longwall top coal caving process
Sensors
To control the problem of coal wall spalling in large mining height working faces subject to mining, considering the Duanwang Mine 150505 fully mechanized working face, the mechanism of coal wall spalling in working faces was investigated by theoretical analysis, numerical simulation and field experiment. Based on analysis of coal wall spalling in the
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The loose medium flow field theory and its application on the longwall
Because of the different distributions of running coal windows, there is a basic difference between the condition of the running ore ellipse ball and the running top coal process of top coal caving. The paper establishes a loose medium flow field theory on running top coal. It shows the true process of top coal flow on longwall top coal caving.
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Energies
Under the condition of fully mechanized top coal caving in close-distance coal seams, the surrounding rock of the stopping space easily loses stability during the withdrawal of mining equipment in the working face because the lower coal seam working face is located under the goaf and the overburden rock has a large range of complex interaction. Field investigation,
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Experiment on Space
08.11.2022Over the past three decades, a large number of scholars have studied from different aspects of longwall fully mechanized mining in steeply dipping medium thick coal seam, longwall fully mechanized caving mining in thick coal seam, and coal seam group mining under different mining methods of strata behavior(e.g., Luo et al., 2021; Sun et al., 2019; Wang et al.,
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Longwall Mining, 3rd Edition by Syd Peng Paperback Book
3 In particular, the longwall system can now run automatically cut by cut forever without operators' intervention provided that the geology allows it. Other health and safety features such as LASC, personal proximity detection, color lighting, automatic shield water sprays and remote shearer control are fully operational.
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Longwall Top Coal Caving Application Assessment in Australia
The Longwall Top Coal Caving (LTCC) method, which is being used successfully in China, offers a great potential for thick seam extraction in Australia. The LTCC method can be used to successfully extract up to 12 meters in thick seams. Production peaks up to 7 MT per face were reported in Chinese mines with this method.
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Energies
The weakening of hard coal–rock mass is the core common problem that is involved in the top coal weakening in hard and thick coal seams, the hard roof control during the initial mining stage in the longwall mining face, and the hanging roof control in the gob of non-coal mine. Based on the characteristics of pulse hydraulic fracturing and constant
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Energies
10.09.2020The present research primarily focuses on the investigation of gate-entry stability of longwall trial panel under weak geological condition in Indonesia coal mine by means of numerical analysis. This work aims at identifying appropriate roof support at 100 m and 150 m of depth during gate development. Due to depth depending competency of dominant rock, the
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Stress analysis of longwall top
In longwall top-coal caving (LTCC) mining, progressive failure process of top coal is closely related to the mining-induced stress. In order to achieve failure mechanisms of the top coal, stress distribution of the LTCC face adjacent to
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A discontinuum modelling approach for investigation of Longwall Top
25.04.2018This paper presents a discontinuum modelling approach to investigate Longwall Top Coal Caving (LTCC) behaviour including stress distribution, coal and rock failures, top coal caving
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Typical longwall mining with split
Download scientific diagram | Typical longwall mining with split-level gateroads top coal caving mining layouts (not to scale). (a) Plan view of LMSG panel layout. (b) Section view of LMSG layout
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Long wall top coal caving
15.11.20172. LONGWALL TOP COAL CAVING GENERAL INFORMATION • It is the modified method of longwall mining system • Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology in Australia at its
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Application of Longwall Top Coal Caving in Challenging
Longwall top coal caving (LTCC) techniques has been employed in favourable geological conditions widely in China since the mid-80s and in Australia recently. With the improvement of highly-powered face equipment and the method itself, in the past 15 years, LTCC was introduced to more challenging geological conditions, such as unfavourable roof
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Energies
08.08.2021As shown in Figure 1, LTCC extraction is mainly comprised of two processes, including progressive fracturing of intact top-coal and subsequent drawing of loose top-coal. Top-coal thickness is generally at a 1 to 3 times lower cutting height, which means improving the top-coal recovery rate is of great importance in LTCC mining.
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Prefeasibility study—Geotechnical studies for
01.07.2015Using 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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Optimizing Simulation and Analysis of Automated Top
As a major mature mining method used in thick coal seams, the longwall top-coal caving technique (LTCC) has been used in China for over 30 years for industrial testing and large-scale application [ 1, 2, 3 ].
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Energies
Under the condition of fully mechanized top coal caving in close-distance coal seams, the surrounding rock of the stopping space easily loses stability during the withdrawal of mining equipment in the working face because the lower coal seam working face is located under the goaf and the overburden rock has a large range of complex interaction. Field
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SMERE Longwall Top Coal Caving on the App Store
Read reviews, compare customer ratings, see screenshots and learn more about SMERE Longwall Top Coal Caving. Download SMERE Longwall Top Coal Caving and enjoy it on your iPhone, iPad and iPod touch. This app has been developed for the students of Minerals and Energy Resources Engineering (MERE) subjects at the University of New South Wales
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Theoretical description of drawing body shape in an inclined seam
： Understanding the characteristics of drawing body shape is essential for optimization of drawing parameters in longwall top coal caving mining.In this study,both physical experiments and theoretical analysis are employed to investigate these characteristics and derive a theoretical equation for the drawing body shape along the working face in an inclined seam.By analyzing
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Energies
The recovery rate of the fully mechanized longwall top coal caving mining face before and after hydraulic fracturing is shown in Figure 14. Before top coal hydraulic fracturing, the top coal caving block is large and is difficult to be recycled from the coal outlet, which resulted in a recovery rate of only 67%. After top coal weakening construction by combining pre-pulse and
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Optimizing Simulation and Analysis of Automated Top
A longwall top-coal cavability assessment criterion based on top-coal cavability rating (TCCR) was proposed by Vakili [ 12] to improve the overall understanding of the caving mechanism in LTCC technology.
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SMERE Longwall Top Coal Caving on the App Store
Read reviews, compare customer ratings, see screenshots and learn more about SMERE Longwall Top Coal Caving. Download SMERE Longwall Top Coal Caving and enjoy it on your iPhone, iPad and iPod touch. This app has been developed for the students of Minerals and Energy Resources Engineering (MERE) subjects at the University of New South
WhatsApp:+8617329420102
Sensors
To control the problem of coal wall spalling in large mining height working faces subject to mining, considering the Duanwang Mine 150505 fully mechanized working face, the mechanism of coal wall spalling in working faces was investigated by theoretical analysis, numerical simulation and field experiment. Based on analysis of coal wall spalling in the working face, a new grouting
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A calculation method of gas emission zone in a coal mine
Through measuring the volume of drilling cuttings from boreholes with a length of 10–15 m and a diameter of 42 mm, the stress zoning characteristics of roadway side coal body are obtained.The pressure relief zone is 0–4 m, the stress concentration zone is 4–12 m, and the original stress zone is more than 12 m deep.
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A calculation method of gas emission zone in a coal mine
Zhao et al. analysed the influence of the rate of advance of the roadway on the evolution of safe gas drainage channels in fractured overburden 14.Si et al. in order to establish a thorough understanding of gas pressure regimes, and gas emission patterns around a producing multi-level longwall top coal caving face, conducted a suite of in-situ measurements on seam gas
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Longwall Mining, 3rd Edition by Syd Peng Paperback Book
3 Since the last plow longwall mine was closed in 2018, the chapter on plow longwalling has been dropped and in its place Automation of Longwall Components and System is added. Also, a new chapter Longwall Top Coal Caving Mining (LTCC) is added due to its successful application in Australia since 2005.
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Sustainability
According to the continuity of strata, Syd S. Peng divided the longwall mining overburden into caved, fractured, and continuous deformation zones [ 40 ], as shown in Figure 1. The overburden movement caused by mining is finally transmitted to the surface.
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A particle
05.09.2019A 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 coal flow trajectories
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The Principle of Longwall Top Coal Caving (LTCC)
30.04.2015。Cat6（20
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Energies
10.09.2020Second is during longwall panel extraction. During this operation, a large portion of coal is excavated, which causes the roof above to fracture and fall down. This fractured zone is called the goaf area. This operation results in a huge stress redistribution to occur in the surrounding area.
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Energies
10.09.2020The present research primarily focuses on the investigation of gate-entry stability of longwall trial panel under weak geological condition in Indonesia coal mine by means of numerical analysis. This work aims at identifying appropriate roof support at 100 m and 150 m of depth during gate development. Due to depth depending competency of
WhatsApp:+8617329420102
Energies
The recovery rate of the fully mechanized longwall top coal caving mining face before and after hydraulic fracturing is shown in Figure 14. Before top coal hydraulic fracturing, the top coal caving block is large and is difficult to be recycled from the coal outlet, which resulted in a recovery rate of only 67%. After top coal weakening construction by combining pre
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Prediction of the stresses around main and tail gates during top coal
Initially, the uppermost slice, or Slice 1, having 3.5 m thickness is planned to be produced with the traditional longwall mining method. Following the production of uppermost slice, 13.5 m thick Slice 2 will be produced by the longwall top coal caving method. Fig. 2. Illustration of the planned mining scheme.
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longwall method
In the longwall system the ore body is divided into rectangular panels or blocks. In each panel two or more parallel drifts (for ventilation and ore transport) are driven along the opposite long sides to provide access,
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Optimizing Simulation and Analysis of Automated Top
The reserves and production of thick coal seams account for about 45% of underground coal resources and output in China. As a major mature mining method used in thick coal seams, the longwall top-coal caving technique (LTCC) has been used in China for over 30 years for industrial testing and large-scale application [1,2,3].However, because of the complex
WhatsApp:+8617329420102
Theoretical description of drawing body shape in an inclined seam
： Understanding the characteristics of drawing body shape is essential for optimization of drawing parameters in longwall top coal caving mining.In this study,both physical experiments and theoretical analysis are employed to investigate these characteristics and derive a theoretical equation for the drawing body shape along the working face in an
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