نتایج جستجو برای: longwall mining

تعداد نتایج: 86882  

Journal: :E3S web of conferences 2021

A powered roof support is an element of a longwall complex. It connected with scraper conveyor by sliding system. The carries shearer mining the coal. second function to protect excavation against uncontrolled impact rock mass. This paper focuses on analysis effectiveness support. main objective determine factors influencing failure-free operation in exploitation process. Moreover, author discu...

2017
R. G. Jeffrey Z. Chen K. W. Mills S. Pegg

Narrabri Coal Operations is longwall mining coal directly below a 15 to 20 m thick conglom‐ erate sequence expected to be capable of producing a windblast upon first caving at longwall startup and producing periodic weighting during regular mining. Site characterisation and field trials were undertaken to evaluate hydraulic fracturing as a method to precondition the conglomerate strata sufficie...

Journal: :Sustainability 2022

Longwall backfill mining effectively mitigates the height of water-conductive fractured zone (HWCFZ), preventing it from reaching overlying aquifer and thus preserving groundwater. However, has disadvantages insufficient filling time space as well mutual constraints between mining. A novel continuous extraction partial (CEPB) water-preserving method was therefore proposed. The analytic hierarch...

Journal: :Energies 2021

The following article analyzes the effectiveness of directional hydraulic fracturing (DHF) as a method rock burst prevention, used in black coal mining with longwall system. In order to define changes seismic activity due DHF at “Rydułtowy” Black Coal Mine (Upper Silesia, Poland), observations were made regarding mass during system using roof layers collapse. was recorded area itself, where, on...

1999
David A. Summers

The use of high pressure waterjets is becoming increasingly common in industrial operations as a means of improving productivity. Although waterjets were initially developed as a mining tool, they have found only a limited use to the present time. Recent developments in the technology, however, promise the creation of relatively small light-weight equipment for use in mines. It is important in ...

Journal: :Mining - Informatics, Automation and Electrical Engineering 2018

Journal: :Journal American Society of Mining and Reclamation 1996

2011
Justin Cable Warren Justin C. Warren

This study involves seismic monitoring of a deep coal mine. The purpose is to examine the processes responsible for induced seismicity. A seismic network consisting of five threecomponent short-period seismometers located above the mine recorded the seismic data. The events discussed here occurred from March 1, 2009 until April 7, 2011 during the mining of three longwall panels and the data was...

Journal: :International Journal of Mining Science and Technology 2021

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