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developed mature in technology and employed in production for thickseam deposits. These methods include: MultiSlice Longwall, High Reach Longwall (single slice) and Longwall Top Coal Caving (LTCC). LTCC can mine out a seam varying from 4 to 20m in a single
Apr 30, 2015#0183;#32; has extensive experience in the design of roof supports for specific mining conditions. Cat Longwall Top Coal Caving (LTCC) roof supports allow m...
How it works. In traditional longwall mining, the shearer travels along the face of the coal seam, cutting as it goes and dropping coal onto an armored face conveyor (AFC) that carries it to a belt or crusher. When a cut is complete, the whole system moves forward one step at a time until the seam is finished.
Mar 01, 2019#0183;#32;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 thick coal seams. The evaluation of LTCC''s applicability technically refers to
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. Despite the fact that there are numerous coal seams in Australia which are thick enough for LTCC to be used to increase recoveries, potentially at a reduced cost/tonne, there has been little application of the process to date.
Viewpoint Mining Magazine Longwall TopCoal Caving
Longwall topcoal caving technology has developed rapidly in China, in recent years. The application of longwall topcoal The application of longwall topcoal caving can double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 40o/o.
LONGWALL TOP COAL CAVING DESCRIPTION . Longwall Top Coal Caving (LTCC) is an enhanced form of the conventional longwall recovery system, whereby a rear Armoured Face Conveyor (AFC) (refer to Figure 3) is utilised to extract coal from behind the powered supports that would otherwise be left unrecovered in thick seam environments. The major
Nov 15, 2017#0183;#32;The top slice is placed so that there is 5m of coal left above the supports. This top slice(first longwall face) is advanced as an ordinary longwall operation, leaving 5m of coal overhead. The overhead coal is allowed to cave with the roof. The second longwall face is then started off(6 12months) later at the foot of the seam using the basic Top Coal Caving(TCC) method.
Aug 08, 2020#0183;#32;Abstract. In this study, the finite difference method (FDM) coupled with a discrete fracture network (DFN) was utilized to analyze longwall top coal caving (LTCC) behaviors. The integrated FDMDFN model enabled the influence of the preexisting fracture, stress redistribution, stress rotation, caving material compaction, and periodic rupture of roof strata to be superimposed on the failure
The preferred mining method for these thick coal seams is the Longwall Top Coal Caving (LTCC). The connection of both the top coal caving and its compactness are still rare; therefore, the capability of top coal caving mechanism is the most significant factor in LTCC that must be adequately explained and examined. Moreover, in order to achieve the ideal coal production, a comprehensive modeling of
A 3D particlebased 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 faceend
Longwall top coal caving (LTCC) is a special type of longwall mining applicable to very thick seams (greater than ) where good quality coal is being left because quot;conventionalquot; longwall equipment has not yet been designed to operate successfully beyond around 5m mining height. It enables an increased recovery for only an incremental additional cost.
The basic procedure is that when the drawn volume of top coal from a support reaches about half, the next support begins drawing top coal, and the drawing process between the two supports is half done.
In this method, the LTCC face is arranged perpendicular to the striking and advances along the striking direction horizontally. The sublevel interval is the height of one cutting and one caving. A rational increase in height of the interval (or mining to caving ratio)
Developed in China, top coal caving uses a modified long wall mining system. LTCC allows the excavation of thick coal seams of 5 to 12 metres at one pass of the longwall machine, generating high productivity and economic returns for an operation.
Longwall mechanized top coal caving mining (LMTCCM) in extrathick coal seams has its own characteristics. The law of mining pressure and overlying strata failure height in extrathick coal seams are much larger than those of mediumthick and thick coal seams. The key stratum structure morphology also has an important influence on the law of overlying strata movement and stability of
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