Browsing Mining Engineering by Author "Maritz, Jan Abram"

Browsing Mining Engineering by Author "Maritz, Jan Abram"

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  • The effect of shear stresses on pillar strength 
    Maritz, Jan Abram (University of Pretoria, 2015)
    In mining, the loading environment on pillars is highly complex with combinations of normal and shear stresses. It is also understood that with an active and working face, constant redistribution of stresses will occur to ...
  • The presence of shear stresses in pillars and the effect on factor of safety in a room-and-pillar layout 
    Maritz, Jan Abram (Southern African Institute of Mining and Metallurgy, 2014-12)
    Since the dawn of mining, pillars have been used as primary support to ensure stable workings. Early designs were based on trial and error, after which more scientific means developed over time. A vast amount of progress ...
  • Status of the phasing out of the Chamber of Mines of South Africa Certificates of Competency 
    Grobler, Hennie; Maritz, Jan Abram (Southern African Institute of Mining and Metallurgy, 2017-08)
    The Chamber of Mines of South Africa (CoMSA) Certificates of Competency (CoCs) were introduced to standardize stand-alone in-house qualifications for persons working in the South African Mining and Minerals Industries ...
  • A study of the effect of pillar shape on pillar strength 
    Maritz, Jan Abram; Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2023-05)
    Pillar strength is affected by pillar shape, but this has largely been ignored in past research studies. Bord-and-pillar layouts are typically designed using empirical strength equations developed for square pillars. ...