Results 51 to 60 of about 2,553 (189)
Technique of top coal caving with vibration
, 2009 How to understand the top coal caving process and increase the top coal recovery ratio is one of the urgent problems to be resolved for the longwall top coal caving technology.
Xie, Yao-she, Zhao, Yang-sheng
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Paperless mapping and cave archaeology: A review on the application of DistoX survey method in archaeological cave sites [PDF]
Journal of Archaeological Science: Reports, 2018 Geodetic Stations and Differential Global Positioning Systems are the dominant instruments for mapping in archaeological contexts. However, there are not equal counterparts for cave archaeology survey. There is no way for DGPSs to work inside a cave and use of geodetic station is limited only in relatively dry and wide parts of the caves. This paper is
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, 2019 With mining technology and mechanization degree being improving, fully mechanized caving mining technology (FCM) has become a main method for thick coal seam extraction in China.
Lei Li +6 more
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Open pit or block caving? A numerical ranking method for selection
, 2014 Mining in the 21st century is facing many challenges, among which are low-grade and high tonnage orebodies. One great (r)evolution in mining occurred in the early 20th century when Daniel Jackling proposed the concept of economies of scale for large ...
Suorineni, Asi, Rashidi Nejad, F
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Test of Natural Potential Method in Locating Cave Passageways of Jewel Cave
The UW National Parks Service Research Station Annual Reports, 1990 Ever increasing pressures on our natural environment necessitate measures to detect and ameliorate problems of contamination, construction and overuse, before they become critical. This is particularly the case in our national parks and monuments where the tide of visitors is continually growing.
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Diagram, perspective of undercut block caving method
, 2022 Figure 13 perspective of undercut block caving method.Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.Donor: United States Bureau of Mines.Date scanned: 2002-06 ...
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, 2023 Solid backfilling is an environmentally friendly method of coal mining. Backfilling hydraulic supports are important devices in solid backfill mining.
Peitao Shi +4 more
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Simulation-based multiobjective optimization of tail beam control strategy for top-coal caving
Advances in Mechanical EngineeringIn longwall top-coal caving, the motion control strategy of the hydraulic support tail beam directly affects the caving performance. To reduce gangue admixture and improve the efficiency of top-coal discharge, this study proposes an offline parameter ...
Lei Huang +5 more
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Research on Top Coal Caving Technique in Steep and Extra-Thick Coal Seam
, 2011 Reasonable caving method is an important guarantee of realizing high-yield and high-efficient of the working face. Based on the specific conditions of the 2637 working face in Zhaogezhuang Mine, compared extraction rates under different top coal caving ...
Juguo Zhang +5 more
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Meitan kexue jishuThe coal seam at the 2125 fully mechanized top-coal caving face in Hebi Coal Mine No. 6 exhibits unstable occurrence, with a thickness ranging from 0.4 m to 24 m and a dip angle varying between 8° and 35°.
Dongyin LI +5 more
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