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Stress analysis of longwall top coal caving

Read Stress analysis of longwall top coal caving International Journal of Rock Mechanics and Mining Sciences on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips

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Recognition of rock–coal interface in top coal caving

This paper provides a novel rock-coal interface recognition method based on stacked sparse autoencoders (SSAE) Given their different size and hardness coal and rock generate different tail beam vibrations Therefore the rock-coal interface in top coal caving can be identified using an acceleration sensor to measure such vibrations The end

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Comparison of rockburst occurrence during extraction of

10-10-2018In recent years rockbursts have occurred frequently during the mining of thick coal seams in China Use of the top-coal caving or slicing mining method to extract these thick seams may result in distinct geomechanical responses in the strata and in turn

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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 []

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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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top coal caving Archives

When the top coal caving method was initially employed at Broadmeadow it was the company's first mine in Queensland to use it Employing this method was expected to lift recoveries from around 60% to 90% in the Goonyella Middle Seam and increase production rates it said in a 2013 briefing

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longwall top caving coal mining technology in Brazil

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 height

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top coal caving roof supports north goonyella

Coal extracted from seams up to 12 feet thick via multiple mining methods –Longwall and longwall top-coal caving –High-efficiency "super sections" using continuous miners and battery haulage for room-and-pillar mining –Mobile roof supports and continuous miners to extract pillars 11

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coal by ALINA FER

What is Top Coal Caving (TCC) and how does it differ from traditional long wall mining? The Top Coal Caving Method (TCC) is very similar to traditional long wall mining but differs in that it enables more coal to be collected that would otherwise fall into the 'goaf'

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top coal caving longwall maximizes thick seam recovery

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 45m) where good quality coal is being left because conventional longwall equipment has not yet been designed to operate successfully beyond around 5m mining height It

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Radiation characteristics of natural gamma

recognition in top coal caving Abstract Recognition of coal and gangue (roof rock) is a key technology to realize fully mechanized top coal caving automated mining This paper proposes to detect the instantaneous refuse content of drawn coal and gangue mixture during top coal caving by using natural gamma-ray technology

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Top Coal Caving Longwall Maximizes Thick Seam

What is Longwall Top Coal Caving? Due to the inherent operational problems and high costs associated with the multi-slicing longwall method and the legislative requirement from the central government of a 93% (minimum) recovery rate LTCC was introduced to the Chinese coal industry in 1982 (based on the European soutirage methods)

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Both longwall systems are designed for longwall top coal caving (LTCC) in a coal seam with an average thickness of 25 meters (82 feet) is the leading supplier for the coal producing industry in Turkey with four out of five longwall underground mining systems in operation

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longwall top caving coal mining technology in india

A coal seam of 4 5 m or greater is classified as a thick seam in China prompted the development of longwall top coal caving (LTCC) technology in 1982 Free Chat 3D numerical modeling of longwall mining with top-coal caving 3D numerical modeling of longwall mining with top-coal caving

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Longwall Top Coal Caving Technology

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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Roof Support Systems

Longwall Top Coal Caving The Longwall Top Coal Caving (LTCC) roof support allows mining to a total seam height of more than 10 m (33 ft) by using a longwall shearer to cut the bottom 2 80 – 3 m (9 20 – 9 80 ft) and then caving the top coal behind the roof supports onto a

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top coal caving mining method

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 by ACARP titled Evaluation of the application of the LTCC method in Australia

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The Principle of Longwall Top Coal Caving (LTCC)

The Principle of Longwall Top Coal Caving (LTCC) - YouTube Jul 2 2019- The Principle of Longwall Top Coal Caving (LTCC) - YouTube Visit The drill technology What others are saying May 11 Thru May 14 Mining Jobs Careers Ontario Canada Here is a longwall shear in operation

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IMPROVED MECHANISED EXTRACTION TECHNOLOGIES IN UNDERGROUND

IMPROVED MECHANISED EXTRACTION TECHNOLOGIES IN UNDERGROUND HARDCOAL MINES FROM JIUL VALLEY-ROMANIA Radu Sorin Mihai 1 Iosif Andras 2 1Ph D Professor 2Ph D Professor University of Petrosani 1 ABSTRACT The paper deals with the analysis of the technical economical and geological-mining issues of the top coal technology widely used

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Top

Top-coal caving structure and technology for increasing recovery rate at extra-thick hard coal seam PANG Yi-hui 1 2 WANG Guo-fa 1 (1 Coal Ming and Designing Department Tiandi Science Technology Co Ltd Beijing China 100013) (2 Coal Mining Design Branch China Coal Research Institute Beijing China 100013)

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Characteristics of Strata Behavior during Thick Seam

fully-mechanized top coal caving (FMTCC) face in a thick coal seam in a loess-covered gullied region by field measurement and theoretical analysis A comparative analysis was performed to examine how the attitude of surface gullies and the structure of overburden affect face support resistance

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Top coal caving longwall maximizes thick seam recovery

23-7-2019Austar's longwall system offers opportunities in coal seams thicker than 4 5 meters The Longwall Top Coal Caving (LTCC) method was recently launched in Australia at Yancoal Australia's Austar mines in Hunter Valley although 90 such longwalls already operate in China The article describes the

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Research on Fully Mechanized Top—coal Caving Mining

3.Research on support technology of fully mechanized top—coal caving The first fully mechanized top-coal caving working face for experiment was named 8 1 02 working face which were three normal faults in the mining range and the influence of length was 560 m and 1 1 0 m in width.There which to production couldn't be neglected.So

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top coal caving roof supports north goonyella

Coal extracted from seams up to 12 feet thick via multiple mining methods –Longwall and longwall top-coal caving –High-efficiency "super sections" using continuous miners and battery haulage for room-and-pillar mining –Mobile roof supports and continuous miners to extract pillars 11

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top coal caving mining method

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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Dynamic random arching in the flow field of top

The arching of coal/gangue and the drawing out of gangue are peculiar phenomena in the process of fully mechanized top-coal caving mining which not only affects the recovery of top-coal but also affects the quality of the coal This paper studies the arching phenomenon in top-coal caving mining process of ultra-thick coal seam

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Top Coal Caving Mining Method

Recognition of rock–coal interface in top coal caving Top coal caving mining technology is widely used to mine thick coal seam because of the approach's advantages of high production high efficiency low energy consumption low cost and strong adaptability Chat With Sales Caving Underground Mining Methods (longwall Sublevel

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Article Theoretical equation of initial top

Abstract The theoretical equation of initial top-coal boundary (ITCB) is one of the fundamental problems of top-coal drawing law in longwall top-coal caving (LTCC) mining The granular mechanical model of ITCB is established based on loose medium flow field theory

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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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