oa Civil Engineering = Siviele Ingenieurswese - The upgrading of Black residential areas : Kwazakhele Township
During the construction of a section of National Route N13 (Johannesburg Southern Bypass) two large cuttings ware excavated. The first, in andesite lava, was adjacent to a Rand Water Board pipeline and the second, In quartzites, adjoined private dwellings. The cuttings were restrained with stressed anchors and unstressed dowels and the exposed faces were protected by concrete panels. The geotechnical design of the lateral support In the andesite was problematic, owing to the unpredictable variations In rock weathering. By contrast, the quartzite cutting was uniformly weathered, with consistent patterns of jointing, and design problems were concerned mainly with the overlying transported soil.
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