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WebMay 1, 2016 This work proposed a progressive-sectional failure model (PSFM) based on Particle Flow Code (PFC) to simulate top coal drawing process in longwall top coal caving (LTCC) mining. The progressive-sectional fracturing of top coal was reproduced in simulation. 4 drawing schemes are numerically performed by considering drawing
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WebMay 1, 2018 The effective operation of the longwall complex depends on the coordinated work of powered roof support, face conveyor and shearer. Therefore, as usual, integrated automation systems are used that ...
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WebAs 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
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WebStudy on gob-side entry retaining in fully-mechanized longwall with top-coal caving and its application Su Haia,b, Bai Jianbiaoc,d,, Yan Shuaic, Chen Yongc,d, Zhang Zizhengc,d a School of ...
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WebStudy on gob-side entry retaining in fully-mechanized longwall with top-coal caving and its application Su Haia,b, Bai Jianbiaoc,d,, Yan Shuaic, Chen Yongc,d, Zhang Zizhengc,d a School of ...
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WebA SEMINAR ON. LONGWALL TOP COAL CAVING Presented by J. Anil M.Tech-219MN1581 Department of Mining Engineering, NIT Rourkela, Odisha INTRODUCTION Long wall top coal caving (LTCC) is the method of extraction for underground mining of thick seam, i.e. greater than4.5m. It uses a long wall setup and natural forces to aid in
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WebMar 16, 2020 The study confirmed that an increase in the value of immediate roof rock strength, coal strength, coal elastic modulus, and coal bedding spacing improves the stability of top coal before its first caving, whereas an increase in the value of top coal thickness, cover depth, and horizontal stress magnitude facilitates the commencement of
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WebLongwall mining. New York Wiley 1983 5 Cai Y, Hebblewhite B, Onder U, Xu B, Kelly M, Wright B, et al. Application of longwall top coal caving to Australian operations. CSIRO-ACARP report C110402003 6 Poulsen BA. Evaluation of software code UDEC for modelling top coal cavin in an Australian environment.
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WebJun 1, 2018 Introduction. Longwall Top Coal Caving (LTCC) is considered one of the most efficient methods for mining thick coal seams. 1 The LTCC method divides a thick coal seam into two sections including lower or cutting section and upper or top coal section. The lower section is mined by the conventional longwall method while the top coal section is
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WebNov 1, 2019 The field application showed that reasonable roof presplitting parameters could achieve satisfactory effects at pressure relief and retained entry in the longwall top-coal caving panel.
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WebA review of cavability evaluation in longwall top coal caving Tien Dung Le, Rudrajit Mitra, Joung Oh, Bruce Hebblewhite School of Mining Engineering, The University of New South Wales, Sydney ...
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WebAug 25, 2021 In the process of longwall top coal caving, the deformation and movement of the overlying hugely-thick conglomerate stratum (HTCS) directly affects the rock pressure behavior in the longwall. Based on conditions of the geology and mining of coal face 13,180 at Gengcun coal mine of Yima Mining Area, China, numerical and similar
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WebSep 28, 2021 Longwall top coal caving mining is a special type of mining method, which is usually used to mine coal seams with a thickness of more than 4.5 m 1.Because longwall top coal caving mining has ...
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WebFeb 1, 2005 Evaluation of Top Coal Yielding Potential in Longwall All Top Coal Caving Mining. B. Oraee-Mirzamani. Engineering. 2014. Longwall Top Coal Caving (LTCC) is a method of extraction for underground mining of thick coal seams. This method, being a combined version of Longwall and Sublevel caving methods, has a higher.
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WebMar 14, 2020 equipment in longwall top coal caving method (LTCC) with coal discharge to face conveyor. The application of the proposed schemes lessens the influence of the human factor, prevents coal dilution, eliminates conveyor overloading, decreases workload of shearer operator in face area and reduces the probability of making errors by
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WebAug 25, 2021 In the process of longwall top coal caving, the deformation and movement of the overlying hugely-thick conglomerate stratum (HTCS) directly affects the rock pressure behavior in the longwall. Based on conditions of the geology and mining of coal face 13,180 at Gengcun coal mine of Yima Mining Area, China, numerical and similar
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WebSep 28, 2021 Longwall top coal caving mining is a special type of mining method, which is usually used to mine coal seams with a thickness of more than 4.5 m 1.Because longwall top coal caving mining has ...
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WebFeb 1, 2005 Evaluation of Top Coal Yielding Potential in Longwall All Top Coal Caving Mining. B. Oraee-Mirzamani. Engineering. 2014. Longwall Top Coal Caving (LTCC) is a method of extraction for underground mining of thick coal seams. This method, being a combined version of Longwall and Sublevel caving methods, has a higher.
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WebMar 14, 2020 equipment in longwall top coal caving method (LTCC) with coal discharge to face conveyor. The application of the proposed schemes lessens the influence of the human factor, prevents coal dilution, eliminates conveyor overloading, decreases workload of shearer operator in face area and reduces the probability of making errors by
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WebAug 24, 2020 The geometric similarity ratio C D between the simulation and field-measured parameters was set to 1 100. The similarity ratios of the volumetric weights of rocks and coal were C -Rock 1 1.56 and C -Coal 1 1, respectively. Based on a large number of tests and simulations, the ground pressure similarity theory was developed 24, 25,
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WebEvaluation of LTCC in Australia Hebblewhite amp Cai, UNSW Mining Research Centre 3 Figure 1. Conceptual Model of LTCC System (after Xu, 1999) Figure 2. Typical LTCC Face Support (note articulated ...
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WebJun 30, 2020 The influence of dirt band on the top coal caving property is usually analyzed from the thickness and hardness of the dirt band. For the extra-thick coal seam with a thickness of more than 20 m, the location of the dirt band also has a huge impact on the top coal caving property. In this paper, No. 19 coal seam of Tanyaoyu coal mine is
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WebThe aim of this project was to provide the Australian underground coal mining industry with an up to date, state of the art summary of the Longwall Top Coal Caving (LTCC) mining system and its potential for application in Australia. In supporting the project, ACARP requested that the project focus on summarising the status of the LTCC system ...
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WebJan 1, 2016 Longwall Top Coal Caving application assessment in Australia, ACARP Project C13018. Itasca Consulting Group, 2014. UDEC Universal Distinct Element Code v6.00 users manual.
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WebUsing 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 drawing process, poor balance of drawing ...
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WebAug 16, 2021 An extraction method for deep-seated thick seam deposits by underground mining with high resource recovery has remained a great challenge for Indian mining engineers, whereas the longwall top coal caving (LTCC) method has evolved as an effective method for various geo mining conditions in China and other counties. The
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WebTraditionally, longwall top coal caving (LTCC) panels adopt the singlewindow ... granular flow model for topcoal caving and a new research system for topcoal drawing.3,5,27,31 This new
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WebJul 1, 1999 The application of longwall top-coal caving can double both the productivity and the efficiency of a working face and reduce the cost of production by 30 to 50%. Using standard longwall equipment, annual production can reach 3 million metric tons (Mt), and a maximum of 4.1 Mt has been obtained many top-coal caving longwall working faces
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WebAug 28, 2020 Longwall mechanized top coal caving mining (LMTCCM) in extra-thick coal seams has its own characteristics. The law of mining pressure and overlying strata failure height in extra-thick coal seams are much larger than those of medium-thick and thick coal seams. The key stratum structure morphology also has an important influence
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WebMay 1, 2016 This work proposed a progressive-sectional failure model (PSFM) based on Particle Flow Code (PFC) to simulate top coal drawing process in longwall top coal caving (LTCC) mining. The progressive-sectional fracturing of top coal was reproduced in simulation. 4 drawing schemes are numerically performed by considering drawing
Read More
WebFeb 1, 2023 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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WebSep 5, 2019 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
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WebTop 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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WebSep 26, 2021 An extraction method for deep-seated thick seam deposits by underground mining with high resource recovery has remained a great challenge for Indian mining engineers, whereas the longwall top coal ...
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WebApr 26, 2021 A study into the feasibility of application of longwall top coal caving (ltcc) method in indian geo mining conditions. 1 Int. Conf. on Deep Excavation, Energy Resources and Production DEEP16 24-26 November 2016, IIT Kharagpur, India A STUDY INTO THE FEASIBILITY OF APPLICATION OF LONGWALL TOP COAL CAVING (LTCC)
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Web9 longwall system. Longwall top coal caving (LTCC) is a part of longwall mining that is 10 applicable for thick coal seams. China is an important country, which has best practices of ... Furthermore, application 4 of conventional mechanized longwall mining was investigated for seam-C as an auxiliary 5 purpose of the study. 6 2. Brief Geology of ...
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WebFeb 12, 2023 From a risk and operational assessment, the Longwall Top Coal Caving (LTCC) method is considered the most appropriate method for the Quangninh mining sit-uation. The LTCC method, original referred to as the soutirage method, o ers great potential for the e cient extraction of thick seams by caving coal from the
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WebMay 1, 2018 The effective operation of the longwall complex depends on the coordinated work of powered roof support, face conveyor and shearer. Therefore, as usual, integrated automation systems are used that ...
Read More
WebAs 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
Read More
WebStudy on gob-side entry retaining in fully-mechanized longwall with top-coal caving and its application Su Haia,b, Bai Jianbiaoc,d,, Yan Shuaic, Chen Yongc,d, Zhang Zizhengc,d a School of ...
Read More
WebStudy on gob-side entry retaining in fully-mechanized longwall with top-coal caving and its application Su Haia,b, Bai Jianbiaoc,d,, Yan Shuaic, Chen Yongc,d, Zhang Zizhengc,d a School of ...
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