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top coal caving mining method

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

The top-coal caving mining method, developed steadily in the past two decades, has become the main method for thick seam coal mining in China. In recent years, the core research areas in the top-coal caving mining are the mechanisms of top-coal caving and the improvement of top-coal recovery ratio.

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Top Coal Movement Law of Dynamic Group Caving

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 ...

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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

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FILLING MINING METHOD FOR FULLY-MECHANIZED TOP

1. A filling mining method for a fully-mechanized top coal caving working face, comprising the following steps: at step A, dividing the fully-mechanized top coal caving working face into a filling zone and a top coal caving zone along a strike of the working face, wherein lengths of the filling zone and the top coal caving zone are equal to a strike length of the working face, a sum of widths ...

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Longwall Top Coal Caving (LTCC) technology -

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 an operation. The

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Force chains in top coal caving mining - ScienceDirect

2020-3-1  Fully mechanized top coal caving mining involves two mining processes, cutting coal seam at the working face and recovering the caved top coal at the rear support. Focused on the characteristics and evolution of force chains in overlying strata and top coal, top coal caving mining is generally simulated by using different advancing distance.

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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

2020-11-4  53 Mining Safety of Longwall Top-coal Caving in China Jian Wu, 1 Yueping Qin, 1 and Minghua Zhai1 1China Univ. of Mining and Technology, 011# Xueyuan Road, Haidian Dist, Beijing 100083, P.R. of 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

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Systems of Mining - ore, coal, slicing, caving, method ...

2011-11-15  Systems of Mining. system of mining in which the distinguishing feature is the winning of 50 per cent or more of the coal in the first working. The coal is mined in rooms sepa rated by narrow ribs or pillars. The coal in the pillars is won by subsequent working which may be likened to top slicing in which the roof is caved in successive blocks.

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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.

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

Longwall top coal caving (LTCC) mining technologies with roof softening by hydraulic fracturing method. V Klishin 1, S Nikitenko 1 and G Opruk 1. Published 1 May 2018 •

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FILLING MINING METHOD FOR FULLY-MECHANIZED TOP

1. A filling mining method for a fully-mechanized top coal caving working face, comprising the following steps: at step A, dividing the fully-mechanized top coal caving working face into a filling zone and a top coal caving zone along a strike of the working face, wherein lengths of the filling zone and the top coal caving zone are equal to a strike length of the working face, a sum of widths ...

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Ground Control Principals for Longwall Top Coal Caving

2018-10-29  Longwall top coal caving (LTCC) is a comparatively new method for mining thick coal seams. LTCC currently has reached high production and efficiency in longwall mining mostly in China. The procedure is almost the same as the traditional longwall mining method.

Read More
Longwall Top Coal Caving (LTCC) technology -

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 an operation. The

Read More
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 ...

Read More
Mining Safety of Longwall Top-coal Caving in China

2020-11-4  53 Mining Safety of Longwall Top-coal Caving in China Jian Wu, 1 Yueping Qin, 1 and Minghua Zhai1 1China Univ. of Mining and Technology, 011# Xueyuan Road, Haidian Dist, Beijing 100083, P.R. of 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

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Systems of Mining - ore, coal, slicing, caving, method ...

2011-11-15  Systems of Mining. system of mining in which the distinguishing feature is the winning of 50 per cent or more of the coal in the first working. The coal is mined in rooms sepa rated by narrow ribs or pillars. The coal in the pillars is won by subsequent working which may be likened to top slicing in which the roof is caved in successive blocks.

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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

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顶煤放落过程煤矸声信号特征提取与分类方法

2021-11-3  Feature extraction and classification method of coal gangue acoustic signal during top coal caving[J]. Journal of Mining Science and Technology, 2021, 6(6): 711-720. doi: 10.19606/j.cnki.jmst.2021.06.010 Citation: Yuan Yuan, Wang Jiawen, Zhu Desheng, Wang ...

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The longwall top coal caving method for mining thick

Download scientific diagram The longwall top coal caving method for mining thick seams [1] from publication: Effect of the size distribution of granular top coal on the drawing mechanism in LTCC ...

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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.

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

Longwall top coal caving (LTCC) mining technologies with roof softening by hydraulic fracturing method. V Klishin 1, S Nikitenko 1 and G Opruk 1. Published 1 May 2018 •

Read More
Ground Control Principals for Longwall Top Coal Caving

2018-10-29  Longwall top coal caving (LTCC) is a comparatively new method for mining thick coal seams. LTCC currently has reached high production and efficiency in longwall mining mostly in China. The procedure is almost the same as the traditional longwall mining method.

Read More
(PDF) Research on Top Coal Caving Technique in Steep

A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. The coal extraction technologies for coal seams less than 14 m thick were ...

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FILLING MINING METHOD FOR FULLY-MECHANIZED TOP

1. A filling mining method for a fully-mechanized top coal caving working face, comprising the following steps: at step A, dividing the fully-mechanized top coal caving working face into a filling zone and a top coal caving zone along a strike of the working face, wherein lengths of the filling zone and the top coal caving zone are equal to a strike length of the working face, a sum of widths ...

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Quantitative Evaluation of Top Coal Caving Methods at the ...

2021-4-10  The top coal caving method is a systematic combination of caving sequence and caving amount, and it possesses a major effect on the top coal recovery in the working face. The current selection process of top coal caving methods is mainly based on physical similarity simulation and empirical control from field tests.

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Mining Safety of Longwall Top-coal Caving in China

2020-11-4  53 Mining Safety of Longwall Top-coal Caving in China Jian Wu, 1 Yueping Qin, 1 and Minghua Zhai1 1China Univ. of Mining and Technology, 011# Xueyuan Road, Haidian Dist, Beijing 100083, P.R. of 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

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A Brief Comparison of Longwall Methods Used at Mining

2009-9-17  In comparison with top coal caving method, the slicing method is of lower output, higher production cost and less safety (Xu, 2001). From the economic point of view, investment costs for the panel in MSL are twice higher than at the LTCC method

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顶煤放落过程煤矸声信号特征提取与分类方法

2021-11-3  Feature extraction and classification method of coal gangue acoustic signal during top coal caving[J]. Journal of Mining Science and Technology, 2021, 6(6): 711-720. doi: 10.19606/j.cnki.jmst.2021.06.010 Citation: Yuan Yuan, Wang Jiawen, Zhu Desheng, Wang ...

Read More