Effect of specimen size on progressive damage and softening in simulated rock

C. S. Desai, T. Kundu, G. Wang

Research output: Contribution to conferencePaperpeer-review


It has been shown previously that the damage accumulation and resulting strain-softening behavior of geologic materials can be modelled by introducing a damage parameter, r, in the hierarchical approach of constitutive modelling. This parameter r, which is a function of deviatoric plastic strain trajectory, varies from zero for no damage condition to unity for maximum damage. Effects of sample size such as diameter and height in laboratory tests on the value of r have not been fully understood. In this paper, the effect of the height of the specimen on the damage parameter is investigated. Attention is restricted to laboratory tests with cylindrical specimens in which the specimen diameter D = 3.0 inch (7.62 cm) is maintained constant, while its height is varied. Since it is difficult to carry out this experimental investigation on real rocks, a rock-like material is simulated from a mixture of plaster of paris, cement, sand and water.

Original languageEnglish (US)
Number of pages3
StatePublished - 1988
EventOffshore and Arctic Operations Synposium 1989 - Houston, TX, USA
Duration: Jan 22 1989Jan 25 1989


OtherOffshore and Arctic Operations Synposium 1989
CityHouston, TX, USA

ASJC Scopus subject areas

  • Geology
  • Geotechnical Engineering and Engineering Geology


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