Rock Mechanics and Rock Engineering

, Volume 33, Issue 4, pp 243–266

Mechanical Tests on Pervasively Jointed Rock Material: Insight into Rock Mass Behaviour

  • R. Ribacchi

DOI: 10.1007/s006030070002

Cite this article as:
Ribacchi, R. Rock Mech Rock Engng (2000) 33: 243. doi:10.1007/s006030070002


In the exploration phase for the design of an underground cavern in a limestone formation a large number of triaxial compression tests were carried out on laboratory specimens which were characterized by a variable degree of fracturing. The data were analyzed to investigate the influence of fracture intensity and of confining stress on the mechanical parameters. In particular, investigations focused on the relationships between the parameters of the strength criteria, respectively in residual and peak conditions, on the decay of the Young modulus with stress level in the prepeak phase of the test, and on the brittleness of the rock in the postpeak phase. The tested rock can be considered as a small-scale model of a jointed rock mass, and the laboratory data therefore provide useful insight into the mechanical behaviour of rock masses, especially the relationships between residual and peak strength parameters, which are required in many analytical models and in numerical codes for the analysis of underground excavations.

Copyright information

© Springer-Verlag/Wien 2000

Authors and Affiliations

  • R. Ribacchi
    • 1
  1. 1.Department of Structural and Geotechnical Engineering, University of Roma La Sapienza, Rome, ItalyIT

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