Abstract
Discontinuities are of major importance considering the stability of rock masses. Different experimental and numerical methods can be used for their study. As the « blue book » of the International Society of Rock Mechanics (ISRM, 2007) is republished, it is particularly relevant to wonder about the best procedures to characterize the behaviour of the discontinuities of the rock mass. This paper presents the LRPC Toulouse's experimental devices and describes the current testing procedures. It also points out the difficulties encountered in the aim of modelling and design. The approach involves testing on natural discontinuities and their representation using the constitutive laws proposed in the UDEC software.
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