longwall top caving coal mining technology in india

Engineering practice and theoretical progress of top-coal caving mining

To explore a realistic top coal caving interval of the longwall top coal caving working face, longwall top coal caving panel 8202 in the Tongxin Coal Mine is used as an example, and 30 numerical ...

Longwall technology in india, SCCL | PDF

2. 160 A Retrospective Assesssment of Longwall Mining With A Focus on Successful Mechanised Underground Mining Technology production by mechanized Longwall mining in India is less than 4%. The expected demand for coal by 2011-12 is about 707 Mt; where as coal production would be around 550 Mt, leaving a gap of about …

Improving the top coal recovery ratio in longwall top coal caving

The 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 ...

A novel non‐pillar coal mining technology in longwall top …

Abstract. In longwall top coal caving (LTCC) mining methods, problems such as large deformations, loss of coal resources, and excavation relay out of balance …

(PDF) Thick Coal Seam Mining

The various challenges faced by India to apply Longwall mining includes, less . ... In addition, the mining technology for top-coal caving with a large mining height, the ground support technology ...

Optimization of Caving Technology in an …

Abstract. The 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 …

A novel non‐pillar coal mining technology in longwall top coal caving

In longwall top coal caving (LTCC) mining methods, problems such as large deformations, loss of coal resources, and excavation relay out of balance are often encountered with the increased production in single mining panels. To address these problems, a novel non-pillar coal mining technology in LTCC was used based on the …

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

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 [3].The major features of the top-coal caving mining are that a …

Design of an Optimum Longwall Face for Improved Ground …

Table 3 Ground control experiences at some longwall faces in India [43 ... Z. Li, H. Tu, Theoretical analysis on the deformation characteristics of coal wall in a longwall top coal caving face. Int. J. Min. Sci. Technol. 25(2 ... Techno-economic analysis of the need for a quantum jump in Indian coal mining technology. J. Min. Met. Fuels …

Critical Aspects of Longwall Top Coal Caving Method for

Request PDF | Critical Aspects of Longwall Top Coal Caving Method for Application in Indian Geomining Conditions | Although the future of coal mining lies belowground, the present status of Indian ...

Longwall top coal caving design for thick coal seam in very …

Fully mechanized LTCC mining method is a good recovery for ultra-thick coal seams especially seams above 7 m. Developing technologies increases the recovery rate for LTCC more than working in slice panels (Wang et al. 2015).Different drawing alternatives effect the recovery rate of the top coal as also outlined by Wang et al. (), and it proposed …

Motion Mechanisms for Top Coal and Gangue Blocks in Longwall Top Coal …

As shown in Fig. 1, longwall top coal caving (LTCC) is a main and widely used technology to extract thick and extra-thick coal seams.Its basic procedural is that the bottom coal seam is mined by the conventional longwall mining; the top coal is broken into loose blocks under the mining-induced stress and other factors, and then drawn out …

MINERAL MINING TECHNOLOGY Prefeasibility …

Abstract—Longwall Top Coal Caving (LTCC), a relatively newer technology in India, is an underground mining method developed for thick seam extraction. Various factors and …

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

The core topics of research in the top-coal caving mining are the mechanisms of top-coal caving and improvement of the top-coal recovery ratio. This paper summarizes the author's research results in the past two decades with the following conclusions: (1) The thickness of top-coal affects the recovery of top-coal. Generally …

Critical Aspects of Longwall Top Coal Caving Method for

Longwall top coal caving. Risks. Indian geo-mining conditions. 1 Introduction. In India, presently, thick seams up to a thickness of 4.5 m are effectively …

Theoretical description of drawing body shape in an inclined …

Understanding the characteristics of drawing body shape is essential for optimization of drawing parameters in longwall top coal caving mining. In this study, both physical experiments and theoretical analysis are employed to investigate these characteristics and derive a theoretical equation for the drawing body shape along the …

Longwall Top Coal Caving Mechanisms in the Fractured Thick Coal …

Associate Professor, Coal Industry Engineering Research Center of Top Coal Caving Mining, China Univ. of Mining and Technology, D11 Xueyuan Rd., Haidian District, Beijing 100083, China. Email: [email protected]

Critical Aspects of Longwall Top Coal Caving Method for

In case of longwall top, coal caving, the top coal shall fracture, fragment adequately, and cave down onto the rear conveyor immediately after advancing the power supports. Rocks in a mining area can fail in different ways, and it can have hazardous effects if in the form of roof and side falls or air blast in underground mine, bench slope in ...

Fully mechanized longwall top coal caving technology in …

The paper systematically summarized the main achievements of the fully mechanized longwall top-coal caving technology in passed 20 years in China and the conclusion and understanding on the related issues. The paper provided the issues of the theoretical and technical researches to be strengthened in the next step for the fully mechanized …

A novel non‐pillar coal mining technology in longwall top coal caving

equilibrium mining, large deformation control, longwall top coal caving, non ‐ pillar coal mining, retained entry Energy Sci Eng . 2023;11:1822 – 1841. 1822

Longwall Top Coal Caving (LTCC) Mining Technology

Not all the coal would be recovered, but recoveries of 75-80% of the full seam in the block are achievable. The system also allows the initial mining height to be reduced to a preferred working height without losing coal. The Top Coal Caving is a Modified Longwall Mining system. Equipment Selection of Longwall Top Coal Caving Mining

A Critical Review of Indian Underground Thick Coal …

morale for planning for thick seams extraction by longwall-based caving methods. Thus, the gap of safe and economic thick seam extraction from underground mining between India and other countries like China has remained unbridged. 1.9 It is pertinent to note that the longwall top coal caving

Application of Longwall Top Coal Caving in Challenging …

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 conditions, such as unfavourable …

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

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 ...

A review of cavability evaluation in longwall top coal caving

The longwall top coal caving (LTCC) is an efficient mining method to specifically extract thick or ultra-thick coal seams due to its good adaptability with respect to the large variations of coal ...

A new cavability assessment for Longwall Top Coal Caving …

1. Introduction. Longwall Top Coal Caving (LTCC) can provide substantially less economic sensitivity and a reduced level of technical risk over other thick seam mining methods. 1 A reliable evaluation of LTCC's applicability at the feasibility stage of a new mining project is therefore of importance to the effective and productive extraction of …