Results 1 to 10 of about 1,490 (177)
International Journal of Mining Science and Technology, 2019 Roof falls in longwall headgate can occur when weak roof and high horizontal stress are present. To prevent roof falls in the headgate under high horizontal stress, it is important to understand the ground response to high horizontal stress in the ...
Mark Van Dyke, Peter Zhang
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Systematic principles of surrounding rock control in longwall mining within thick coal seams
International Journal of Mining Science and Technology, 2019 Effective surrounding rock control is a prerequisite for realizing safe mining in underground coal mines. In the past three decades, longwall top-coal caving mining (LTCC) and single pass large height longwall mining (SPLL) found expanded usage in ...
Jiachen Wang, Zhaohui Wang
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Pillar design and coal burst experience in Utah Book Cliffs longwall operations
International Journal of Mining Science and Technology, 2021 Longwall mining has existed in Utah for more than half a century. Much of this mining occurred at depths of cover that significantly exceed those encountered by most other US longwall operations.
Christopher Mark
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Automation in U.S. longwall coal mining: A state-of-the-art review
International Journal of Mining Science and Technology, 2019 This paper reviews the development of U.S. longwall mining from an unknown to became the world standard in the past five decades with emphasis on automation.
Jingyi Cheng
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Longwall automation: trends, challenges and opportunities
International Journal of Mining Science and Technology, 2017 This paper explores the ongoing development and implementation of longwall automation technology to achieve greater levels of underground coal mining performance.
Chad Hargrave, Jonathon Ralston
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Impact of longwall mining on groundwater above the longwall panel in shallow coal seams
Journal of Rock Mechanics and Geotechnical Engineering, 2015 Since longwall mining causes subsidence through the overlying strata to the ground surface, the surface water and groundwater above the longwall panels may be affected and drained into the lower levels.
Jinwang Zhang
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International Journal of Mining Science and Technology, 2019 Understanding the cantilevers formed by thick, massive beds in the near-seam overburden above longwall panels and the associated loads and strata fracturing effects developed during caving (main and periodic weightings) are key elements for the ...
Durga Charan Panigrahi
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Influence of canopy ratio of powered roof support on longwall working stability – A case study
International Journal of Mining Science and Technology, 2019 The case study describes longwall coal seam A in a hard coal mine, where longwall coal face stability loss and periodic roof fall occurrences had been registered.
Tomasz Janoszek, Sylwester Rajwa
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Gas control in TG motor region in longwall gassy mines [PDF]
Podzemni Radovi, 2020 A number of longwall mines suffer significant gas delays due to high methane gas concentration levels (i.e. above 1.0% statutory limit for methane gas level) near the tailgate (TG) motor area of the longwall face. Therefore, in addition to development of
Tanguturi Krishna +2 more
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Experimental study of transient thermal conditions in longwall faces
Горные науки и технологии, 2022 With limited mineral resources, existing mines are seeking to extract increasingly hard-to-reach and deep-seated mineral reserves. Increasing mining depth leads to problems connected with the provision of comfortable and safe working conditions. The main
Maxim O. Perestoronin +3 more
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