oa Civil Engineer in South Africa - Excavation through saturated decomposed granite by multiple headings with vacuum drainage

Volume 30, Issue 1
  • ISSN : 0009-7845



The initial 150 m of the second bore of the Du Toitskloof Tunnel was driven through soft decomposed granite by a method of multiple headings with vacuum drainage. By comparison, excavation of the soft-ground section of the first bore was done by ground freezing.

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