Establishment of SATREPS experimental sites in South African gold mines to monitor phenomena associated with earthquake nucleation and rupture

Durrheim, Raymond; Ogasawara, Hiroshi; Nakatani, Masao; Yabe, Yasuo; Kawakata, Hironori; Naoi, Makoto; Ward, A. K.; Murphy, S.; Wienand, J; Lenegan, Patrick; Milev, A.; Murakami, Osamu; Yoshimitsu, N.; Cichowicz, Artur

doi:10.36487/acg_rep/1201_12_durrheim

Cited by 5 publications

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“…Firstly, we believe that there is scope to improve our knowledge of the dynamic response of the hangingwall and the stope. A project initiated in 2010, 'Observational studies to mitigate seismic risk in mines' (Durrheim et al, 2010;2012), seeks to do just this. While it is likely that dynamic phenomena are highly variable, it may be possible to constrain certain parameters.…”

Section: Resultsmentioning

confidence: 99%

Functional specifications for in-stope support based on seismic and rockburst observations in South African mines

Durrheim¹

2012

Proceedings of the Sixth International Seminar on Deep and High Stress Mining

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Rockbursts pose a significant risk to workers in deep gold and platinum mines in South Africa. In-stope support systems are one of the measures used to mitigate the risk. Over the last two decades several new technologies have been introduced, such as prestressed elongates, roofbolts and nets. However, seismic theory and observations present several characteristics of seismically-induced ground motion that are not taken explicitly into account in the functional specifications for support design, i.e. multi-cyclic shaking, shear motion between hanging-and footwall, transient tensile forces, and structural resonances. Investigations of rockburst damage were reviewed to evaluate the significance of these phenomena. Similar phenomena affect surface structures exposed to earthquake-induced shaking, and earthquake engineers have developed a range of solutions to mitigate damage. These solutions are reviewed to evaluate whether the principles of earthquake-resistant design can be adapted to the underground environment. Finally, functional specifications for rockburst-resistant in-stope support are proposed. Over the last two decades, new types of prestressed yielding props and packs, in-stope roofbolts and nets have been introduced. However, the risk posed by rockbursts has not been eliminated, and efforts to improve the effectiveness of support systems continue. A first attempt to apply the techniques used by earthquake engineers to the design of rockburst-resistant excavations was made by Durrheim et al. (1998a). The work was extended by Hagan et al. (1999), Milev et al. (2002) and Cichowicz et al.

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Section: Resultsmentioning

confidence: 99%