Longwall Top Coal Caving Process

  • Roof Support Systems

    Roof Support Systems

    Longwall Top Coal Caving The Longwall Top Coal Caving (LTCC) roof support allows mining to a total seam height of more than 10 m (33 ft) by using a longwall shearer to cut the bottom – 3 m ( – ft) and then caving the top coal behind the roof supports onto a rear AFC. This type of longwall is in service

  • Longwall Mining Method and Design

    Longwall Mining Method and Design

     · Longwall Mining Method and Design. Studies estimate that 156 billion tons of coal, representing 68 pct of the minable reserves in the United States, is subject to multipleseam mining. Historically, roomandpillar mining has dominated coal production, and this mining method has been the focus of most multipleseam research.

  •  Longwall Mining | ABC 123: Testing Site / Course

    Longwall Mining | ABC 123: Testing Site / Course

     · Longwall Mining of Coal. Longwall mining of coal is a high production and high productivity method, employing sophistied electrical, mechanical, and hydraulic systems, as well as computerbased monitoring and control systems. Most modern (coal) longwall faces are semiautomated. It is noteworthy that longwall operations in trona mines utilize essentially the same equipment and processes ...

  • Longwall Top Coal Caving (LTCC) Mining 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 ) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.

  • Top Coal Caving Longwall Maximizes Thick Seam Recovery

    Top Coal Caving Longwall Maximizes Thick Seam Recovery

    Top Coal Caving Longwall Maximizes Thick Seam Recovery Austar's longwall system offers opportunities in seams thicker than meters By Greg Duncan, ... The caving process has been automated and the shearer is handling the complex profile .

  • LONGWALL MINING FOR UNDERGROUND COAL ~ Mining .

    LONGWALL MINING FOR UNDERGROUND COAL ~ Mining .

     · Longwall mining systems are capable of producing significant outputs from a single longwall face – 8 million tones per annum or more. When operating correctly the coal is mined in a systematic, relatively continuous and repetitive process which is ideal for strata control and for associated mining operations.

  • Viewpoint Mining Magazine

    Viewpoint Mining Magazine

    Longwall TopCoal Caving: A productive and efficient alternative In the right conditions, longwall mining is one of the safest, most productive and most efficient ways to produce coal. This is owed in part to the high degree of automation employed by modern longwall operations, which keeps shearers and roof supports advancing smoothly and people far from the dangers of the face.

  • Drawing mechanism of fractured top coal in longwall top ...

    Drawing mechanism of fractured top coal in longwall top ...

     · This work proposed a progressivesectional failure model (PSFM) based on Particle Flow Code (PFC) to simulate top coal drawing process in longwall top coal caving (LTCC) mining. The progressivesectional fracturing of top coal was reproduced in simulation. 4 drawing schemes are numerically performed by considering drawing sequences and strategies.

  • longwall top coal caving process

    longwall top coal caving process

    Figure 20 from A particlebased numerical investigation on . Fig. 20 a Vertical force variations on the DS during the whole simulation process, b enlarged area A, c enlarged area B "A particlebased numerical investigation on longwall top coal caving mining" DOI: /sz Corpus ID: A particle

  • Characteristics of Drawing Body Shape in LTCC: Theoretical ...

    Characteristics of Drawing Body Shape in LTCC: Theoretical ...

    The topcoal caving process in LTCC and block caving process in metal mines are both gravity flows of loose coal/ore blocks, as shown in Figure 2. However, the presence of caving shields in LTCC causes the characteristics of the drawing body shapes in the two caving processes to differ are two main differences between the blocking method and the topcoal caving method:"

  • fullmechanizedlongwallcoalminingsteeplyinclinedcoal ...

    fullmechanizedlongwallcoalminingsteeplyinclinedcoal ...

    Full Mechanized Mining (longwall) on 78 Degree Steeply Inclined Coal Seam. 3212 (II) Working Face of Lushuidong Coal Mine of Guangneng Company of Sichuan Coal Group is loed in the West Wing of Daluowan anticline. The panel length of this coal mine is 550 .

  • The Principle of Longwall Top Coal Caving (LTCC ...

    The Principle of Longwall Top Coal Caving (LTCC ...

     · Longwall Top Coal Caving (LTCC) roof supports allow mining of seams seams thicker than 6 meters (20 feet). Following a conventional cut with a shearer to about 3 m ( ft) the roof supports move forward and allow the caving of the top coal behind the roof supports a .

  • Coal mining with Triplesection extraction process in ...

    Coal mining with Triplesection extraction process in ...

    This paper introduces the Triplesection extraction process in the threedimensional roadway layout of stagger arrangement method for longwall topcoal caving mining. This 3D roadway layout of stagger arrangement method without coal pillars, which arranged the air intake roadway and air return roadway in different horizons, realizing the design theory transformation of roadway layout from 2D ...

  • Fuqiang Gao *, Doug Stead, John Coggan

    Fuqiang Gao *, Doug Stead, John Coggan

    Evaluation of coal longwall caving characteristics using an innovative UDEC Trigon approach Fuqiang Gao a,*, Doug Stead a, John Coggan b a Engineering Geology and Resource Geotechnics Group, Simon Fraser University, Burnaby, BC, Canada b Camborne School of Mines, University of Exeter, United Kingdom Abstract: The paper presents an innovative numerical approach to simulate progressive caving

  • Longwall Top Coal Caving ~ Mining Engineering Science

    Longwall Top Coal Caving ~ Mining Engineering Science

     · Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than ) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.

  • Appliion of Longwall Top Coal Caving in Challenging ...

    Appliion of Longwall Top Coal Caving in Challenging ...

    AbstractLongwall top coal caving (LTCC) techniques has been employed in favourable geological conditions widely in China since the mid80s and in Australia recently. With the improvement of highlypowered face equipment and the method itself, in the past 15 years, LTCC was introduced to more challenging geological

  • 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 longwall mining method for very thick seams (thickness is more than ) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height.

  • Mining Safety of Longwall Topcoal Caving in China

    Mining Safety of Longwall Topcoal Caving in China

    2Zhangji Coal Mine, Xuzhou Mining Bureau, Xuzhou 221147, Jiangsu Province, of China ABSTRACT Longwall topcoal caving technology has developed rapidly in China, in recent years. The appliion of longwall topcoal caving can double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 40o/o.

  • Deformation Movement of HugelyThick Conglomerate Stratum ...

    Deformation Movement of HugelyThick Conglomerate Stratum ...

     · In the process of longwall top coal caving, the deformation and movement of the overlying hugelythick conglomerate stratum (HTCS) directly affects the rock pressure behavior in the longwall. Based on conditions of the geology and mining of coal face 13,180 at Gengcun coal mine of Yima Mining Area, China, numerical and similar material simulations were carried out, and the .

  • Ground Response and MiningInduced Stress in Longwall ...

    Ground Response and MiningInduced Stress in Longwall ...

    Ground Response and MiningInduced Stress in Longwall Panel of a KilometerDeep Coal Mine ... around the gate during longwall topcoal caving [25]. It ... influenced topcoal cavability to a large extent [29–31]. In deep coal mines, ...