Results 31 to 40 of about 7,043 (214)
Overall requirements for an advanced underground coal extraction system [PDF]
, 1980 Underground mining systems suitable for coal seams expoitable in the year 2000 are examined with particular relevance to the resources of Central Appalachia. Requirements for such systems may be summarized as follows: (1) production cost; (2)miner safety;
Goldsmith, M., Lavin, M. L.
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Evaluation of coal longwall caving characteristics using an innovative UDEC Trigon approach [PDF]
, 2016 Author version of article. The version of record is available from the publisher via DOI: 1016/j.compgeo.2013.09.020Copyright © 2013 Elsevier Ltd. All rights reserved.The paper presents an innovative numerical approach to simulate progressive caving of ...
Coggan, John, Gao, Fuqiang, Stead, Doug
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Advances in Civil Engineering, 2021 Adopting an effective top coal caving method is the key to enhancing coal recovery and reducing gangue content for the fully mechanized top coal caving working face with extra-thick coal seams.
Shi Jiulin +3 more
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Research on automatic coal caving control system
Gong-kuang zidonghua, 2018 Aiming at problem that fully mechanized caving face at the back end of fully mechanized top coal caving face adopted manual caving control method, its automation level differed greatly from that at the front end of fully mechanized top coal caving face ...
CUI Zhifang, NIU Jianfeng
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Fossil trees, tree moulds and tree casts in the Palaeocene Mull Lava Field, NW Scotland: context, formation and implications for lava emplacement [PDF]
, 2016 Megafossils and macrofossils of terrestrial plants (trees, leaves, fruiting bodies, etc.) are found in sedimentary and pyroclastic units interbedded with lavas in many ancient lava fields worldwide, attesting to subaerial environments of eruption and the
Bell, Brian R., Williamson, Ian T.
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Determination on Reasonable Mining Height and Top Coal Caving Technology in Huating Coal Mine
Meikuang Anquan, 2020 In view of the problems, such as coal wall spalling, roof caving and low recovery rate of top coal in 250107-1 fully mechanized caving face of Huating Coal Mine at present, the method of combining FLAC3D numerical analysis and theoretical calculation ...
QIAO Zhongdong, QU Ying, YANG Guohong, LIU Biao
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Influence of man-made edaphotopes of the spoil heap on biota [PDF]
, 2018 The aim of the work is to investigate the influence of man- made edaphotopes of colliery spoil heap on biota by bioindication method. The physicochemical properties of edaphotopes were investigated: humidity, substrate temperature,
Kuzmenko, Oleksandr +11 more
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Geofluids, 2020 This paper is aimed at solving the technical problems such as low recovery ratio and frequent disasters in steeply inclined and extrathick coal seams at residual high sectional coal pillar.
Wenhua Yang +4 more
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Formation of safety conditions for development of deposits by open mining [PDF]
, 2018 The researched parameters of the catching device, which ensures the safe operation of equipment and working people in deep open pits, where are formed the benches by steep dipping layers. For obtaining the results, the following methods were
Anisimov, Oleh +12 more
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Research on automatic memory coal caving control
Gong-kuang zidonghua, 2019 For low coal caving efficiency, poor coal caving quality and other problems existing in manual coal caving control mode of fully-mechanized top coal caving working face, an automatic memory coal caving control method was proposed by referring to memory ...
CUI Zhifang, NIU Jianfeng
doaj +1 more source