Critique of the South African squat coal pillar strength formula
نویسندگان
چکیده
منابع مشابه
Strength Reduction of Coal Pillar after CO2 Sequestration in Abandoned Coal Mines
CO2 geosequestration is currently considered to be the most effective and economical method to dispose of artificial greenhouse gases. There are a large number of coal mines that will be scrapped, and some of them are located in deep formations in China. CO2 storage in abandoned coal mines will be a potential option for greenhouse gas disposal. However, CO2 trapping in deep coal pillars would i...
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OBJECTIVES This study, the first to document the prevalence of pneumoconiosis among a living South African coal mining cohort, describes dose-response relationships between coal workers' pneumoconiosis and respirable dust exposure, and relationships between pneumoconiosis and both lung function deterioration and respiratory symptoms. METHODS A total of 684 current miners and 188 ex-miners fro...
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This paper gives an overview of the difficulties associated with the design of hard rock pillars in South African mines. Recent examples of large scale pillar collapses in South Africa suggest that these were caused by weak partings which traversed the pillars. Currently two different methods are used to determine the strength of pillars, namely, empirical equations derived from back analyses o...
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McBride, JM, Blow, D, Kirby, TJ, Haines, TL, Dayne AM, and Triplett, NT. Relationship between maximal squat strength and five, ten, and forty yard sprint times. J Strength Cond Res 23(6): 1633–1636, 2009—The purpose of this investigation was to examine the relationship between maximal squat strength and sprinting times. Seventeen Division I-AA male football athletes (height = 1.78 6 0.04 m, bod...
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ژورنال
عنوان ژورنال: Journal of the Southern African Institute of Mining and Metallurgy
سال: 2016
ISSN: 2411-9717
DOI: 10.17159/2411-9717/2016/v116n3a11