longwall top coal caving mining

longwall top coal caving mining

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 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 mining

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LONGWALL TOP COAL CAVING MINING Zhengyang Song 1 ...

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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Longwall Top Coal Caving (LTCC) technology - Yancoal

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 excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for ...

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

longwall top-coal caving mining technolog y,” Jiachen Wang, Jinwang Zhang, Zhengyang Song . and Zhaolong Li (China University of Mining and Technology) investigate the loose top-coal drawing .

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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 ...

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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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Ultra-thick Seam Longwall Mining in China Coal Age

Oct 24, 2013  The disadvantages of top coal caving are that the recovery rate of top coal at both ends of the face is very low and the coal left in the gob is the source for spontaneous combustion. Therefore, the ultra-thick whole seam one slice longwall mining was developed to increase the recovery rate and safety of ultra-thick coal seams in 2009.

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LONGWALL TOP COAL CAVING (LTCC) Mining TECHNOLOGY -

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Longwall top coal caving mining Taylor Francis Group

Longwall top coal caving mining . DOI link for Longwall top coal caving mining. Longwall top coal caving mining book. By Syd S. Peng. Book Longwall Mining. Click here to navigate to parent product. Edition 3rd Edition. First Published 2019. Imprint

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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 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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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 ...

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

longwall top-coal caving mining technolog y,” Jiachen Wang, Jinwang Zhang, Zhengyang Song . and Zhaolong Li (China University of Mining and Technology) investigate the loose top-coal drawing .

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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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Longwall Top Coal Caving Method - SlideShare

Feb 19, 2014  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.

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Long wall top coal caving - SlideShare

Nov 15, 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 (LTCC) mining technology in Australia at its Austar mine in 2006.

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Effect of Key Parameters on Top Coal First Caving and Roof ...

May 05, 2020  The first caving of top coal and the first weighting of roof strata in Longwall Top Coal Caving (LTCC) mining were analyzed in a parametric study by using a discontinuum modeling technique with plastic rock material. The analysis demonstrated that an increase in the value of cover depth decreases the stability of main roof strata, while the ...

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Case study of the mining-induced stress and fracture ...

The evolution of the mining-induced fracture network formed during longwall top coal caving (LTCC) has a great influence on the gas drainage, roof control, top coal recovery ratio and engineering safety of aquifers. To reveal the evolution of the mining-induced stress and fracture network formed during LTCC, the fracture network in front of the working face was observed by borehole video ...

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MODERN MINING TECHNOLOGY FOR COAL EXTRACTION

1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.

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

Dec 04, 2018  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

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3D numerical modeling of longwall mining with top-coal caving

The model was composed of 16,524 elements and 18,648 grid points as shown in Fig. 10. Model for top-coal cavingSteps of the 3D modeling of the M3 longwall face and top-coal caving are given as follows:1. In order to obtain proper results from models formed to analyze caving of top coal, only a small part of the face was modeled.

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Strong Ground Pressure Mechanism and Control at the ...

Both seams have simple structures and well field profiles, as well as stable horizons. The longwall top coal caving (LTCC) method is applied to the working face, with a mining height of 3.5 m and a caving height of 3 m. Thus, the mining-to-caving ratio is 1 : 0.86, and the average daily advance speed is

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

@article{osti_20020940, title = {Mining safety of longwall top-coal caving in China}, author = {Wu, J and Qin, Y and Zhai, M}, abstractNote = {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%.

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Longwall top coal caving mining Taylor Francis Group

Longwall top coal caving mining . DOI link for Longwall top coal caving mining. Longwall top coal caving mining book. By Syd S. Peng. Book Longwall Mining. Click here to navigate to parent product. Edition 3rd Edition. First Published 2019. Imprint

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Longwall Top Coal Caving Method - SlideShare

Feb 19, 2014  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.

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Long wall top coal caving - SlideShare

Nov 15, 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 (LTCC) mining

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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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3D numerical modeling of longwall mining with top-coal caving

The model was composed of 16,524 elements and 18,648 grid points as shown in Fig. 10. Model for top-coal cavingSteps of the 3D modeling of the M3 longwall face and top-coal caving are given as follows:1. In order to obtain proper results from models formed to analyze caving of top coal, only a small part of the face was modeled.

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Effect of Key Parameters on Top Coal First Caving and Roof ...

May 05, 2020  The first caving of top coal and the first weighting of roof strata in Longwall Top Coal Caving (LTCC) mining were analyzed in a parametric study by using a discontinuum modeling technique with plastic rock material. The analysis demonstrated that an increase in the value of cover depth decreases the stability of main roof strata, while the ...

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Caterpillar to Supply Two Complete Longwall Top Coal ...

The longwall top coal caving (LTCC) mining method to be employed at the Eynez East underground coal mine is a special type of longwall mining applicable to seams thicker than 6 meters (20 feet). Conventional longwall equipment has not yet been designed to operate successfully in seams thicker than approximately 6 meters (20 feet) mining height.

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Case study of the mining-induced stress and fracture ...

The evolution of the mining-induced fracture network formed during longwall top coal caving (LTCC) has a great influence on the gas drainage, roof control, top coal recovery ratio and engineering safety of aquifers. To reveal the evolution of the mining-induced stress and fracture network formed during LTCC, the fracture network in front of the working face was observed by borehole video ...

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MODERN MINING TECHNOLOGY FOR COAL EXTRACTION

1. Coal loss occuring during the production of the top coal (20 to 30 %) 2. The coal left behind the face poses danger of spontaneous combustion. 3. Poor face alignment may not only cause face roof control problems but also affect the top coal caving process 4. Floor heave behind the rear AFC is likely.

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Strong Ground Pressure Mechanism and Control at the ...

Both seams have simple structures and well field profiles, as well as stable horizons. The longwall top coal caving (LTCC) method is applied to the working face, with a mining height of 3.5 m and a caving height of 3 m. Thus, the mining-to-caving ratio is 1 : 0.86, and the average daily advance speed is

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Amazon: Longwall Mining, 3rd Edition (9780367201920 ...

Since the last plow longwall mine was closed in 2018, the chapter on plow longwalling has been dropped and in its place Automation of Longwall Components and System is added. Also, a new chapter Longwall Top Coal Caving Mining (LTCC) is added due

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Longwall Top Coal Caving Mechanisms in the Fractured Thick ...

Aug 08, 2020  Associate Professor, Coal Industry Engineering Research Center of Top Coal Caving Mining, China Univ. of Mining and Technology, D11 Xueyuan Rd., Haidian District, Beijing 100083, China. Email: [email protected]

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Thick Seam Mining Methods - Longwall Top Coal Caving ...

Thick Seam Mining Methods - Longwall Top Coal Caving Contact us. For more information, contact Dr Chengguo Zhang. E: [email protected] Australia has very large thick seam coal resources. As a result, there has been ongoing research conducted by the School and others into suitable mining methods that are capable of safe, efficient and ...

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