长壁采矿 Longwall Mining: 最新的百科全书、新闻、评论和研究
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 公里（1.9-2.5 英里）（尽管它们可以长达 7.5 公里（4.7 英里）），为 250 到 400 米（820 到
Read More
Longwall Mining SpringerLink
2016.2.3 Longwall mining of coal originated in the 1800s as a so-called ‘hand-got’ mining method (pick and shovel) using timber props with headboards as face support.
Read More
Longwall Mining, 3rd Edition Syd Peng Taylor
2019.11.18 Longwall Mining, 3 rd edition will be of interest to professionals and academics in the field of mining engineering
Read More
HISTORY AND METHODS – Mining Science and
The mechanised method of longwall mining was first introduced to Australia in 1963 and currently (2005)there are 27 longwall faces operating in Australia. Production from Australia’s longwall faces represented 18% of
Read More
Longwall Mining - an overview ScienceDirect Topics
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
Read More
Concurrent mining and reclamation for underground coal mining ...
2018.3.27 Abstract. Large scale underground mining of coal resources in China using longwall mining has resulted in ecological and environment problems, including surface
Read More
Automation in U.S. longwall coal mining: A state-of-the-art
2019.3.1 Since longwall mining consists of three major machines, shearer, AFC, and shields, there are two types of “automation”, “automation” for each machine and
Read More
Minerals Free Full-Text An Innovative Longwall
The novel approach “Longwall Mining with Split-level Gateways (LMSG)”, which is an innovative patent invented by Dr. Zhao, J.L in 1998 at China University of Mining and Technology (Beijing) [7,8], is being employed for
Read More
Various phases in surface movements linked to deep coal longwall mining ...
2020.5.9 The mining method was longwall mining without backfill. Over the entire lifetime of the mines, various levels of mechanization were applied. In the first decades,
Read More
Longwalls Lead the Way Underground - Coal Age
2020.2.10 One longwall face in West Virginia was removed, Arch Coal’s Mountain Laurel mine, which completed longwall mining operations last fall. The top three longwall
Read More
Formation of fractured zones in overburden due to longwall mining ...
2003.2.6 The fractured zones caused by mining were studied in the overburden of the Torezko-Snezhnyanskaya area, Ukraine, through the change in natural gas emission from these zones during longwall coal excavation. Zones of interconnected fractures and separate horizontal fractures were studied with vertical wells drilled from the ground
Read More
Geological and geotechnical aspects of
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
Read More
长壁采矿 Longwall Mining: 最新的百科全书、新闻、评论和研究
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。
Read More
Design of an Optimum Longwall Face for Improved Ground
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
Read More
Concurrent mining and reclamation for underground coal mining ...
2018.3.27 Large scale underground mining of coal resources in China using longwall mining has resulted in ecological and environment problems, including surface subsidence that is considered serious due to competing interests of prime agricultural lands, food security, and regional economic development. The subsided lands must be rehabilitated
Read More
Longwall method coal mining Britannica
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, and at the end of the. The other principal method of modern mining, longwall mining, had been introduced as early as the ...
Read More
Numerical Simulation on Pillar Design for Longwall Mining
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
Read More
Rockmass Permeability Induced by Longwall Mining Under
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
Read More
Minerals Free Full-Text Characterization of Overburden
2022.4.27 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
Read More
Verification of 3D Numerical Modeling Approach for Longwall
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
Read More
Mechanical analysis of the structure of longwall mining hydraulic ...
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
Read More
Optimum Chain Pillar Design at the Deepest Multi-Seam Longwall
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
Read More
Numerical Investigation of the Dynamic Mechanical State of
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
Read More
Numerical modelling approach for estimation of a yield zone
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 ...
Read More
Techniques for Assessing and Mitigating Longwall Subsidence
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
Read More
长壁开采（地下开采方法）_百度百科
长开采一种普遍采用的 地下开采 方法,系按前进或后退方式进行开采,整个煤层都可采出,后面不留 矿柱 或 支护 。. 长壁开采在欧洲已普遍采用,在美国也有所推广。. 长壁开采与其它方法如房柱式开采法相比,优点是通风良好和生产率高。. 中文名. 长壁开采. 外文 ...
Read More
Longwall Mining, 3rd Edition - 1st Edition - Syd Peng
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 ...
Read More
Advances in coal mining technology and sustainable mining
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 ...
Read More
Stability Control of the Equipment Recovery Passage in a
2020.8.25 Equipment recovery passage (ERP) is being widely employed in longwall panel for the purpose of recovering heave mining equipment at the end of mining stage. The stability of the ERP, however, is always difficult to control although powerful supporting structures are employed, which restricts its further promotion. In the present paper, we
Read More
Surrounding rock control theory and longwall mining technology ...
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
Read More
A New Method for Determining Gob Methane Sources
2021.3.15 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
Read More
Improving stress environment in development entries through
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
Read More
Study of water-conducting fractured zone development law
2022.5.14 Taking the 12,401 longwall face of Shangwan coal mine as the engineering background, the average buried depth is 220 m, the mining height is 8.8 m, the length of longwall face is 300 m, and the ...
Read More
Caterpillar to exit underground longwall mining business
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
Read More
Discontinuous Modeling of Roof Strata Caving in a Mechanized Longwall ...
2022.3.2 Abstract A better understanding of the interaction between shield supports, roof, and coal strata, along with the prediction of roof deformation and caving behavior is essential for successful longwall mining operations. The stability of a longwall face ...
Read More
Longwall mining method with roof-cutting unloading and
2018.11.16 In longwall mining, two gate roads must be excavated during the mining of each longwall face and a coal pillar must be retained to bear the ground pressure of the roof (Qian 2000; Alehossein and Poulsen 2010; Zhang and Tu 2016). Since the beginning of the twenty-first century, the immense energy consumption and the high-intensity coal
Read More
An Algorithm for Evaluation of Mining Cycle Parameters and
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
Read More
Longwall Mining - an overview ScienceDirect Topics
Coal-Mining Techniques and Coal Fires. Stanley R. Michalski, in Coal and Peat Fires: A Global Perspective, 2011 Longwall Coal Mining. The longwall-mining method is a continuous mining system that was developed for mining coal deposits uniform in thickness and slope or where the overburden pressures may crush support pillars or for improving productivity. .
Read More
Comparative analysis of the mine pressure at non-pillar longwall mining ...
2019.5.21 Abstract. Non-pillar coal mining has been developed and implemented in the recent decades in China's coal mining industry. The non-pillar longwall mining by roof cutting without pre-excavated entry (N00 mining method) is one of the latest non-pillar mining methods and this method has the advantages of reduced roadway drivage ratio
Read More
