Abstract
This paper discusses the results of extensive in-situ rock deformability tests conducted on three major engineering projects in South Africa: the Orange River Water Project, the Drakensberg Pumped Storage Scheme and the Elandsberg Pumped Storage Scheme. These projects features testing programmes involving many different methods, thus enabling comparisons and assessments of the reliability of the various in-situ tests. A review is also presented of the in-situ deformability data from those important projects througout the world which are well documented. It is shown that in-situ tests pose a number of uncertainties even for rock mechanics specialists and a new approach to assessing rock mass deformability based on the Geomechanics Classification of rock masses is suggested.
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