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Longwall Top Coal Caving Method Play

The Principle of Longwall Top Coal Caving (LTCC)

30-04-2015  Caterpillar has extensive experience in the design of roof supports for specific mining conditions. Cat Longwall Top Coal Caving (LTCC) roof supports allow m...

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Application of Longwall Top Coal Caving in Challenging ...

Abstract-Longwall top coal caving (LTCC) techniques has been employed in favourable geological conditions widely in China since the mid-80s and in Australia recently. With the improvement of highly-powered face equipment and the method itself, in the past 15 years, LTCC was introduced to more challenging geological

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Stress analysis of longwall top coal caving -

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. The technique is similar to traditional longwall mining in that a cutting head slices coal from the lower section of the coal seam onto a conveyor belt installed in front of the hydraulic support near

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Caving mechanisms of loose top-coal in longwall

01-10-2014  The top-coal caving longwall mining is one of the major mining methods for extracting thick coal seams in China. The top-coal caving mining was estimated to have produced about 0.6 billion metric tons every year, accounts

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Longwall Top Coal Caving Mechanisms in the

In this study, the finite difference method (FDM) coupled with a discrete fracture network (DFN) was utilized to analyze longwall top coal caving (LTCC) behaviors. The integrated FDM–DFN 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

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3D numerical modeling of longwall mining with

01-02-2005  Coal has been produced by means of longwall retreat with the top-coal-caving production method where a 2.8 m high longwall face was operated at the floor of the coal seam . Top-slice coal having a thickness of 5.2 m was caved and produced through windows located at the top of the shields.

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The Principle of Longwall Top Coal Caving (LTCC)

30-04-2015  卡特彼勒在特殊开采条件的液压支架设计方面拥有丰富的经验。Cat长壁放顶煤开采液压支架可以应用于煤层厚度超过6米(20 ...

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Application of Longwall Top Coal Caving in Challenging ...

Abstract-Longwall top coal caving (LTCC) techniques has been employed in favourable geological conditions widely in China since the mid-80s and in Australia recently. With the improvement of highly-powered face equipment and the method itself, in the past 15 years, LTCC was introduced to more challenging geological

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Viewpoint Mining Magazine - Longwall Top-Coal

The Longwall Top-Coal Caving (LTCC) method makes use of a second conveyor and the natural force of gravity to recover coal above the shearer’s recommended height once the face has advanced. According to Dr. Sebastian Mundry, a Caterpillar Inc. longwall automation manager, LTCC eliminates all the problems commonly associated with high-seam longwall mining.

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Longwall Top Coal Caving Method - SlideShare

LTCC • Longwall Top coal Caving (LTCC) is a method of extraction for underground mining of thick seams. • It uses a longwall set-up and natural forces to aid in the winning of coal. 4. Problems Associated With Thick Seam Extraction • Underground Coal loss.

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The Principle of Longwall Top Coal Caving

Caterpillar has extensive experience in the design of roof supports for specific mining conditions. Cat Longwall Top Coal Caving (LTCC) roof supports allow m...

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Longwall Top Coal Caving Introduction

Longwall Top Coal Caving Longwall Top Coal Caving 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.

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3D numerical modeling of longwall mining

01-02-2005  Coal has been produced by means of longwall retreat with the top-coal-caving production method where a 2.8 m high longwall face was operated at the floor of the coal seam . Top-slice coal having a thickness of 5.2 m was caved and produced through windows located at the top of the shields.

More

Longwall Top Coal Caving Mechanisms in the

In this study, the finite difference method (FDM) coupled with a discrete fracture network (DFN) was utilized to analyze longwall top coal caving (LTCC) behaviors. The integrated FDM–DFN 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

More

Caving mechanisms of loose top-coal in

01-10-2014  The top-coal caving longwall mining is one of the major mining methods for extracting thick coal seams in China. The top-coal caving mining was estimated to have produced about 0.6 billion metric tons every year, accounts for 18% of underground coal mining in China.

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Fuqiang Gao *, Doug Stead , John Coggan

the longwall top coal caving method [15–18]. A limitation in these models was that fractures could only develop along pre-existing discontinuities including persistent bedding planes and cross joints. The proposed UDEC Trigon approach is used in this paper to create a longwall model in

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A discontinuum modelling approach for

The lower section is mined by the conventional longwall method while the top coal section is typically extracted by means of caving under the impact of gravity (Fig. 1). 2 Compared to other longwall methods such as Multi-Slice Longwall and High Reach Single Pass Longwall, LTCC can offer significantly reduced operational cost, high production and resource recovery rate, and

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Longwall Top Coal Caving (LTCC) Mining

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.

More

Longwall Top Coal Caving Mechanisms in the

In this study, the finite difference method (FDM) coupled with a discrete fracture network (DFN) was utilized to analyze longwall top coal caving (LTCC) behaviors. The integrated FDM–DFN 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.

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Study on Caving Mechanism in Longwall Top

Longwall Top Coal Caving (LTCC) is an improved longwall mining technique that has shown many advantages compared with other methods in terms of coal recovery rate, face equipment design, development cost and spontaneous combustion control for extracting coal seam with thickness in excess of 4.5 m (Hebblewhite et al. 2002).

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Caving mechanisms of loose top-coal in longwall

A good understanding of the caving mechanisms of loose top-coal is significant for longwall top-coal caving (LTCC) mining. In this paper, the equations of the particle motion, top-coal boundary, and drawing body were derived based on the stochastic medium theory.

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Coal Zoom Longwall Top-Coal Caving: A

04-12-2018  The Longwall Top-Coal Caving (LTCC) method makes use of a second conveyor and the natural force of gravity to recover coal above the shearer’s recommended height once the face has advanced. According to Dr. Sebastian Mundry, a Caterpillar Inc. longwall automation manager, LTCC eliminates all the problems commonly associated with high-seam longwall mining.

More

Mining Safety of Longwall Top-coal Caving in China

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 40o/o. Using standard longwall equipment, annual production can reach 3 million metric tons (Mt), and a maximum of 4.1 Mt has

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Fuqiang Gao *, Doug Stead , John Coggan

the longwall top coal caving method [15–18]. A limitation in these models was that fractures could only develop along pre-existing discontinuities including persistent bedding planes and cross joints. The proposed UDEC Trigon approach is used in this paper to create a longwall model in

More

Numerical modeling of longwall top coal caving

The preferred mining method for these thick coal seams is the Longwall Top Coal Caving (LTCC). The connection of both the top coal caving and its compactness are still rare; therefore, the capability of top coal caving mechanism is the most significant factor in LTCC that must be

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Longwall Top Coal Caving Mining - vosweb.nl

Coal has been produced by means of longwall retreat with the top-coal-caving production method where a 2.8 m high longwall face was operated at the floor of the coal seam . Top-slice coal having a thickness of 5.2 m was caved and produced through windows located at the top of the shields.

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The Key Stratum Structure Morphology of

Longwall mechanized top coal caving mining (LMTCCM) in extra-thick coal seams has its own characteristics. The law of mining pressure and overlying strata failure height in extra-thick coal seams are much larger than those of medium-thick and thick coal seams.

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Long wall top coal caving - SlideShare

15-11-2017  Long wall top coal caving 1. LONGWALL TOP COAL CAVING P SHASHIKANTH 16MT001042 2. LONGWALL TOP COAL CAVING GENERAL INFORMATION • It is the modified method of longwall mining system • Yancoal introduced the Longwall Top Coal Caving

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Application of Longwall Top Coal Caving in Challenging ...

Abstract-Longwall top coal caving (LTCC) techniques has been employed in favourable geological conditions widely in China since the mid-80s and in Australia recently. With the improvement of highly-powered face equipment and the method itself, in the past 15 years, LTCC was introduced to more challenging geological

More

Evaluation of Mine Scale Longwall Top Coal Caving ...

Longwall Top Coal Caving (LTCC) is an underground mining method developed for thick seam extraction. Depending on the coal seam condition various layouts can be considered for the LTCC [1]. The full seam height LTCC mining layout has been chosen for this work as it

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Application of retreating and caving longwall

This latter method was introduced to gain maximum tonnage from the extraction of an 8 m lignite coal seam under very difficult mining conditions. The present paper discusses the application of the longwall top coal caving method and its advantages and disadvantages compared with conventional longwall mining at the mine.

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Longwall Top Coal Caving Mining - vosweb.nl

Coal has been produced by means of longwall retreat with the top-coal-caving production method where a 2.8 m high longwall face was operated at the floor of the coal seam . Top-slice coal having a thickness of 5.2 m was caved and produced through windows located at the top of the shields.

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Mining Safety of Longwall Top-coal Caving in China

2Zhangji Coal Mine, Xuzhou Mining Bureau, Xuzhou 221147, Jiangsu Province, P.R of China ABSTRACT 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 40o/o.

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Key technologies and equipment for a fully mechanized top ...

mechanized longwall top-coal caving mining method. A longwall panel is laid out at the bottom of the thick coal seam and extracted using a fully mechanized longwall mining method. At the same time, the remaining coal above the longwall face are fractured by ground stress and strain

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Longwall Top Coal Caving at the Broadmeadow

The Broadmeadow mine was started using a longwall to extract coal at 4.7 m (15 ft) leaving the top section of the seam to fall into the gob. The adjacent open-cut mine has been mining the full seam section for more than 30 years, investigations and evaluations were made into the Top Coal Caving method and its suitability for the operation.

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Interactions of overburden failure zones due to multiple ...

The longwall top coal caving (LTCC) method is an effective mining approach that originated in Europe, and has been widely and successfully used in China. Over-burden stress distribution, top coal caving and fracturing mechanisms and evaluations, and interaction between strata movement and hydraulic supports have attracted

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Sublevel Caving Mining Méthode -

Caving Underground Mining Methods (longwall, 2014/10/23 Caving Underground Mining Methods (longwall, Sublevel caving, Block caving) 1. This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.

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