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2 天之前 介绍. 长壁开采是一种地下采煤方式，其中将长壁煤开采成单片（通常为 0.6 至 6.0 米（2 英尺 0 英寸至 19 英尺 8 英寸）厚）。. 长壁板（正在开采的煤块）通常长 3-4 公
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Longwall mining is an efficient and a high production mining method; a single longwall face can produce more than 25 000 tons of coal per day. Health and safety measures often
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2023.11.9 Longwall mining is a primary method for extracting coal from underground mines. As shown in Figure 1, three kinds of mining equipment used in the longwall face
узнать больше2018.11.16 This paper is organised as follows: “Roof-cutting unloading: a new method of longwall coal mining” is devoted to the presentation of both the conventional
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Longwall Mining, 3 rd edition will be of interest to professionals and academics in the field of mining engineering specifically, serving both as a reference work and an (under)graduate textbook, but will also interest
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doi/10.1002/ese3.1424. In longwall top coal caving (LTCC) mining methods, problems such as large deformations, loss of coal resources, and excavation relay out of
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An Innovative Longwall Mining Technology in Tangshan Coal Mine, China by Jingli Zhao 1, Pengfei Wang 1,2,* and Yue Su 1 1 College of Resource and Safety Engineering, China University of Mining and Technology
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2017.8.28 basic mining methods to be considered in the present category are longwall mining in hard rock, longwall coal mining, sublevel caving and block caving. In
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2016.11.1 Longwall mining is one of the two most popular mining methods of underground coal mining, the other being room and pillar (or bord-and-pillar) mining. The
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2022.9.13 Fractures in the overburden induced by mining disturbances provide channels for heat-mass exchange between the subsurface environment and ground surface. Void fraction is an important characterization parameter to determine the difficulty of fluid flow and heat transfer. The three-dimensional stochastic distribution characteristics of the
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2014.10.10 In recent years, field trials of non-pillar longwall mining using complete backfill have been implemented successively in the Chinese coal mining industry. The objective of this paper is to get a scientific understanding of surface subsidence control effect using such techniques. It begins with a brief overview on complete backfill methods
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2009.8.5 Longwall mining is the most common of the underground coal mining methods used in Australia. It suits sites where coal seams are thicker, wide and have a consistent coal profile with gentle dip. In
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2 天之前 最新的 长壁采矿 Longwall Mining 科学新闻、研究评论和学术文章。 Academic Accelerator 最完整的百科全书。 长壁采矿的基本理念是 17 世纪后期在英国发展起来的。矿工们沿着采煤工作面的宽度切开煤层，清除落下的煤并使用木柱来控制工作面后面的顶板落下。
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2020.4.29 Longwall mining is a mass production technology for underground mining of coal offering a higher percentage of extraction and reduced loss with increased productivity and safety. This is mainly possible because of mechanisation of cutting, loading, and coal evacuation operations and deployment of self-advancing powered roof support
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2017.4.18 As more easily mined deposits are depleted, the reserves are becoming more limited and less favorable. Deposits of coal or trona that are being longwall mined are deep and are getting deeper. Coal bursts and bumps frequently occur within development entries in longwall mining of deep mines due to high stresses. This paper presents a
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2022.6.19 The stability of shale gas wells drilled through current and future coal reserves can be compromised by ground deformations due to nearby longwall mining. Depending on the longwall-induced rockmass permeability, the high-pressure explosive gas from the damaged well may reach mine workings and overwhelm the mine ventilation
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2020.8.10 The roof thickness is 8.5 m, the mining height is 4.5 m, and the distance between the support centerlines is 1.75 m. The rock bulk density is 25 kN/m 3, the elastic modulus of the roof is 40 GPa, the support stiffness is 200 MN/m, and the length of the longwall fully mechanized mining face is 250 m. The roof caving angle is 30°, and the
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2012.11.29 This study presents a numerical investigation on the dynamic mechanical state of a coal pillar and the assessment of the coal bump risk during extraction using the longwall mining method. The present research indicates that there is an intact core, even when the peak pillar strength has been exceeded under uniaxial compression. This
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2019.5.28 need in developing and implementation of new modern mining technologies arose. In roadheading, TBM (tunnel-boring machine) method is gradually introduced. A TBM combines the functions of rock breaking, support installa-tion, mucking and conveying rock. In
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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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2023.4.12 To propose a support stiffness based method for improving the stability of coal wall, static stiffness of the support and fracture development of the coal wall are monitored during retraction period of a panel in the second coal mine of Zhaogu coalfield. It is revealed that the range of support stiffness falls between 50 and 450 MN/m. In face
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2019.7.22 Surface subsidence events induced by underground longwall coal mining operations can cause various disturbances to surface structures ranging from integrity and stability to functionality problems. Highway bridges, as a kind of special road construction that can only tolerate smaller movements and deformations than road pavements, are
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2023.3.29 Underground longwall mining can seriously disturb the surrounding rock masses above the panel. A surface cracking zone, continuous deformation zone, fractured zone, and caved zone can be formed in the overlying strata (termed the “four zones”), which may further result in the spontaneous combustion of coal seams and water inrush. It is
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2022.12.9 In Indonesia, the adoption of the underground coal mining method is discussed to extend coal production. However, the geological conditions in Indonesia are very weak. In particular, the mechanical properties of the immediate roof/floor in shallow depths are weaker than those of coal. Therefore, the control measures to maintain
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2022.2.24 IM can now exclusively reveal that Caterpillar Inc is set to effectively withdraw completely from underground coal and soft rock mining through the divestment of its longwall business to Germany’s Hauhinco Maschinenfabrik GmbH Co KG, based in Sprockhövel, North Rhine-Westphalia. There is a history of cooperation between
узнать больше2022.4.27 A thorough understanding of mining-induced overburden deformation characteristics and the associated stress redistributions are essential to effectively manage complex safety and environmental issues that arise from underground mining. This is particular for mining in deep environments. This paper presents a numerical modelling
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2017.12.4 The surrounding rock coal mining brakes the equilibrium state of in situ stress filed. The surrounding rock experience deformation, destruction, caving and stability under the coupled action of mining stress field and supporting stress field (Gao and He 2010; Ju et al. 2012).Based on the independently researched and developed longwall
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2018.1.19 Most coal mines in China use the longwall mining system. High stresses are frequently encountered around development entries at deep mines. This paper presents an alternate longwall mining layout for thick coal seams to minimize ground control problems. In a conventional longwall panel layout, development entries on both ends of
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2023.11.27 Adriyala Longwall Mine is located in the ALP area of the Singareni Collieries Company Limited, Telangana, India. The mine has three seams such as 1, 2 and 3 having an average thickness of 6.74 m ...
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2020.1.9 High-production methods like longwall mining with hydraulic powered supports are necessary to increase underground coal production in India. Longwall mining had a mixed success record for Indian geo-mining conditions. In this paper, an analysis is presented to optimally design an array of chain pillars in multi-seam longwall mining
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2020.9.23 Salamon M. (1990) Mechanism of caving in longwall coal mining. Proceedings of the 21st U.S. Rock Mechanics Symposium, (pp. 161–168). Denver, CO. Newman D, Agioutantis Z, Karmis M (2001) SDPS for windows: an integrated approach to ground deformation prediction. Proceedings of the 20th International Conference on
узнать больше2021.3.15 Underground coal mining operations produce large numbers of gobs that contain methane from mining coal seams and their adjacent coal seams. In longwall mining, gob methane is released to coal faces, presenting safety issues. Therefore, if gob methane sources can by identified accurately under extraction conditions, then efficient methane
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2022.5.24 Using the theory of overburden pressure and features of force interaction between powered roof support units and roof rocks, the duty of MKYU.2SH-13/27 powered roof support unit in Ruban Mine of ...
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2020.11.19 Shield leg pressure data from all shields and shearer location with time stamp from a mechanized longwall face are monitored and recorded in a surface computer. These data contain random noise due to power failure, leakage of legs, bad sensor reading and other maintenance or geo-mechanical problems. An algorithm is developed to detect
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5 天之前 There are more than 7000 sensors installed in current longwall mining systems. The big data obtained and fast communication technology have been fully utilized to improve and solve operational problems in real time. Those features are fully documented in the new edition. In pursuit of high productivity and cutting cost, life cycle management ...
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2023.1.1 Longwall mining is a fast and mechanized method of coal mining where a large “wall” of coal is mined with a high-powered cutting system and the coal is transported out of the mine through a network of conveyors. The method is a “caving” method and the surface above the “gob” or mined areas typically subside. This method requires a ...
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2023.1.21 The longwall mining process is the most popular high-output underground coal min-ing method. Parallel roadways (known as gate roads) are driven into the coal seam typically several hundred metres apart and several kilometres long. In this full extrac-tion mining process a mining machine called a shearer travels back and forth between the
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2022.6.27 Longwall mining is a common mining method for underground coal seam mining. During longwall seam mining, as the mining length increases, the overburden will be destabilized gradually, sink and subsequently collapse. The key stratum has an important influence on rock strata movement. Key stratum is present in most geological conditions,
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