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<p>One of the most challenging safety problems in room and pillar coal mines is roof fall phenomena during retreat mining. Roof fall not only causes fatal and non-fatal injuries on miners, stoppages in mining operations and equipment breakdowns, but ...
Reference: International Journal of Engineering Research & Technology (IJERT), Vol. 2 Issue 9, September - 2013.
<p style="text-align: justify;">The LKAB Malmberget Mine is mined using sublevel caving. This mining method is cost-effective but results in successive caving of the host rock and mining-induced ground deformations. Consequently, re-locations of residential ...
Reference: Journal of Earth Sciences and Geotechnical Engineering, vol. 3, no. 4, 2013, 147-173 ISSN: 1792-9040 (print), 1792-9660 (online) Scienpress Ltd, 2013
The geometry and morphology of a set of low-angle fractures around a stope in a deep Witwatersrand gold mine are explained in terms of extension fractures forming under variable conditions of stress. Primary extension fractures (E1) form some distance ahead ...
Reference: The Journal of The Southern African Institute of Mining and Metallurgy, VOLUME 112, AUGUST 2012
Classifying the rock mass is widely seen as being the fieldwork required to characterize the rock mass and enable the application of empirical design methods associated with the different classification systems. This paper argues that it is fundamentally important ...
Reference: The Journal of The Southern African Institute of Mining and Metallurgy, VOLUME 112, AUGUST 2012
<p>The bilinear brittle failure criterion that utilizes the unconfined compressive strength (UCS) and a spalling limit of 3.4, together with a tensile strength cut-off can be used to model the height of failure above coal mine roadways. Transverse isotropy ...
Reference: R. Seedsman, Application of the Brittle Failure Criterion to the Design of Roof Support in the Soft Rocks of Coal Mines, 11th Underground Coal Operators' Conference, University of Wollongong & the Australasian Institute of Mining and Metallurgy, 2011, 60-72.
The study site was a longwall tailgate subjected to a severe horizontal stress concentration. Field measurements indicated that the stresses applied to the study site nearly doubled during longwall mining, resulting in roof deformations extending to a height ...
Reference: Int J Rock Mech Min Sci 2007 Feb 44(2)
Although some mines use monitoring techniques to gain additional information on roof stability, this practice is usually short-term and localized to address ground conditions in a particular section or part of the mine. A methodology to assess the risk for ...
Reference: 2006 SME Annual Meeting and Exhibit, March 27-29, St. Louis, Missouri
<p>Data necessary for rock mass classification have been collected in part of the Fimiston Open Pit in Kalgoorlie using both scanline mapping and diamond drill logging. These data have been used to compare and contrast the three main rock mass classification ...
Reference: Australian Geomechanics December 2001
Observations of pillar failures in Canadian hard-rock mines indicate that the dominant mode of failure is progressive slabbing and spalling. Empirical formulas developed for the stability of hard-rock pillars suggest that the pillar strength is directly related ...
Reference: International Journal of Rock Mechanics & Mining Sciences 37 (2000)
Since it was first introduced, the Coal Mine Roof Rating (CMRR) has been widely accepted as a tool for geologic characterization and mine planning. This paper discusses the application of the CMRR to another practical ground control problem. Extended cuts ...
Reference: Min Eng 1999 51(4)