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An innovative gateroad layout in highly gassy longwall top coal caving in a Chinese coal mine based on gob-side entry retaining (GER) was introduced. The numerical model was used to design the rational roadside backfill body (RBB) with high-water quick-setting materials. In order to improve the reliability of the numerical modeling, the double ...
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TOP CAVING. Longwall Topcoal Caving (TCC) is a method of extraction for underground mining of thick seams. It uses a longwall set-up and natural forces to aid in the winning of coal. With this method of extraction only a single longwall is developed at the foot of the seam. The control of the roof layers at the face is by means of powered supports.
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The modern longwall mining method was first developed in the early 1970s when the first shield supports were introduced. Since that time, all components of a longwall system have been considerably upgraded in areas such as installed power, conveyor chain speed and capacity, structural integrity, and — first and foremost — automation.
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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, …
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ordinary longwall. As opposed to ordinary longwall, it is more challenging to control the dust at a safe level all the time. Typically, for a LTCC operation, the airborne dust is mainly sourced from (a) coal cutting activity – accounting for about 60%, (b) caving activity – about 25%, (c) support operation –
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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 التعدين نارابري الفحم عمليات Pty Ltd. تعدين الفحم - الفحم شفافة حول Longwall التعدين, الفحم, تعدين الفحم, التعدين, القط, نارابري, هيتهفن الفحم, الطبول, الرياضية الأمثل
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Longwall top-coal caving technique and its application in thick coal seams with complicate conditions. Beijing: Coal Industry Press. Google Scholar. Wang, J. H., B. Yu, H. P. Kang, G. Wang, D. Mao, Y. Liang, and P. Jiang. 2015. "Key technologies and equipment for a fully mechanized top-coal caving operation with a large mining height at …
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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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DOI: 10.1134/S1062739148010157 Corpus ID: 128946710; Analysis of geomechanical changes in hanging wall caused by longwall multi top caving in coal mining @article{Likar2012AnalysisOG, title={Analysis of geomechanical changes in hanging wall caused by longwall multi top caving in coal mining}, author={Jakob Likar and Milan …
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Longwall top coal caving (LTCC) technology is one of the effective methods for extracting thick and extra-thick coal seams. Since it is introduced into China in 1982, …
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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 …
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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 …
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Efficient coal/gangue recognition is vital to improve the top coal recovery in thick seam mining with the longwall top coal caving method. Gangue is a gray-black rock mixed into the top coal flow during the drawing process. Liquid intervention is a new approach to distinguish coal and gangue based on their temperature difference through ...
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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 gravity and be collected …
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TABLE 6. VALUES OF VERTICAL STRESS FOR STAGE II AND III EXCAVATION. At present in Barapukuria Coal Mine, seam VI has been excavated in two stages, stage I with Longwall method, where, 3m of coal is kept as top coal of 2.8m's excavation. In stage II, 3 m coal is exca-vated with LTCC method with 3 m top coal.
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The longwall top coal caving (LTCC) mining method to be employed at the Eynez East underground coal mine is a special type of longwall mining applicable to seams thicker than 6 meters (20 feet ...
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Top coal caving technologies is not a novelty. The first experimental tests of top coal caving were undertaken well before engineering of longwall mining systems and hydraulically-powered shield-type roof supports. In the USSR experiments with top coal caving in the supported area of roadways were initiated in the 1930s [1].
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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 from …
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This paper presents an investigation on the interactions of overburden failure zones induced by the mining of adjacent coal seams using the longwall caving method. Overburden failure is an important factor in safety assessments in the fields of mining engineering geology and safety geology, especially when mining under water …
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Longwall top-coal caving technique and its application in thick coal seams with complicate conditions. Beijing: Coal Industry Press. Google Scholar. Wang, J. H., B. …
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Longwall top coal caving (LTCC) is a relatively new method of mining thick coal seams that is currently achieving high productivity and efficiency in application, particularly in China. The ...
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The amount of coal for the production panel must be high enough to cover the initial investment of the mechanized longwall system. Longwall top coal caving (LTCC) …
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Longwall Top Coal Caving (LTCC) is a modified longwall mining method for efficient extraction of the thick coal seams. The major difference between LTCC and the traditional longwall method is the extraction of the caved coal from behind the shields as well as the sheared face (Fig. 1).The method has been widely implemented by the …
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A 3D particle-based 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 face-end support were considered. The shape of drawing body and top coal boundary and the distribution characteristics of coal loss were analysed. The top …
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Keywords Longwall top coal caving · Large dip angle · Thick coal seam · Dynamic sublevel caving · Drawing mechanism 1 Introduction After 40 years of development since the longwall top coal caving (LTCC) was introduced into China in 1982, rich achievements and experience have been obtained both in technology and in theory.
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Longwall top coal caving (LTCC) is a special type of mining method commonly used to extract coal seams thicker than 4.5 m (Wang et al. 2018a).This method originated in France and Eastern Europe in the 1950s for extracting coal pillars from marginal areas of coalfields (Wang et al. 2014).LTCC is … See more
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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 …
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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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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 …
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The mechanics of support and caving in longwall top-slicing. *,g. D. F. COATES and M. GYENGE. Department of Minesani Te+Erentcat Surveys, Ottawa, Canada INTRODUCTION The work described in this paper was done as part of a cooperative research project with a mining company that was in the process of examining various …
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2018. Longwall top-coal caving (LTCC) has been a popular, more productive and cost-effective method for extracting thick (> 5 m) to ultra-thick coal seams in recent years. However, low-level recovery ratio…. Expand. 1. PDF. 1 Excerpt. Semantic Scholar extracted view of "Improving coal recovery from longwall top coal caving" by Apurna Ghosh et al.
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DOI: 10.1016/J.IJRMMS.2015.05.009 Corpus ID: 131678260; In situ investigations into overburden failures of a super-thick coal seam for longwall top coal caving @article{Yu2015InSI, title={In situ investigations into overburden failures of a super-thick coal seam for longwall top coal caving}, author={Bin Yu and Jun Zhao and Tiejun …
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Field and numerical investigations of gateroad system failure induced by hard roofs in a longwall top coal caving face @article{Bai2017FieldAN, title={Field and numerical investigations of gateroad system failure induced by hard roofs in a longwall top coal caving face}, author={Qingsheng Bai and Shi-hao Tu and Fangtian Wang and Cun …
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The geomechanical model of the powered roof support-top coal-roof rock system is developed. For investigation of disintegration processes in top coal of thick seam, numerical modeling with finite element discretization of a study domain is carried out using the authors' original code. The computational experiment reveals stress distribution in …
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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 effect …
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