Request PDF | Drawing mechanisms for top coal in longwall top coal caving (LTCC): A review of two decades of literature | This review details the state of the art in research on top coal drawing ...
The study results show that the height of water-conduc- ting zone is 45. 7-46. 7 m,the height of caving zone is 16. 1 m. The fracture-mining ratio is 6. 87-7. 02 and the ca- ving-mining ratio is 2. 42 in longwall top-coal mining under thick coal seam (6. 65 m),and soft rock stratum and thick alluvium (102 m).
The longwall top coal caving (LTCC) production method, applied by forming a face in the horizontal thickness of the seam and also called horizontal section top coal …
Longwall top coal caving design for thick coal seam in very poor strength surrounding strata ... Wilson(1983) The stability of underground workings in the soft. rocks of the coal measures. Int ...
Panel 42105 of the longwall top coal caving (LTCC) operation is one of the panels in the 4–2 coal seam. It is extracted with the mechanized longwall retreat method. ... Lian XG (2016) Prediction model of dynamic subsidence caused by underground coal mining. Electron J Geotech Eng 21:6057–6068. Google Scholar Liu …
Longwall Top Coal Caving (LTCC), a relatively newer technology in India, is an underground mining method developed for thick seam extraction. Various factors and systematic approaches are to be considered and properly evaluated in order to qualify and gain confidence in the assessment of introducing LTCC mining method. The proposed …
Some Half Web systems can provide similar benefits to Pre-cutting, also described in the Longwall section of the Fundamentals of Coal Mining module, but with additional benefits. Depending on the equipment used and the mine's coal haulage capacity, Bi-di mining is often more productive than Uni-di, especially with longer faces, and can handle ...
Using longwall top coal caving (LTCC) in an extra-thick seam, many problems appear, such as large broken top coal blocks, frequent arch formation in the …
The changing mining conditions during longwall top coal caving mining (LTCC) were extracted from a coupled numerical model to provide statistically sufficient data for probabilistic analysis. ... Matsui K, Dou LM (2013) Seismic energy distribution and hazard assessment in underground coal mines using statistical energy analysis. Int J …
[Show full abstract] longwall top coal caving method was investigated. The very weak strength behavior of the coal and the surrounding strata increases the importance of research in the mine site ...
In the process of longwall top coal caving, the selection of the top coal caving interval along the advancing direction of the working face has an important eect on the top coal recovery. To explore a
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 …
INTRODUCTION. Those not familiar with longwall mining or equipment should first refer to the Longwall section of the Fundamentals of Coal Mining module of this web site and even for those who are familiar it may be worth referring to the specific items of interest in the Fundamentals of Coal Mining module as some parts contain information which leads …
Longwall mining is one of the most applicable and effective production methods for underground coalmines. Longwall mining is attractive for producers due to its high production rate (Galvin 2016).Mechanized longwall mining requires heavy machinery and equipment that are shearer for coal cutting, hydraulic shields for roof control, and …
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 …
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.
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 …
In the longwall mining method, mine development is carried out in such a manner that large blocks of coal, usually 100 to 300 metres wide and 1,000 to 3,000 metres long, are available for complete extraction (see photograph).A block of coal is extracted in slices, the dimensions of which are fixed by the height of coal extracted, the width of the longwall …
DOI: 10.1016/J.IJMST.2017.06.021 Corpus ID: 115563572; A review of cavability evaluation in longwall top coal caving @article{Le2017ARO, title={A review of cavability evaluation in longwall top coal caving}, author={Tien Dung Le and Rudrajit Mitra and Joung-Bae Oh and Bruce Hebblewhite}, journal={International journal of mining science …
Underground coal seam gas drainage is a widely used method for lowering the risk of gas outburst [6] [7] [8], and pressure relief drilling is one of the most effective methods to release high ...
ABSTRACT In longwall top-coal caving (LTCC) mining, progressive failure process of top coal is closely related to the mining-induced stress. In order to achieve failure mechanisms of the top coal, stress distribution of the LTCC face adjacent to the gob is analysed in this study with field investigation and numerical simulation. The …
1. Introduction. 87.4% of the world's energy supply in 2020 was provided from non-renewable energy sources such as oil, coal, natural gas and nuclear energy. 1 Although the supply of energy is increasing day by day, the fact that the energy resources are exhaustible has brought the efficient production of energy resources to an important …
Longwall Top Coal Caving was initially developed in the former Soviet Union and France in the 1950s and 1960s. It was then applied in the former Yugoslavia, Hungary, Romania, the former Czechoslovakia and Turkey [4], [5], [6].The 'Soutirage' method which was developed in France in the 1960s is considered as the original form …
DOI: 10.1016/j.ijrmms.2022.105304 Corpus ID: 254718060; Investigation of the effect of caving height on the efficiency of the longwall top coal caving production method applied in inclined and thick coal seams by physical modeling
LONGWALL MINING Overview. In the method of secondary extraction known as longwall mining a relatively long mining face (typically in the range 100 to 300m but may be longer) is created by driving a roadway at right angles between two roadways that form the sides of the longwall block, with one rib of this new roadway forming the longwall face.
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. ... Indian has extensive underground thick coal reserves of 5–12 m thick suitable for the application of LTCC. There is considerable experience from LTCC mining under ...
This study investigates the feasibility of rock bolting support in an underground coal mine gallery with a thick coal seam. The Ömerler underground coal mine working area, owned by the West Lignite Enterprise (GLI) of the Turkish Coal Enterprises (TKI), was selected for this purpose. Longwall top coal caving (LTCC) is …
Therefore, it is not possible to carry out an efficient production operation unless caving of top coal behind the face is optimized. In this paper, results of 3-D modelling of the top coal caving mechanism at the M3 longwall panel of Omerler Underground Mine located at Tuncbilek (Turkey) are presented by using a finite difference code called ...
The recovery ratio of longwall top coal caving (LTCC) technology is an important measure of its effectiveness. However, the recovery ratio of single-opening sequential caving …
The longwall top coal caving (LTCC) ... Underground coal mining has a strong disturbance on surrounding rock strata, causing inevitable water inflow into mined spaces, which seriously affects ...
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