longwall top coal caving technology

Stress analysis of longwall top coal caving | Request PDF

Longwall top coal caving (LTCC) is a relatively new method for mining thick coal seams that is currently achieving high productivity and efficiency in application [40, 41]. The largecutting-height ...

Techno-Economic Feasibility of the Longwall Top Coal ...

An extraction method for deep-seated thick seam deposits by underground mining with high resource recovery has remained a great challenge for Indian mining engineers, whereas the longwall top coal caving (LTCC) method has evolved as an effective method for various geo mining conditions in China and other counties. The percentage of top coal recovery (TCR) plays a predominant role in ...

Numerical simulation of realistic top coal caving ...

2021-6-24 · Top coal caving mining technology started in the 1980s and continues to this day 1,2.Longwall top coal caving (LTCC) mining consists of two processes: shearer cutting in front of a …

Longwall Top Coal Caving Method for Barapukuria Coal …

2016-9-9 · Abstract—The present research work deals with the coal extraction method for the Barapukuria Coal Field, Bangladesh. Various LTCC parameters, for example top coal failure behavior, strata caving mechanism, vertical stresses and abutment stresses, were evaluated for this mine using 2D. Examine. software for the assessment of LTCC technology ...

The Future | Longwall | underground COAL

Longwall top coal caving has started to be used (at Yancoal Australia Pty Ltd''s Austar Mine) and its use is expected to increase in the mid to long term. The main driving forces are likely to be: maximisation of resource recovery, probably at a relatively low incremental cost per tonne, and/or. the possibility of reducing equipment size ...

Mining Safety of Longwall Top-coal Caving in China

1999-6-11 · 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 maximum of 4.1 Mt has been obtained; many …

Longwall Top Coal Caving Mechanisms in the Fractured …

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.

Coal Mining

(LTCC) 2006,（ LTCC）,,。 LTCC 5 12,。 ...

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.

Longwall Top Coal Caving,Top Coal Caving,Top Coal …

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.

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 …

Longwall top coal caving (LTCC) mining technologies with ...

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 change, air and water pollution and endogenous fires. The authors put forward a fundamentally new, having no equivalent and ecology-friendly method to difficult-to-cave roof coal - directional hydraulic ...

Study on Controlling Parameters and Technological ...

2020-10-11 · Fully mechanized longwall top coal caving is one of the technologies applying for extraction of thick coal seams in developed coal industries in the world. One limitation of this technology raised from practice is that coal loss during top coal caving process remains large [BUI, M.T, 2014]. Particu-

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

2018-5-1 · Longwall top coal caving mining is one of the main methods of mining thick coal seams in China. Therefore, carrying out the classification evaluation of top coal caving is of great significance to ...

Three-dimensional experimental study of loose top-coal ...

2017-2-11 · Full length article Three-dimensional experimental study of loose top-coal drawing law for longwall top-coal caving mining technology Jiachen Wanga,b, Jinwang Zhanga,b,*, Zhengyang Songa,b, Zhaolong Lia,b aCollege of Resources and Safety Engineering, China University of Mining and Technology, Beijing 100083, China b State Key Laboratory of Coal Resources and Safe Mining, China …

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

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 50%. Using standard longwall equipment, annual production can reach 3 million metric tons (Mt), and a ...

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

1999-7-1 · 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 50%. Using standard longwall equipment, annual production can reach 3 million metric tons (Mt ...

How does Longwall Top Coal Caving work? LTCC Mining ...

2018-7-19 · 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 ...

Coal Zoom | Longwall Top-Coal Caving: A Productive and ...

2018-12-4 · Longwall Top-Coal Caving: A Productive and Efficient Alternative . December 4, 2018 - 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 ...

Energies | Free Full-Text | Longwall Top-Coal Caving ...

Longwall top-coal caving mechanisms and cavability optimization with hydraulic fracturing are analysed in this study. Based on the geological and geotechnical conditions of the Dongzhouyao coal mine, it is revealed that top-coal failure mechanisms are dominated by both compressive and tensile stresses. Ahead of the face line, shear failure initiates at the lower level of the top-coal and ...

Viewpoint Mining Magazine

Longwall Top-Coal Caving: A productive and efficient alternative. Longwall mining is one of the most productive ways to produce coal, but longwall mines have trouble efficiently mining seams higher than 6 m (19.6 ft). Longwall Top-Coal Caving can more than double the resource recovery rate of normal longwall equipment working in high seams.

Longwall Top Coal Caving (LTCC) technology

Longwall Top Coal Caving (LTCC) technology. Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology to Australia at its Austar mine in 2006. Developed in China, top coal caving uses a modified long wall mining system. LTCC allows the …

University of Wollongong Research Online

2020-10-13 · Austar Mine is the first mine in Australia to successfully implement the Longwall Top Coal Caving (LTCC) mining method. The mine is extracting the Greta Seam of 6 m thickness at a depth of approximately 520 m. The main overburden unit is the Branxton Formation which is massive and strong (fine to medium sandstone/silty sandstone/pebbly bands).

Evaluation of mine scale longwall top coal caving ...

2011-11-1 · Mining Science and Technology (China) Volume: 21 Issue: 6 Pages: 787-796 Abstract: A mine-scale analysis of Longwall Top Coal Caving (LTCC) is performed using a continuum mechanics finite element solver called COSFLOW. The uniqueness of cosflow is that is incorporates Cosserat continuum theory in its formulation for describing the load ...

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.

A review of cavability evaluation in longwall top coal caving

Longwall Top Coal Caving (LTCC) technology - Yancoal

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3. Zhengyang Song*, Heinz Konietzky, Martin Herbst. Drawing mechanism of fractured top coal in longwall top coal caving, International Journal of Rock Mechanics and Mining Sciences. 2020. (If=4.151) SCI. ESI 4. Xin Cai, Zilong Zhou, Lihai Tan

Longwall Top Coal Caving (LTCC) Mining Technology

Long wall top coal caving

2017-11-15 · 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 …

A review of cavability evaluation in longwall top coal caving

2017-11-1 · Longwall Top Coal Caving was initially developed in the former Soviet Union and France in the 1950s and 1960s. It was then applied in the former Yugoslavia, Hungary, Romania, the former Czechoslovakia and Turkey,, .The ''Soutirage'' method which was developed in France in the 1960s is considered as the original form of LTCC .The system includes a conventional longwall face operating …

Viewpoint Mining Magazine

(LTCC) 2006,（ LTCC）,,。 LTCC 5 12,。 ...

Application of Longwall Top Coal Caving in Challenging ...

2020-1-8 · 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 pass, requiring insignificant change to the face equipment.

Viewpoint Mining Magazine

Longwall Top-Coal Caving isn''t just an alternative mining technique; it can be the difference between a productive, profitable mine and an unsustainable operation. The technology reduces waste and operating costs, making for a more efficient operation.

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longwall top coal caving technology