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The automatic control of top coal caving is of great significance to realize intelligent coal mining In the process of top coal caving a coal gangue mixed area containing coal gangue and air is formed at the tail beam of the hydraulic support which has different electromagnetic parameters different volumes and different shapes
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In top coal caving mining the bottom 4 m ft of the seam is extracted by the conventional longwall mining method and the remaining roof top coal is naturally caved behind the shield
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The excavation of an underground coal seam by longwall caving or longwall top caving coal mining LTCC causes strata movement and fracture and forms caving fractured and continuous deformation zones Peng and Chiang 1984 Sui et al 2024 The voids and fractures in the caved and fractured rock mass provide seepage channels for water and coalbed gas Cover stress re establishment has a
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To upgrade the longwall mining system Longwall Top Coal Caving LTCC method was adopted on 08 May 2024 for extraction of coal from Barapukuria coal mine Productivity has been enhanced significantly after introduction of this method Under this method coal is extracted at a higher rate by mining out slices of 3 meter cutting height from front AFC and those of 2 meter caving height from rear
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The structure of multikey strata during coal mining is found to have an impact on coal pillars burst occurrence as well Tulu et al Feng G Wang P Simulation of recovery of upper remnant coal pillar while mining the ultra close lower panel using longwall top coal caving Int J Min Sci Technol 2024 30 55 61 [Google Scholar] Wang X Guan K Yang T Liu X Instability
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It is intended to provide an introduction into the longwall top coal caving LTCC mining method through an interactive simulation A 360 degree view is provided of the cutting sequence at a hypothetical LTCC face
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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
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Dust is a major concern in coal disasters In longwall top coal caving LTC faces Figure 1 dust problems be come more serious because of unlimited dust sources large amounts of coal dusts are generated during mine support advancing and top coal caving Water injection is an effective method to suppress dust Figure 1 A typical LTC
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Both longwall systems are designed for longwall top coal caving in a coal seam with an average thickness of 25 meters 82 feet Caterpillar is the leading supplier for the coal producing industry
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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 The thick coal seam mining technique is a significant advance in underground coal mining and has
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Based on the present level of fully mechanized top coal caving technology this article analyzed main reasons that influence the output of fully mechanized top coal caving face expounded the conception of higher mining height in fully mechanized top coal caving technology and pointed out that this is the important method to reach 10 million tons per year in fully mechanized top coal caving face
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The fully mechanized top coal caving mining method was used to mine the 15 m thick No 3 5 seam at a depth of 450 m in Tongxin mine located in the Datong area China The seam was overlain with strong strata that are hard to cave and four partially mined coal seams Excessive mine roadway closure and severe ground conditions at the longwall face and the tailgate were induced by periodic
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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 conventional longwall equipment has not yet been designed to operate successfully beyond around 5m mining height
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According to the results by considering all factors it was found that Longwall Top Coal Caving LTCC method would be a preferred and alternative method for mining in seam VI s stage III
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Compaction characteristics of the caving zone in a longwall goaf a review Cun Zhang Broken rock and coal—residual coal plus material from the immediate roof and overlying strata—fill in the goaf in an area termed the caving zone Due to its high porosity and permeability the caving zone contains gas and water which may have originated from the mined coal seam the adjacent
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In order to study the fracture patterns of hard main roof in longwall top coal caving LTCC with large mining height a two dimensional physical similarity model was created to simulate the mining process of No 8100 large mining height face in Tongxin coal mine China
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Longwall top coal caving LTCC mining technology is a pro ductive and economical method to extract thick coal seams and thus is widely used in many coal mines in China Wang 2024 Wang et al 2024 Although some hypotheses on top coal draw ing process were proposed Wang and Fu 2024 Wang et al 2024 2024 2024 Unver and Yasitli 2024 Vakili and Hebblewhite 2024 Karekal et al
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Request PDF Prevention of water and mud inrush in longwall top coal cave mining under shallow buried thin bedrock During longwall top coal caving mining of shallow buried thin bedrock and
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3D numerical modeling of longwall mining with top coal caving By Bahtiyar Ünver Investigation into the behaviour of a support system and roof strata during sublevel caving of a thick coal seam By Tarunraj Singh Analysis of Roof Caving Characteristics at a Coal Mine by Using Full Scale 3D Numerical Modeling By Mehmet Ali Hindistan Tercan Bahtiyar Ünver and Güneş Ertunç
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Longwall Top Coal Caving LTCC is an improved longwall mining technique that has shown many advantages compared with other methods in terms of coal recovery rate face equipment design development cost and spontaneous combustion control for extracting coal seam with thickness in excess of m Hebblewhite et al 2024
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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 analysis demonstrated that an increase in the value of cover depth decreases the stability of main roof strata while the impact of horizontal stress on the main roof strata
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Longwall top coal caving LTCC is a comparatively new method for mining thick coal seams LTCC currently has reached high production and efficiency in longwall mining mostly in China The procedure is almost the same as the traditional longwall mining method
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Longwall top coal caving mechanisms and cavability optimization with hydraulic fracturing are analysed in this study Based on the geological and geotechnical conditions of the Dongzhouyao coal mine it is revealed that top coal failure mechanisms are dominated by both compressive and tensile stresses Ahead of the face line shear failure initiates at the lower level of the top coal and
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During longwall top coal caving mining of shallow buried thin bedrock and thick coal seams penetrating fractures may form in the rock strata above the roof causing an inrush of water and sand at the working face The 507 working face of the Madiliang Coal Mine in Inner Mongolia China is a shallow buried thin bedrock and thick coal seam mined by longwall top coal caving mining The eld
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applied 3D numerical modelling to longwall mining with top coal caving The study showed that maximum vertical abut ment stresses were formed at a distance of 7 m in front of the face An analysis of the conditions of top coal has revealed that a m thick layer of coal just above the shield supports is well fractured However a m thick layer of coal above the fractured part is
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longwall coal mining activity This report was commissioned by the Department of the Environment on the advice of the Independent Expert Scientific Committee on Coal Seam Gas and Large Coal Mining Development The review was prepared by Jacobs Group Australia with input from Mine Engineering Subsidence Consultants and Strata Control Technology August 2024 Monitoring and management of
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This app has been developed for the students of Minerals and Energy Resources Engineering MERE subjects at the University of New South Wales UNSW Australia It is intended to provide an introduction into the longwall top coal caving LTCC mining method through an interactive simulation A 360 …
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help of hydrofracturing According to the results by considering all factors it was found that Longwall Top Coal Caving LTCC method would be a preferred and alternative method for mining in seam VI s stage III of Barapukuria Coal Mine It will increase recovery ratesup to 75% which will contribute additional support to further new power
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Longwall top coal caving technology has developed rapidly in China in recent years 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 40% Using standard longwall equipment annual production can reach 3 million metric tons Mt and a maximum of Mt has been obtained many top coal
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The longwall top coal caving method with retreat mining is used for winning coal The thickness of coal is m the coal cutting height by shearer is m and the top coal caving height is m Roof strata are naturally collapsed behind shields The drum of the shear is m meaning that the m coal is cut for each web The shearer
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