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The average coal seam thickness was approximately 15.3 m. Fully mechanized top-coal 89 caving mining method was employed. The coal was cut to a height of 3.9 m while the top coal caving 90 height averaged 11.4 m. ZF/15000/27.5/42 hydraulic supports were used. No.5404 and No.5105 Undoubtedly, caving of naturally fractured or blasted top coal under gravity is the most critical factor in determination of mining method-related parameters such as geometry and dimensions of longwall panel, face support and production scheduling. Top coal usually caves in the form of blocks of various dimensions or small particles and dust. Therefore, a very heterogeneous particle-size

CN101666230A

The invention discloses a coal mining method of a lengthened front-beam fully-mechanized mining and fully-mechanized top coal carving of a three-soft coal seam and an equipment. The invention is characterized in that the front end of the expansion front end of a fully-mechanized mining hydraulic bracket is provided with the lengthened front beam, a hydraulic cylinder of the expansion front

The invention discloses a coal mining method of a lengthened front-beam fully-mechanized mining and fully-mechanized top coal carving of a three-soft coal seam and an equipment. The invention is characterized in that the front end of the expansion front end of a fully-mechanized mining hydraulic bracket is provided with the lengthened front beam, a hydraulic cylinder of the expansion front

In top-coal caving, the window control of hydraulic support is a key issue to the perfect economic benefit. The window is driven by the electro-hydraulic control system whose command is produced by the control model and the corresponding algorithm. However, the model of the window's control is hard to establish, and the optimal policy of window action is impossible to calculate.

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 of the hydraulic support beam is an ideal location

The method is similar in some respects to sublevel caving—the ore is mined from the top downward by a series of slices, and the overlying strata cave and follow the mining downward with a mat intervening between the caved overburden and the ore beneath. The methods differ, however, in that in top slicing the slice is mined right up to the floor of the caved slice above, whereas in sublevel

Longwall Top Coal Caving Mining . We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment. And they are mainly used to crush coarse minerals like gold and copper ore, metals like steel and iron, glass, coal, asphalt, gravel

Steep Seam Mining

Steep Seam Mining. 2013-2-21rsingh12yahoo Thick Seam Mining and Strata Mechanics Department 4 Mining technology Steep coal seams with competent rock mass formations adopted different Mining methods like inclined slicing horiontal slicing cross slicing by lonwall mining method in singlemulti-lift working with stowing experienced limited success

Steep Seam Mining. 2013-2-21rsingh12yahoo Thick Seam Mining and Strata Mechanics Department 4 Mining technology Steep coal seams with competent rock mass formations adopted different Mining methods like inclined slicing horiontal slicing cross slicing by lonwall mining method in singlemulti-lift working with stowing experienced limited success

The mining method relies on the fracturing of the top coal by the front abutment pressure to achieve satisfactory caving into the rear conveyor. This paper develops a yield and caveability criterion based on in situ conditions in the top coal in advance of the mining face (yield) and behind the supports (caveability). Yielding and caving effects are combined into one single number called

2017-9-22top-coal caving technology is a productive and efficient method in modern mechanized coal mining, the study of coal-rock recognition is key to realizing automation in comprehensive mechanized coal mining in this paper we propose a new discriminant analysis framework for coal-rock recognitionn the framework, a data acquisition model with vibration and acoustic signals is designed and the.

The large mining height fully mechanized top-coal caving mining technique has developed rapidly and become the most extensively used mining method for ultra-thick coal seams. 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

Block caving has emerged as a cost-effective method of mining large, low-grade mineral deposits. The role of block caving. Although the caving mining system was initially used for shallow orebodies, it has recently been applied at depths of 2km underground. According to Suorineni, "caving heights have also increased drastically from about

A coal mining method where pillars of coal are left behind to support the ceiling as chambers and rooms in the coal seam are excavated. Also known as the room and pillar method. Also known as the room and pillar method. Get Price. bord and pillar mining method . The bord and pillar method is a dominant method in coal pillar geometry is a key issue for the success of bord and pillar mining

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. International Mining Team Publishing Ltd 2 Claridge Court, Lower Kings Road Berkhamsted, Hertfordshire

「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.

A novel short‐wall caving zone backfilling technique for

In summary, filling mining in the short‐wall caving zone, which is suitable for thin coal seam mining, is a supplementary method to existing mining techniques, with advantages of high recovery rates, low cost, and simple material delivery. Admittedly, there are a few limitations should be noticed. Firstly, the proposed technology has been only used in thin coal seam mining. If applied in

In summary, filling mining in the short‐wall caving zone, which is suitable for thin coal seam mining, is a supplementary method to existing mining techniques, with advantages of high recovery rates, low cost, and simple material delivery. Admittedly, there are a few limitations should be noticed. Firstly, the proposed technology has been only used in thin coal seam mining. If applied in

2011 Underground Coal Operators' Conference The AusIMM Illawarra Branch 10 – 11 February 2011 29 GEOTECHNICAL CONSIDERATIONS FOR LONGWALL TOP COAL CAVING AT AUSTAR COAL MINE Adrian Moodie1and James Anderson ABSTRACT: Austar Coal Mine has had a long association with difficult strata control conditions associated with depth of mining and a highly jointed/cleated coal

top-coal caving or slicing mining method to extract these thick seams may result in distinct geomechanical responses in the strata and, in turn, the pattern of rockburst occurrence around longwall layouts. In order to establish a thorough understanding of which method (caving or slicing) is better when it comes to preventing rockbursts during the extraction process, a suite of in situ

「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.

Coal mining is known as a dangerous and dirty profession. The downside was due to reduced customer demand and a longwall move at Harvey mine. Total costs in first-quarter 2019 were $62.7 million, down 11.5% from $70.9 million in the year-ago quarter Lano 3 lark 3 lartua 1 larus 2 lasita 2 laso 3 laura 2 lazia 9 lenar 3 leo 2 lesla 2 leva 8 lilit 4 lion 2 liria 2 lofi 6 loka 8 lond 5 longwall 2

Peabody licences Longwall Top Coal Caving for North Goonyella Posted by Matrix on 22nd August 2011 Peabody Energy has come to a new licensing agreement with Yanzhou Coal Mining Co for the installation of its Longwall Top Coal Caving (LTCC) technology to enhance recovery of metallurgical coal at Peabody's North Goonyella mine in the Bowen Basin, Queensland, Australia.

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 little application of the process to date. It is

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. International Mining Team Publishing Ltd 2 Claridge Court, Lower Kings Road Berkhamsted, Hertfordshire

The Top Coal Caving methodology is the most efficient and effective for the extraction of these thick coal seams. The Longwall Top Coal Caving (LTCC) is an underground mining method that is gradually developed and accepted in the recent years. This method has turn into the key method for thick coal seams and getting better results in China. However, recent attention by many researchers has

The Top Coal Caving methodology is the most efficient and effective for the extraction of these thick coal seams. The Longwall Top Coal Caving (LTCC) is an underground mining method that is gradually developed and accepted in the recent years. This method has turn into the key method for thick coal seams and getting better results in China. However, recent attention by many researchers has

top coal caving mining method . AS a leading global manufacturer of crushing and milling equipment, we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete stone crushing plant.

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 strata to be superimposed on the failure process of

Fully mechanized top coal caving mining is the effectiveaccess to solve difficult problem sinthick seam mining[J]. Coal Science and Technology, 2005, 33 (2): 1–6 (in Chinese). [5]Yan Shaohong. Theory study on the load on support of long wall with top coal caving with great mining height in extra thick coal seam[J]. Journal of China Coal Society, 2009, 34 (5): 590–593 (in Chinese). [6]Yu

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