DOI: 10.1007/s10706-015-9850-3 Corpus ID: 109330743; An Integrated Approach for the Prediction of Underground-Induced Strata Movement over Longwall Coal Mining Panels @article{Hao2015AnIA, title={An Integrated Approach for the Prediction of Underground-Induced Strata Movement over Longwall Coal Mining Panels}, author={Xianjie Hao …
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Longwall panels range in size (in plan view), from 500 ft wide by 2000 ft long to over 1200 ft wide by 20,000 ft long. Size is determined by the reserve and the availability of capital to …
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For this, a deep longwall panel surrounded with the side goaved-out panels is analysed by developing eighteen (18) 3D numerical models for various geo-mining conditions. Three critical scenarios are developed considering five retreat distances for each scenario, and each scenario is situated at different depths.
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3. EFFECT OF LONGWALL MINING ON PERMEABILITY Longwall mining induces both stress increases and stress reductions in the surrounding rock. Around the edges of the panel, the stresses will increase, while the rock directly above and below the extracted panel will experience significant stress relief. In addition, the increased stresses can cause
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Longer panels allow longwall operators to mine more coal between moves, which places a greater demand for extended shearer performance. The average panel …
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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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Historically there have been a number of different hypotheses and empirical models developed in an attempt to describe the nature of fracturing above longwall panels in underground coal mining. The motivation for such models varies, ranging from understanding the impact of mining on surface subsidence, to back-analysis of caving …
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What Is Longwall Coal Mining? Longwall mining is a form of coal mining underground. In the longwall method, a long wall of coal is found and mined in a single slice between 50 cm and 6 m thick. …
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Most longwall operators want to go the extra mile to make sure that machine will operate reliably throughout the next panel." Longwall panels have grown consistently in length and width over the last 10 years. Longer panels allow longwall operators to mine more coal between moves, which places a greater demand for …
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A large block of coal is removed in longwall mining, disturbing the whole overburden and forming a surface subsidence basin (Lawson et al. 2017; Peng 2008).Unlike other issues, such as the water inrush, roof caving, and coal–gas outburst, surface subsidence is a public relations issue involving the general public since it causes …
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9.4.2c Longwall Mining. Longwall mining applies to thin, bedded deposits, with uniform thickness and large horizontal extension. Typical deposits are coal seams, potash layers …
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This article delves into the intricacies of longwall mining, exploring its methodology, advantages, and its application within some of the largest coal mines in the United States. What is Longwall Mining? Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice, typically 0.6–1.0 meters thick.
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Longwall mining is a method of extracting a coal seam in slices which are called longwall panels. The longwall panels usually need to be prepared by a series of gateroads. Chain pillar plays a key role in supporting the gateroads and therefore must be capable of bearing the overburden weight and extraction-caused abutment pressure.
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The change in hydraulic conductivity (K) above subsided longwall panels at underground coal mines is determined using a data base of pre-mining and post-mining K measurements made at multiple ...
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DOI: 10.1016/J.IJRMMS.2013.02.009 Corpus ID: 128474353; Vertical stress changes in multi-seam mining under supercritical longwall panels @article{Suchowerska2013VerticalSC, title={Vertical stress changes in multi-seam mining under supercritical longwall panels}, author={Anastasia Suchowerska and Richard S. …
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Learn about longwall mining, a continuous mining system that extracts coal from a rectangular block of coal. Find chapters and articles on longwall mining techniques, …
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The mining technology is fully mechanized coal mining, and all panels in this mine use the retreating longwall method to extract the coal seam. The mining coal seam has an average thickness of 8 m. The fault structure in the minefield is developed and thus has a significant influence on the roadway layout and safe production.
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Klemetti et al. studied the extent and magnitude of the abutment loading experienced due to the extraction of the longwall panels in a coal mine. The result of the numerical analysis showed that the increase in load during longwall panel extraction was negligible . Yang et al. studied pillar design by combining numerical simulation and field ...
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Examining the optimum panel pillar dimension in longwall mining considering stress distribution. Mustafa Emre Yetkin *, Muharrem Kemal Ozfirat & Turgay Onargan. …
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The aim of this study is to identify the variables that affect stress redistribution in the strata underneath supercritical longwall panels. To do this, Wilson's equations for the vertical stress distribution in the vicinity of a single longwall panel after it has been mined have been used in conjunction with finite element modelling to evaluate vertical …
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The panel and face length of about 2300 m and 250 m respectively, by addressing all the strata problems encountered in the earlier longwall panels. ALP is a successful longwall mine working at more than 362 m of depth from the surface. Some of the works implemented in association with CSIR-CIMFR are shown in Fig. 4.
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The longwall mining operations in two panels (A and B) have been conducted under a section of I-79 during the time period from 2004 to 2006 as shown in Fig. 5. The width of each of the two longwall panels was about 1266 ft (386 m) while the chain pillar system between these two panels was about 184 ft (56 m) wide. The average …
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The company has made some major capital investments recently to widen the longwall faces, develop the BMX mine, build the Training Academy, and install the overland and slope conveyors. All of this is an effort to safely mine more than 820 million clean tons between now and 2045, explained Brock. ... The typical longwall panels at …
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A detailed study of the mechanical behaviour of the strata around the longwall coal mining panels was made. After identifying the type of coal measure rock formations, their splitting capabilities, formation of parting planes in the strata, caving characteristics, strata mechanics, etc. are identified and correlated with the physico …
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The high productivity being achieved by longwall mining demonstrates its potential for being a substantial segment of underground coal production. Longwall mines produce more than 30 pct of all underground coal, up from 5 pct just 15 years ago. ... As longwall panels become longer, panels and gate roads will be influenced by barriers, …
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In coal mining, longwall mining is a preferred method to maximize production by extracting large blocks of coal that have been outlined with a set of development entries. In U.S. mines, longwall panels are typically 305 m (1,000ft) wide (with a continual trend towards even wider panels), and usually over
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One longwall face in West ia was removed, Arch Coal's Mountain Laurel mine, which completed longwall mining operations last fall. The top three longwall operations produced more than 10 million tons per year (tpy) from two longwall faces. Last year, 13 longwall installations produced at a capacity of 5 million tpy or more, compared …
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Mining-induced subsidence is critical for ecological environment reconstruction and damage prevention in coal mining areas. Understanding the characteristics of surface subsidence with multi-seam mining is the first step. Surface subsidence of different mining panel layout configurations was investigated by means of …
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