Construction on dolomite in south Africa |
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Authors: | Fritz Von M Wagener Peter W Day |
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Institution: | (1) Jones and Wagener, Inc, Rivonia, South Africa |
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Abstract: | Damage to structures and loss of life have been more severe on dolomite than on any other geological formation in southern
Africa. The subsidence that occurs on dolomitic terrain following development or during dewatering has given dolomite a notorious
reputation and engineers and geologists became reluctant to recommend development on the material.
This has led to the pioneering of founding methods for a wide variety of structures aimed at reducing the risk of severity
of damage due to subsidence settlement Structures successfully founded on dolomitic terrane include residential and industrial
buildings, gold mine reduction works and shaft structures, tailings dams, water retaining structures, and road and rail links.
In this article, various methods of construction, some ot which were developed by the authors, are presented. It commences
with a classification of a dolomite site in terms of overburden thickness followed by a discussion of the relevant construction
methods The methods include mattresses of compacted soil supported by pinnacles or “floating” in residuum, deep foundations
such as caissons, the use of specialized piling techniques, and soil improvement by dynamic consolidation |
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