longwall top coal caving process

longwall top coal caving process

Top Coal Caving Longwall underground COAL

A brief description of longwall top coal caving (LTCC) is included at the end of the Longwall section of the Fundamentals of Coal Mining module of this web site. Despite the fact that there are numerous coal seams in Australia which are thick enough for LTCC to be used to increase recoveries, potentially at a reduced cost/tonne, there has been little application of the process

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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.

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Longwall Top Coal Caving Introduction

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

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LONGWALL TOP COAL CAVING MINING Zhengyang

A 3D particle-based numerical approach to simulate the longwall top coal caving (LTCC) process was proposed, which for the first time the effect of continuous support advance and the face-end...

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Caving mechanisms of loose top-coal in longwall top

2014-10-1  The major features of the top-coal caving mining are that a conventional longwall mining with cutting height 2–3 m is performed at the bottom of a thick seam, say more than 5 m thick, followed by drawing of the broken top-coal. The top-coal is crushed into fragments under the overburden pressure and drawn through an opening at the rear of the shield support.

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Caving mechanisms of loose top-coal in longwall top

The major features of the top-coal caving mining are that a conventional longwall mining with cutting height 2–3 m is performed at the bottom of a thick seam, say more than 5 m thick, followed by drawing of the broken top-coal. The top-coal is crushed into fragments under the overburden pressure and drawn through an opening at the rear of the shield support.

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Geotechnical Considerations for Longwall Top Coal

2020-7-2  LONGWALL TOP COAL CAVING DESCRIPTION . Longwall Top Coal Caving (LTCC) is an enhanced form of the conventional longwall recovery system, whereby a rear Armoured Face Conveyor (AFC) (refer to Figure 3) is utilised to extract coal from behind the powered supports that would otherwise be left unrecovered in thick seam environments. The major

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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 the cutting face.

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Mining Safety of Longwall Top-coal Caving in China

2020-11-4  Longwall top-coal caving technology has developed rapidly in China, in recent years. The application of longwall top-coal 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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Viewpoint Mining Magazine Longwall Top-Coal Caving

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

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LONGWALL TOP COAL CAVING MINING Zhengyang

A 3D particle-based numerical approach to simulate the longwall top coal caving (LTCC) process was proposed, which for the first time the effect of continuous support advance and the face-end

get price

Longwall Top Coal Caving Introduction

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

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Longwall Top Coal Caving Method SlideShare

2014-2-19  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

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Geotechnical Considerations for Longwall Top Coal

2020-10-13  LONGWALL TOP COAL CAVING DESCRIPTION . Longwall Top Coal Caving (LTCC) is an enhanced form of the conventional longwall recovery system, whereby a rear Armoured Face Conveyor (AFC) (refer to Figure 3) is utilised to extract coal from behind the powered supports that would otherwise be left unrecovered in thick seam environments. The major

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Longwall Top Coal Caving Mechanisms in the

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. It was revealed the LTCC influenced both magnitude and orientation of the principal stress within top coal.

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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

get price

Evaluation of the application of the Longwall Top Coal

• caving longwall systems (CL), including longwall top coal caving (LTCC). a risk assessment process, some of the other issues such as mining under goaf areas (water and gas

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PAPER OPEN ACCESS Functional schemes of automated

2020-3-14  equipment in longwall top coal caving method (LTCC) with coal discharge to face conveyor. The application of the proposed schemes lessens the influence of the human factor, prevents coal dilution, eliminates conveyor overloading, decreases workload of shearer operator in face area and reduces the probability of making errors by operators. 1.

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The Key Stratum Structure Morphology of Longwall

2020-8-28  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. The key stratum structure morphology also has an important influence on the law of overlying strata movement and stability of

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Viewpoint Mining Magazine Longwall Top-Coal Caving

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

get price

Geotechnical Considerations for Longwall Top Coal

2020-7-2  LONGWALL TOP COAL CAVING DESCRIPTION . Longwall Top Coal Caving (LTCC) is an enhanced form of the conventional longwall recovery system, whereby a rear Armoured Face Conveyor (AFC) (refer to Figure 3) is utilised to extract coal from behind the powered supports that would otherwise be left unrecovered in thick seam environments. The major

get price

Longwall Top Coal Caving Introduction

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

get price

Longwall Top Coal Caving Method SlideShare

2014-2-19  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

get price

Longwall Top Coal Caving Mechanisms in the

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. It was revealed the LTCC influenced both magnitude and orientation of the principal stress within top coal.

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1,Defu Zhu 1,2,3, Zhonglun Wang 1 MDPI

2021-1-4  Keywords: longwall top coal caving; drawing characteristic; evolution process; FDM-DEM numeri-cal model 1. Introduction As one of the main methods for underground thick seam mining, longwall top coal caving (LTCC) has been fully developed and applied in China [1]. The coal seam is divided into two parts in LTCC: bottom coal and top coal.

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Longwall top coal caving design for thick coal seam in

2021-2-1  The amount of coal for the production panel must be high enough to cover the initial investment of the mechanized longwall system. Longwall top coal caving (LTCC) is a part of longwall mining that is applicable for thick coal seams. China is an important country, which has best practices of LTCC in terms of high production rates.

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Evaluation of the application of the Longwall Top Coal

• caving longwall systems (CL), including longwall top coal caving (LTCC). a risk assessment process, some of the other issues such as mining under goaf areas (water and gas

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Case Study on Overburden Fracturing during Longwall

2016-9-22  Longwall top coal caving (LTCC) is a highly efficient underground mining method that has recently been introduced and modified, and is now being used in underground coal mines in China. The major difference between LTCC and traditional longwall methods is that LTCC extracts caved coal from behind shields as well as from the sheared face.

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PAPER OPEN ACCESS Functional schemes of automated

2020-3-14  equipment in longwall top coal caving method (LTCC) with coal discharge to face conveyor. The application of the proposed schemes lessens the influence of the human factor, prevents coal dilution, eliminates conveyor overloading, decreases workload of shearer operator in face area and reduces the probability of making errors by operators. 1.

get price