extra-Thick Longwall

    Jan 01, 2019· The paper provides a foundational method to determine the shield loadings for the top coal caving longwall face.INTRODUCTIONLongwall top coal caving (LTCC) is a highly productive underground mining technology which has been widely applied to the exploitation of the thick coal seams in China and other countries due to its high efficiency (Ju and

  • Longwall Top Coal Caving (LTCC) technology - Yancoal

    Developed in China, top coal caving uses a modified long wall mining system. LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for an operation.

  • CiteSeerX GEOLOGICAL AND GEOTECHNICAL INFLUENCES ON

    CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): ABSTRACT: Longwall Top Coal Caving (LTCC) is a means of efficiently mining thick (>4.5m) coal seams and is an established technology in China with more than 20 years experience and over 100 faces in operation in a variety of different mining conditions. A CSIRO ACARP funded project has utilised the database of

  • Hydraulic fracturing of hard top coal and roof for

    There are many extra-thick coal seams in China, and the primary mining method is fully mechanized top coal caving (Yasitli and Unver 2005, Huang et al2007, 2011).

  • Theoretical analysis of support stability in large dip

    State Key Laboratory of High-Efficient Mining and Safety of Metal Mines (University of Science and Technology Beijing), Ministry of Education, Beijing, China, 100083 . ABSTRACT . Support stability is one of the problems in mining at large dip angle coal seam s with fully -mechanized top coal caving .

  • The Principle of Longwall Top Coal Caving (LTCC) - YouTube

    Dec 13, 2016 - has extensive experience in the design of roof supports for specific mining conditions. Longwall Top Coal Caving (LTCC) roof supports allow m

  • MODERN MINING TECHNOLOGY FOR COAL EXTRACTION

    1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.

  • Coal Washing Plant,Coal Washery,Coal Washing-Beijing HOT

    Coal Washing Plants consist of several sub-processing modules including raw coal preparation (crushing and screening station), pre- discharge rejects (rom jig, dense medium vessel/bath, rotary breaker), coal feeding and washing module (jigging or dense medium cyclones) as well as a dewatering module, coal handling module (conveyors, train/truck loading station, stacker reclaimer).

  • Mining Safety of Longwall Top-coal Caving in China - CORE

    Longwall top-coal caving technology has developed rapidly in China, in recent years. The application of longwall top-coal caving can double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 40%. Using standard longwall equipment, annual production can reach 3 million metric tons (Mt), and a

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

    Caving System.A method of mining in which the support of a great block of ore being removed, it is allowed to cave or fall, and in falling is broken sufficiently to be handled; the overlying strata subsides as the ore is withdrawn. Two important variations are Top slicing and cover caving; Top slicing combined with ore caving.

  • Recognition of rockcoal interface in top coal caving

    Top coal caving mining technology is widely used to mine thick coal seam because of the approachs advantages of high production, high efficiency, low energy consumption, low cost, and strong adaptability. However, a large problem exists in top coal caving with regard to heavy reliance on manual eyeballing for identifying the rockcoal

  • (PDF) Longwall Top Coal Caving Design for Thick Coal Seam

    Longwall top coal caving (LTCC) is a relatively new method of mining thick coal seams that is currently achieving high productivity and efficiency in application, particularly in China.

  • Combination of minimum enclosing balls classifier with SVM

    Sep 22, 2017· Top-coal caving technology is a productive and efficient method in modern mechanized coal mining, the study of coal-rock recognition is key to realizing automation in comprehensive mechanized coal mining. In this paper we propose a new discriminant analysis framework for

  • (PDF) Longwall top coal caving (LTCC) mining technologies

    The paper discusses advanced top coal caving technologies for thick coal seams and addresses some issues of incomplete coal extraction, which can result in the environmental damage, landscape

  • (PDF) Longwall top coal caving (LTCC) mining technologies

    Top Coal Caving Technology and Equipment (Unique Identifier RFMEF160417X0173). References [1] Klishin S V, Klishin V I and Opruk G Y 2013 Journal of Mining Science 49 932 940

  • Cavability assessment in longwall top coal caving technology

    Cavability assessment in longwall top coal caving technology By UNSW Faculty of Engineering Mining Engineering Abouzar Vakili Topics: Coal mines and mining, Caving, Thesis Digitisation Program

  • The Principle of Longwall Top Coal Caving (LTCC) - YouTube

    Apr 30, 2015· has extensive experience in the design of roof supports for specific mining conditions. Longwall Top Coal Caving (LTCC) roof supports allow m

  • top al caving mining method - MC World

    Key technologies and equipment for a fully mechanized top-coal caving . 2017-08-26 Although China was late to develop and apply top-coal caving mining technology, its development and applications are progressing very fast, showing significant economic potential

  • (PDF) Analysis of Roof Caving Characteristics at a Coal

    3D numerical modeling of longwall mining with top-coal caving. By Bahtiyar Ünver. Monitoring and modelling of gas dynamics in multi-level longwall top coal caving of ultra-thick coal seams, Part II: Numerical modelling. By Simon Zavsek and Jerneja Lazar.

  • Key technologies and equipment for a fully mechanized top

    Jul 21, 2015· A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. The coal extraction technologies for coal seams less than 14 m thick were extensively used in China.

  • to Supply Two Complete Longwall Top Coal

    The longwall top coal caving (LTCC) mining method to be employed at the Eynez East underground coal mine is a special type of longwall mining applicable to seams thicker than 6 meters (20 feet). Conventional longwall equipment has not yet been designed to operate successfully in seams thicker than approximately 6 meters (20 feet) mining height.

  • Theoretical analysis of support stability in large dip

    Support stability is all along one of the problems in mining at large dip angle coal seam with fully-mechanized top coal caving. Support stability such as anti-dumping, anti-slip, and anti-rotation at support tail assembly were analyzed on the basic of the mechanic model of large dip angle coal seam along face dip and strike. The relations between each factor and stability were researched

  • The sustainable development of coal mines by new cutting

    2007 Top coal caving longwall maximizes thick seam recoveryAustar's longwall system offers opportunities in seams thicker than 4.5 meters. E&Mj-Eng. Min. J. 208 , 50-56. Google Scholar

  • Key technologies and equipment for a fully mechanized top

    A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. The coal extraction technologies for coal seams less than 14 m thick were extensively used in China.

  • Study on Transport Rules and Fully Mechanized Mining with

    For the conditions of coal seam with huge thickness, structural complexity and intrusion by pyrolith in Datong carboniferous period, using laboratory similar simulation, on-site deep basis points observation and working face coal caving measurement, it is found out the migration and release laws of top coal, developed a practical caving technology.

  • Longwall Top Coal Caving Mechanisms in the Fractured Thick

    Aug 08, 2020· The integrated FDMDFN model enabled the influence of the preexisting fracture, stress redistribution, stress rotation, caving material compaction, and periodic rupture of roof strata to be superimposed on the failure process of top coal. It was revealed the LTCC influenced both magnitude and orientation of the principal stress within top coal.

  • Radiation characteristics of natural gamma-ray from coal

    Recognition of coal and gangue (roof rock) is a key technology to realize fully mechanized top coal caving automated mining. This paper proposes to detect the instantaneous refuse content of drawn coal and gangue mixture during top coal caving by using natural gamma-ray technology. The generating environment of coal and rock seams, the distribution characteristics of natural gamma ray from

  • Stability Analysis and Fracture Patterns of Hard Main Roof

    In order to study the fracture patterns of hard main roof in longwall top coal caving (LTCC) with large mining height, a two-dimensional physical similarity model was created to simulate the mining process of No. 8100 large mining height face in Tongxin coal mine, China. The results show that there are three positions of broken line in hard main roof presented with the advance of longwall face

  • Application of Longwall Top Coal Caving in Challenging

    developed mature in technology and employed in production for thick-seam deposits. These methods include: Multi-Slice Longwall, High Reach Longwall (single slice) and Longwall Top Coal Caving (LTCC). LTCC can mine out a seam varying from 4 to 20m in a single

  • DynamicResponseAnalysisoftheCoalGangue-likeElasticRock

    the analysis of the mining characteristics of the top coal caving and for the development of the top coal caving technology; however, they rarely refer to the study of the

  • Evolution of mininginduced stress in fully mechanized top

    1 INTRODUCTION. Since the technology of fully mechanized topcoal caving (FMTC) was first applied in the 1950s, with full development, it has become one of the landmark achievements in the field of coal mining in China, 1 and been recognized around the world. 2, 3 The studies of basic theories of FMTC mainly focus on the relationship between supports and surrounding rock failure mechanisms

  • Fully-Mechanized Top-Coal Caving Mining Recovery Rate

    The top-coal caving mining recovery rate is one of the important indexes of evaluating mining technical measures. This paper, by using the similar model and numerical simulation on the experimental analysis, fully integrates the advantages of numerical simulation and similarity simulation to simulate the rock mass deformation and stress rules in the two-slot mining process , and provides a

  • Numerical simulation on strata behaviours of TCCWF

    Due to top-coal and immediate roof as cushion layer connecting with support and overlying strata, it can make significant influence on strata behaviors in fully mechanical top-coal caving working face (TCCWF).

  • Three-dimensional experimental study of loose top-coal

    Longwall top-coal caving (LTCC) mining technology is a pro-ductive and economical method to extract thick coal seams, and thus is widely used in many coal mines in China (Wang, 2009; Wang et al., 2014). Although some hypotheses on top-coal draw-

  • How does Longwall Top Coal Caving work? LTCC Mining

    Jul 19, 2018· Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventional

  • Technical Aspects of Mining Rate Improvement in Steeply

    hardness of the coal, top coal dropping is preceded by layer destruction using blasting operations. Figure 2. Shortwall top coal caving method with the coal seam subdivided into horizontal levels. In this, typical mechanical systems are applied in the LTCC technology, which is why the method is

  • Technology - Coal Mining - Yancoal

    Longwall Top Coal Caving (LTCC) technology LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for an operation. Ultra Clean Coal (UCC) technology

  • Longwall Top Coal Caving Introduction underground COAL

    Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater 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.

  • Targeted inertization with flue gas injection in fully

    Aug 30, 2020· In fully mechanized caving gobs, the released methane comes mainly from the fragmented top coal, the residual coal in the gob, and other coal seams in the mining area. 51, 52 The structure of top coal is broken under the action of mining pressure, causing some of the gas flows into a gob from the fracture boundary. The amount of methane

  • LONGWALL TOP COAL CAVING (LTCC) Mining TECHNOLOGY -

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  • Long wall top coal caving - slideshare

    Nov 15, 2017· LONGWALL TOP COAL CAVING GENERAL INFORMATION It is the modified method of longwall mining system Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology in Australia at its Austar mine in 2006. This method has been developed in china in more recent years and is used there quite extensively and successfully.