Home Products Case About Us Contact Us
···

Mill Separator Micro Powder

Caving mechanisms of loose top-coal in longwall top-coal ...

2014-10-1  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.

Get Price

Caving mechanisms of loose top-coal in longwall top-coal ...

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.

Get Price

Longwall Top Coal Caving Introduction underground COAL

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

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 ...

Get Price

(PDF) Longwall Top Coal Caving Method for Barapukuria Coal ...

Longwall Top Coal Caving Method for Barapukuria Coal Field, Dinajpur, Bangladesh May 2016 International Journal of Scientific and Engineering Research 7(4):285-293

Get Price

Application of Longwall Top Coal Caving in Challenging ...

2020-1-8  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

Get Price

LONGWALL TOP COAL CAVING MINING Zhengyang Song

2021-7-22  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

Get Price

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.

Get Price

Top Coal Movement Law of Dynamic Group Caving Method in ...

2020-7-7  Longwall top coal caving mining (LTCC) is an efficient mining method to extract thick and extra-thick seams. As shown in Fig. 1, the bottom coal is extracted by the shearer and transported out of the panel by the front armored face conveyor (AFC), while the loose top coal that fractured by the mining stress and repeated force of support is drawn from the support opening (SO) and transferred ...

Get Price

Longwall Top Coal Caving Method for Barapukuria Coal

2016-9-9  Longwall Top Coal Caving Method for Barapukuria Coal Field, Dinajpur, Bangladesh. Nadia Sultana Tarakki, Chowdhury Quamruzzaman, Mohammad Tofayal Ahmed, Md. Mizanur Rahman, Md. Badrul Alam, Chowdhury Rayhan . Abstract—The present research work deals with the coal extraction method for the Barapukuria Coal Field, Bangladesh. Various

Get Price

Caving mechanisms of loose top-coal in longwall top-coal ...

Today, the top-coal caving longwall mining is the major mining method for thick seam coal mining in China. In the Datong coal district, the annual production is 1.5 million metric tons per panel. The top-coal caving longwall mining has attained outstanding achievements in coal mines with favorable conditions.

Get Price

Longwall Top Coal Caving Introduction underground COAL

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 Mechanisms in the Fractured Thick ...

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 ...

Get Price

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 ...

Get Price

(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.

Get Price

Mining safety of longwall top-coal caving in China ...

Longwall top-coal caving is distinctly different from slice mining in thicken seam. Concerns of safety and productivity for this method have been raised in recent years. This paper will discuss the following: (1) how to recognize the law of fire-damp emission, accumulation and outburst; (2) ...

Get Price

Longwall top coal caving design for thick coal seam in ...

2021-2-1  Longwall top coal caving design for thick coal seam in very poor strength surrounding strata H. Jangara1 • C. Atilla Ozturk1 Received: 14 July 2020/Revised: 7 October 2020/Accepted: 18 December 2020 The Author(s) 2021 Abstract Alpu lignite field is an important coal deposit with nearly 2 billion tons of coal resources located in the middle ...

Get Price

A Brief Comparison of Longwall Methods Used at Mining

2009-9-17  The Longwall Top Coal Caving Method In Turkey, the LTCC method has been applying for many years. It is based on the 'Soutirage' longwall caving method originally developed in the French coal mining industry. 142 . The 19th International Mining Congress and Fair of Turkey, IMCET2005, İzmir, Turkey, June 09-12, 2005

Get Price

OptimizationofCavingTechnologyinanExtrathickSeamwith ...

2021-8-4  e optimization of top coal caving technology is an efficient method to improve the recovery ratio in longwall top coal caving (LTCC). In extrathick coal seams, the conventional single-opening sequential caving technology (SOSCT) shows the following problems: low recovery ratio, high rock mixed ratio, and poor drawing balance.

Get Price

Longwall Top Coal Caving Method for Barapukuria Coal

2016-9-9  Longwall Top Coal Caving Method for Barapukuria Coal Field, Dinajpur, Bangladesh. Nadia Sultana Tarakki, Chowdhury Quamruzzaman, Mohammad Tofayal Ahmed, Md. Mizanur Rahman, Md. Badrul Alam, Chowdhury Rayhan . Abstract—The present research work deals with the coal extraction method for the Barapukuria Coal Field, Bangladesh. Various

Get Price

Longwall Top Coal Caving Introduction underground

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

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 ...

Get Price

Longwall Top Coal Caving Mechanisms in the Fractured

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 ...

Get Price

Longwall Top Coal Caving Method and Its Future in China

2021-7-30  Abstract This paper gives a brief introduction of the longwall top coal caving (LTCC) method which has had a strong impact on China´s coal mining industry since 1980 s.Great contribution to LTCC has been made by Chinese experts including cavability assessment, overlying geological variations on support loading, geotechnological characterization, technique and process for increasing recovery ...

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

Mining safety of longwall top-coal caving in China ...

Longwall top-coal caving is distinctly different from slice mining in thicken seam. Concerns of safety and productivity for this method have been raised in recent years. This paper will discuss the following: (1) how to recognize the law of fire-damp emission, accumulation and outburst; (2) ...

Get Price

Mining Safety of Longwall Top-coal Caving in China

2020-11-4  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.

Get Price

Fuqiang Gao *, Doug Stead , John Coggan

2019-9-12  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

Get Price

Long wall top coal caving - SlideShare

2017-11-15  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

Get Price