Project

longwall top coal caving shield

The Principle of Longwall Top Coal Caving (LTCC)

Apr 30, 2015· Caterpillar has extensive experience in the design of roof supports for specific mining conditions. Cat Longwall Top Coal Caving (LTCC) roof supports allow mining of seams seams thicker than 6

作者: Caterpillar Global Mining

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

· 翻译此页In China, the top-coal caving longwall mining began in the 1980s. The Chinese made FY4000/14/28 shield supports for the top-coal caving mining were installed on trials in In China, the top-coal caving longwall mining began in the 1980s. The Chinese made FY4000/14/28 shield supports for the top-coal caving mining were installed on trials in Puhe mine in Shenyang in June 1984. Due to its low strength, the shield׳s four-bar linkages were severely damaged.Cited by: 30

LONGWALL TOP COAL CAVING underground COAL

翻译此页equipment for a Longwall Top Coal Caving face. Photo courtesy of Joy Manufacturing Company Pty Ltd A brief description of longwall top coal caving (LTCC) is included at the equipment for a Longwall Top Coal Caving face. Photo courtesy of Joy Manufacturing Company Pty Ltd 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.

Ultra-thick Seam Longwall Mining in China | Coal Age

翻译此页Each caving shield has a door for drawing the broken top coal onto the rear AFC. Top coal drawing can either follow every longwall cut or every other or more cuts. The ratio of Each caving shield has a door for drawing the broken top coal onto the rear AFC. Top coal drawing can either follow every longwall cut or every other or more cuts. The ratio of mining height-to-top coal caving height ranges from one to three times the mining height at the bottom. The disadvantages of top coal caving are that the recovery rate

Longwall Installation and Salvaging techniques.

Nov 11, 2016· This video shows the longwall installation and salvaging technology used for Moonidih colliery. The Principle of Longwall Top Coal Caving (LTCC Typical Underground longwall coal mine

作者: Sai Yachendra

Principles of Longwall Mining

Apr 12, 2016· This video provides a basic description of the long-wall mining method for extracting coal underground. It includes an explanation of the different products/key components of a long-wall mining

作者: Wyoming Machinery Company

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

· 翻译此页Top-coal caving through the window of a shield was modeled. Figs. 16a and b present the modeling results of top-coal caving for a single shield along AA ’ and BB ’ cross-sections Top-coal caving through the window of a shield was modeled. Figs. 16a and b present the modeling results of top-coal caving for a single shield along AA ’ and BB ’ cross-sections perpendicular and parallel to the face, respectively. Each color (or tone) corresponds to a certain amount of vertical displacement in the figures.Cited by: 164

Cat | Customized Roof Support Systems | Caterpillar

翻译此页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 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 2.8-3.0 m (9.2-9.8 ft) and then caving the top coal behind the roof supports onto a rear AFC.[PDF]

Geotechnical Considerations for Longwall Top Coal Caving

2011 Underground Coal Operators’ Conference The AusIMM Illawarra Branch 10 – 11 February 2011 29 GEOTECHNICAL CONSIDERATIONS FOR LONGWALL TOP COAL CAVING 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

Fully Mechanized Longwall Coal Production

Feb 03, 2015· Fully mechanized Longwall Coal Production. Fully mechanized Longwall Coal Production. Skip navigation Sign in. The Principle of Longwall Top Coal Caving (LTCC) -

Longwall mining Wikipedia

Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6–1.0 m (2 ft 0 in–3 ft 3 in) thick). The longwall panel (the block of coal that is being mined) is typically 3–4 km (1.9–2.5 mi) long and 250–400 m (820–1,310 ft) wide.

[PDF]

Geotechnical Considerations for Longwall Top Coal Caving

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

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

Longwall Top Coal Caving (LTCC) Mining Technology

The Top Coal Caving is a Modified Longwall Mining system. Equipment Selection of Longwall Top Coal Caving Mining . The space behind the rear legs of the powered supports is large enough to allow lateral and vertical movements other goaf shield for control of caving.

longwall top coal caving Mining -- HOT mining 浩特矿业

The Top Coal Caving is a Modified Longwall Mining system. Equipment Selection of Longwall Top Coal Caving Mining The space behind the rear legs of the powered supports is large enough to allow lateral and vertical movements other goaf shield for control of caving.

Cat | Caterpillar to Supply Two Complete Longwall Top Coal

Longwall Top Coal Caving. 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

Longwall Shield Repairs | Swanson Industries

1:12 // Longwall Mine Shield Repair Process We have the capacity to perform complete or partial overhauls, based on equipment condition, within time frames to

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

Longwall Top Coal Caving Application Assessment in Australia

Longwall Top Coal Caving Application Assessment in Australia. and developed methods to understand the actual top coal breakage mechanism and the effect of various mining and shield parameters on the top coal caving operation. The project developed CFD models of LTCC faces to investigate gas accumulations and dust flows over the rear AFC area.

Longwall Mining an overview | ScienceDirect Topics

longwall mining Longwall mining is an underground method of excavating coal from tabular deposits, as well as soft mineral deposits such as potash. Large rectangular blocks of coal are defined during the development stage of the mine and are then extracted in a single continuous operation.

Viewpoint Mining Magazine Longwall Top-Coal Caving

Longwall Top-Coal Caving: A productive and efficient alternative. 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

Bi-Directional Shield Recovery in a Wide Face Longwall

Jan 01, 2007· Shield recovery in a longwall move is normally conducted from tailgate to headgate. However, if the face is wide and the immediate roof is weak, difficult conditions with considerable roof sag, excessive shield load, and local roof falls could occur as the shield recovery proceeds to the middle of the face, causing delays in shield recovery.

Theoretical analysis on the deformation characteristics of

Against the background of analyzing coal wall stability in 14101 fully mechanized longwall top coal caving face in Majialiang coal mine, based on the torque equilibrium of the coal wall, shield support and the roof strata, an elastic mechanics model was established to calculate the stress applied on the coal

[PDF]

Longwall Shield and Standing Gateroad Support Designs –

caving shield-lemniscate assembly has no vertical stiffness and does not contribute significantly to the rated shield capacity. The stiffness of the shield is a function of the stage extensions (all current shields are two-stage designs). In general, the stiffness of the shield reduces as the mining height increases due to the cylinder extension.

Viewpoint Mining Magazine Longwall Top-Coal Caving

Longwall Top-Coal Caving: A productive and efficient alternative. 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

Bi-Directional Shield Recovery in a Wide Face Longwall

Jan 01, 2007· Shield recovery in a longwall move is normally conducted from tailgate to headgate. However, if the face is wide and the immediate roof is weak, difficult conditions with considerable roof sag, excessive shield load, and local roof falls could occur as the shield recovery proceeds to the middle of the face, causing delays in shield recovery.

Theoretical analysis on the deformation characteristics of

Against the background of analyzing coal wall stability in 14101 fully mechanized longwall top coal caving face in Majialiang coal mine, based on the torque equilibrium of the coal wall, shield support and the roof strata, an elastic mechanics model was established to calculate the stress applied on the coal

[PDF]

Longwall Shield and Standing Gateroad Support Designs –

caving shield-lemniscate assembly has no vertical stiffness and does not contribute significantly to the rated shield capacity. The stiffness of the shield is a function of the stage extensions (all current shields are two-stage designs). In general, the stiffness of the shield reduces as the mining height increases due to the cylinder extension.

Longwall coal mining. Longwall shearer and roof support

The Principle of Longwall Top Coal Caving (LTCC). Fred, Big Arch Colliery. 1980. Hard Working Man Working Men Welsh Sayings Coal Miners Extinct Old And New The Past Arch Drawing. Walter Waygood THE FAMILY OF MINERS. Powered Roof Support on Tram. Amazing Modern Machinery.

[PDF]

Longwall Top Coal Caving Method for Barapukuria Coal

Longwall Top Coal Caving Method for Barapukuria Coal Field, Dinajpur, Bangladesh. Nadia Sultana Tarakki, Chowdhury Quamruzzaman, Mohammad Tofayal Ahmed, Md. Mizanur Rahman, Md. Badrul Alam, Chowdhury Rayhan . Abstract—The present research work deals with the coal extraction method for the Barapukuria Coal Field, Bangladesh. Various

[PDF]

Latest Developments in Longwall Mining Technology

supplying special shields for the longwall top coal caving method (LTCC), where extremely thick seams are being mined. This method utilizes a second AFC behind the shields to take the coal on top of the longwall outside of the face. Several such systems have been supplied and successfully installed in

Monitoring strata behavior due to multi-slicing top coal

For studying the strata behavior due to multi-slicing top coal caving longwall mining along-the-strike direction in steeply dipping extra thick coal seams, the shield support pressures of the upper and lower slices of panel 37220 in Dongxia Coal Mine were monitored using the KJ513 dynamic monitoring system.

Session Archives | Longwall USA

A Laboratory Investigation of Underside Shield Sprays to Improve Longwall Water Directional Spray System Randy Reed and Scott S. Klima, NIOSH, Pittsburgh Mining Research Division; Using Safety Climate Trends in the Coal Industry to Improve the Identification and Use of Leading Indicators

Cat | Caterpillar to Supply Two Complete Longwall Top Coal

Longwall Top Coal Caving. 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

Effect of Strata Conditions on Shield Pressure and Surface

Sep 24, 2018· The average horizontal distance behind the working coal face at which the maximum surface subsidence occurs is 92.1 m. On-site monitoring data are used to explain the causes of the unusual shield pressure and its relation to surface subsidence. Finally, guidelines to predict the shield pressure under similar conditions are provided.

[PDF]

Roof Support Systems Adobe

special chutes integrated into the gob shield, the front AFC or a second AFC located behind the shields. A large number of shield installations have been supplied to customers, particularly in central and eastern Europe. Longwall Top Coal Caving The Longwall Top Coal Caving (LTCC) roof support allows mining to a total seam height

Cat | Customized Roof Support Systems | Caterpillar

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 2.8-3.0 m (9.2-9.8 ft) and then caving the top coal behind the roof supports onto a rear AFC.

Effect of Strata Conditions on Shield Pressure and Surface

This paper presents a comprehensive analysis of roof strata conditions, shield pressure, and ground surface subsidence above Panel 42105 of the Buertai Coal Mine in Inner Mongolia, China. A 3D geological model and a 2D numerical simulation model are established to examine the roof strata structures with varying strata conditions. Numerical simulation results demonstrate that the hard rock 1