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Analysis of the Influence Characteristics of the Support

Z. Zhang, J. Bai, Y. Chen, and S. Yan, "An innovative approach for gob-side entry retaining in highly gassy fully-mechanized longwall top-coal caving," International Journal of Rock Mechanics and Mining Sciences, vol. 80, pp. 1–11, 2015. View at: Publisher Site | Google Scholar

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Technology

Technology. We are a coal mining company with an eye on the future, combining cutting edge technologies with a diverse mix of coal products from open cut and underground mine operations. 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

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Longwall Top Coal Caving Mechanisms in the Fractured Thick

Aug 08, 2020· Effect of Key Parameters on Top Coal First Caving and Roof First Weighting in Longwall Top Coal Caving: A Case Study International Journal of Geomechanics March 2020 Dynamic Distribution of Voidage in Longwall Coal Mining-Disturbed Strata

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Simulation of Recovery of Upper Remnant Coal Pillar While

Jan 01, 2019· If ultra-close coal seams are mined at a great mining height at once, for instance, using longwall top coal caving—a longwall mining method that is widely used in China for the mining of ultra-thick coal seams—then the location and characteristics of the band would have a significant influence on success of their extraction."

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Key technologies and equipment for a fully mechanized top

China, the top-coal caving mining method means the fully mechanized longwall top-coal caving mining method. A longwall panel is laid out at the bottom of the thick coal seam and extracted using a fully mechanized longwall mining method. At the same time, the remaining coal above the longwall face are fractured by ground stress and strain

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full-mechanized-longwall-coal-mining-steeply-inclined-coal

> Longwall Top Coal Caving (LTCC) Mining Technology > Steeply Inclined Seam Longwall Mining > Technology of Pipe Belt Conveyor > Gold CIP Production Line, the 5th Coal Mining Team began to install the first face end support.The mine director Chen Shengming personally attended the command,but when the support is lowered to 28 meters below

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On the strong earthquakes induced by deep coal mining

Oct 20, 2021· Yu et al. revealed the fracture process of overlying strata in longwall top coal caving (LTCC) mining according to the characteristics of microseismic activity in Tashan coal mine. The fracture evolution characteristics of the overlying strata and the mechanism of energy storing and releasing were investigated, and by

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Coal Zoom

May 01, 2015· Seam height is 8 to 10 meters, but Whitehaven determined that extending the longwall face—to as wide as 400 meters—will be more cost effective than would mining shorter face widths with longwall top coal caving techniques.

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Journal of Rock Mechanics and Geotechnical Engineering

Based on the loose medium flow field theory, the loose top-coal drawing law of longwall top-coal caving (LTCC) mining technology is studied by using self-developed three-dimensional (3D) test device. The loose top-coal drawing test with shields and the controlled test without shields are performed in the condition without any boundary effect.

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Article: Long-term time-dependent consolidation analysis

Apr 07, 2016· Abstract: Longwall top coal caving (LTCC) is one of the mining methods used in thick coal seams. Large subsidence occurs over the coal mines, where this method is utilised for production. The area affected by subsidence differs due to varying limit angles of .

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

Oct 01, 2014· Oct 01, 2014· The top-coal caving longwall mining is one of the major mining methods for extracting thick coal seams in China. The top-coal caving mining was estimated to have produced about 0.6 billion metric tons every year, accounts for 18% of underground coal mining in China .The major features of the top-coal caving mining are that a conventional longwall mining with cutting .

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Numerical Modelling of Stress-Strain Analysis in

Apr 13, 2018· Coal has been produced by means of longwall retreat with the top-coal-caving production method where a 3 m high longwall face was operated at the floor of the coal seam (Fig. 4). Top- slice coal having a thickness of 5 m was caved and produced through windows located at the top of .

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CN102536239A

The invention discloses a long-wall working face coal pillar-free mining method which comprises the following steps of: (1) digging an upper gate road tunnel and a lower gate road tunnel; (2) reinforcing a roof plate of the lower gate road tunnel, and drilling an energy collecting hole for presplitting blasting on the roof plate; (3) recovering till that a gob is formed; (4) blasting in

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longwall top coal caving process

Today, the top-coal caving longwall mining is the major mining method for thick seam coal mining in China. In the Datong coal district, the annual production is 1.5 million metric tons per panel. The top-coal caving longwall mining has attained outstanding achievements in coal mines with favorable conditions.

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Surface stepped subsidence related to top-coal caving

...of longwall mining with top-coal caving. 3D numerical modeling of longwall mining withdif?culties related mainly to top-coal caving.The average depth below surface is approximately. . Surface subsidence: The overburden is disturbedLongwall face move Steps: pre-move preparation,Longwall Top Coal Caving?Longwall Top coal.... Intro_Longwall_Mining_and_Subs

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IOP Conference Series: Earth and Environmental Science

Apr 04, 2020· Longwall top coal caving (LTCC) mining technologies with roof softening by hydraulic fracturing method V Klishin, S Nikitenko and G Opruk-Analysis of Influence of Goaf Sealing from Tailgate On the Methane Concentration at the Outlet from the Longwall Magdalena Tutak and Jaroslaw Brodny-

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Support working resistance determined on top-coal caving

Oct 30, 2019· Taking top-coal caving mining face (TCCMF) as research object, this paper considers the combination of top-coal and immediate roof as cushion layer to build the solution model of support resistance based on the theory of elastic foundation beam. Meanwhile, the physical and mechanical properties of coal-rock combination influencing on strata behaviors is explored.

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Geotechnical considerations for longwall top coal caving

The introduction of Longwall Top Coal Caving (LTCC) to this environment has aided in the management of some of these issues, but has also given rise to other geotechnical considerations. associated with LTCC not only require management during operations but also require consideration when evaluating new mining areas at Austar or potential

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OptimizationofCavingTechnologyinanExtrathickSeamwith

e optimization of top coal caving technology is an efficient method to improve the recovery ratio in longwall top coal caving (LTCC). In extrathick coal seams, the conventional single-opening sequential caving technology (SOSCT) shows the following problems: low recovery ratio, high rock mixed ratio, and poor drawing balance.

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Analysis of the Influence Characteristics of the Support

Z. Zhang, J. Bai, Y. Chen, and S. Yan, "An innovative approach for gob-side entry retaining in highly gassy fully-mechanized longwall top-coal caving," International Journal of Rock Mechanics and Mining Sciences, vol. 80, pp. 1–11, 2015. View at: Publisher Site | Google Scholar

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Peabody, Yanzhou sign top coal caving deal in Qld

Aug 11, 2011· Peabody, Yanzhou sign top coal caving deal in Qld. China's Yanzhou Coal, the only miner conducting longwall top coal caving in Australia .

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Longwall Top Coal Caving ~ Mining Engineering Science

May 26, 2017· 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 Mining Method and Design

May 30, 2018· Longwall mines produce more than 30 pct of all underground coal, up from 5 pct just 15 years ago. The continued growth of longwall mining without appropriate ple-seam planning may increase the cost and risk of mining. Optimization of the mine design factors is arguably the primary means for controlling interactions between operations. The

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On the strong earthquakes induced by deep coal mining

Oct 20, 2021· Yu et al. revealed the fracture process of overlying strata in longwall top coal caving (LTCC) mining according to the characteristics of microseismic activity in Tashan coal mine. The fracture evolution characteristics of the overlying strata and the mechanism of energy storing and releasing were investigated, and by

Get Price

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. It enables an increased recovery for only an incremental

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The Principle of Longwall Top Coal Caving (LTCC)

Dec 13, 2016 - Caterpillar has extensive experience in the design of roof supports for specific mining conditions. Cat Longwall Top Coal Caving (LTCC) roof supports allow m...

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How does Longwall Top Coal Caving work? LTCC Mining

Jul 19, 2018· 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 .

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Longwall mining

Longwall mining is a form of underground mining in which a long wall of coal is sliced from the face of the mine. Filters for the underground The potential bridge failure did not come about because of a natural occurrence, but rather is one side effect of longwall mining, a coal extraction method that has been gaining popularity in

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Analysis of the Influence Characteristics of the Support

Z. Zhang, J. Bai, Y. Chen, and S. Yan, "An innovative approach for gob-side entry retaining in highly gassy fully-mechanized longwall top-coal caving," International Journal of Rock Mechanics and Mining Sciences, vol. 80, pp. 1–11, 2015. View at: Publisher Site | Google Scholar

Get Price

Underground Mining Method.to be submitted.docx

The longwall mining method has the simplest system layout and provides continuous production and full potential for automation, which can further improve productivity and personnel health and safety. The panel layout is simple and conducive to good ventilation, and crews always work under protective supported roof. Since the longwall system with full caving leaves a lesser amount of residual

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Research on the Ground Pressure Features of Long Wall Top

May 21, 2021· Based on the raw data of shield pressure and overlying strata movement measured in the field, the ground pressure features and overlying strata movement were analyzed in 8202 extra-thick coal seam longwall top coal caving working face of Tongxin coal mine after its extraction. The research results show that: during the process of mining, the interval of the lower sub key strata caved for the

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Caving pioneers

Nov 24, 2007· The top coal caving method is very similar to conventional longwall mining at the front end. "However, the caving technologies at the back are .

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Geotechnical Considerations for Longwall Top Coal Caving

Figure 3 - Longwall top coal caving system GEOTECHNICAL CONSIDERATIONS FOR LONGWALL TOP COAL CAVING Development and installation roadways . The development process at Austar is no different to that of a traditional longwall mining operation. The normal development roadway dimensions are < 5.2 m wide x 3.2 m high, these dimensions are at the

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Datong orders Cat® AFC system for Longwall Top Coal Caving

Apr 05, 2017· Caterpillar will supply a complete longwall top coal caving (LTCC) armored face conveyor system to Majialiang coal mine, Datong Coal Mine Group. This system will be the fifth set of Cat ® LTCC face conveyors delivered to the mine. In the LTCC arrangement, the armored face conveyor (AFC) system has one conveyor in front of the roof supports to

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Three-dimensional experimental study of loose top-coal

Longwall top-coal caving (LTCC) mining technology is a pro-ductive and economical method to extract thick coal seams, and thus is widely used in many coal mines in China (Wang, 2009; Wang et al., 2014). Although some hypotheses on top-coal draw-

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Deep Q-Network for Optimal Decision for Top-Coal Caving

the top-coal caving are hard or even impossible to obtain. This is one of the key issues for automating the windows actions. For this reason, at present, the research of top-coal caving focuses on optimizing the process technology and most of it usd 2D simulation based on .

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