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The underground extraction of the thick coal seam with thickness in excess of 4.5 m is faced with operational, technical, safety and economic problems. Several …
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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 caving, especially in studies originating from China, is widely used in the production of inclined and thick coal seams.In this production method, in addition to the top coal …
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It is not used to describe the case of a large underground mine being developed by driving the mine access from a highwall or outcrop. Any method of mining could actually be used to extract coal in this way, but it has been included in the longwall section as the method has been developed for use with longwall equipment.
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AVOIDING AND CORRECTING PROBLEMS d) CORRECTION. face alignment & creep; excessive roof to floor closure; roof failure; equipment not performing correctly
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The Longwall Top Coal Caving (LTCC) method has greatly improved the production of ultra-thick underground coal resources. However, face fall and support closure have been becoming highly …
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Table 1 shows that the minimum thickness to be a thick seam is in the range of 3.0–4.8 m, the coal seam with a thickness over 3.5 m is considered as a thick coal seam in China. Based on the most advanced longwall mining technology, the coal seam with a thickness between 3.5 to 7 m is defined as the thick coal seam, and the coal seam …
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Longwall mining method is widely used for underground coal production in the world. Additional stresses occur surrounding the longwall during underground mining. ... employing top coal caving in ...
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Abstract The first caving of top coal and the first weighting of roof strata in Longwall Top Coal Caving (LTCC) mining were analyzed in a parametric study by using a discontinuum modeling technique with plastic rock material. The …
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top coal caving; automation; cutting methods; avoiding & correcting problems. exploration; preparation; observation; correction. face alignment & creep; ... Such examinations should be carried out for each longwall block, as far in advance of longwall operations as possible, to identify structures (which may or may not extend through the full ...
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The longwall top coal caving (LTCC) is a widely used method for producing thick coal seams. This method is applied in two different ways in steeply inclined thick coal seams by forming a longwall at the horizontal thickness of the seam and the slope of …
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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 ...
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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 …
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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 ...
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Though a longwall could be operated continuously to complete a block and the product stored on surface, it must be remembered that the coal is paid for when it is mined but does not provide income until sold or used. Storage on the surface is also an additional cost and in some cases coal quality deteriorates when stored in air;
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The longwall top coal caving (LTCC) is a widely used method for producing thick coal seams. This method is applied in two different ways in steeply inclined thick …
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1. Introduction and background. Longwall top coal caving (LTCC) technique has been widely used to mine thick (> 5 m) to ultra-thick coal seams.In a mechanised LTCC panel, the lower section of the coal seam is cut by a shearer supported by hydraulic shields, while the upper section of the worked seam is allowed to cave by …
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The Longwall Top Coal Caving (LTCC) method has greatly improved the production of ultra-thick underground coal resources. However, face fall and support closure have been becoming highly frequent accidents at the working face, and seriously threaten the safety of miners. The key to avoiding these problems is to reveal the structural evolution of the …
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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 …
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Longwall top coal caving (LTCC) is a highly efficient underground mining method that has recently been introduced and modified, and is now being used in underground coal mines in China. The major difference between LTCC and traditional longwall methods is that LTCC extracts caved coal from behind shields as well as from …
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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.
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The three methods mainly used worldwide in thick coal seams are longwall top coal caving (LTCC), multi-slice longwall (MSL), and, single pass longwall (SPL) methods.
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Abstract The new design of a powered roof support for the controlled longwall top coal caving in thick coal seams contains a special outlet and a reciprocating feeder. The introduction of such technology needs pre-testing and analysis of the outlet modes per the support units, such that to ensure the maximum allowable fill of the …
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The roadway formation process of non-pillar coal mining technology in longwall top coal caving panels: (A) the roadway excavation stage, (B) reinforce the support strength of the entry roof and entry rib, (C) split the roof of retained entry, and (D) support the roof and gangue rib of retained entry.
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Longwall Top-Coal Caving isn't just an alternative mining technique; it can be the difference between a productive, profitable mine and an unsustainable operation. The technology reduces waste and operating …
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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 …
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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
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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 systematic approaches ...
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Longwall with top-coal-caving method as applied at Omerler underground mine. 3. Caving mechanism in the top-coal-caving methodUndoubtedly, 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 …
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Longwall mining is currently the dominant coal extraction method in modern underground coal mines. On the basis of normal longwall system, Longwall Top Coal Caving (LTCC) method has been developed to extract thick coal seams of 5–12 m at one pass of the shearer (coal cutting machine).
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the coal haulage system cannot clear the coal from the mine at the same rate as the longwall can produce; each leg of the haulage system should have a capacity at least equal to and preferably slightly greater than the preceding section (storage bins can be used to separate sections, but underground bins are seldom large enough to contain …
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