n Journal of the South African Institution of Civil Engineering = Joernaal van die Suid-Afrikaanse Instituut van Siviele Ingenieurswese - Site geology and soils investigation for the Alusaf Hillside Smelter : technical paper

Volume 38, Issue 4
  • ISSN : 1021-2019



The Hillside Smelter Plant is located on the Zululand coastal plain at approximately +33 m MSL and is underlain largely by sands and moderately clayey sands with siltstone bedrock occurring at sea level. The subsurface profile is characterized by the occurrence of denser sand horizons within a generally loose to medium dense, predominantly sand profile. The denser sand horizons are often very variable and, in extreme and localized cases, the denser horizons are wholly absent ('black hole' scenario). Accordingly, while both driven cast-in-place (DCIP) piles and continuous flight auger (CFA) piles could be used generally across the site, DCIP piles could not be used in the localized 'black hole' areas. Underslurry augered piles were used to support the large silos on the site.

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