نتایج جستجو برای: longwall mining
تعداد نتایج: 86882 فیلتر نتایج به سال:
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...
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...
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...
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...
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 ...
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...
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