Distinct element analysis for Class II behavior of rocks under uniaxial compression

Hiroyuki Shimizu, Tomofumi Koyama, Tsuyoshi Ishida, Masakazu Chijimatsu, Tomoo Fujita, Shigeo Nakama

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


In this study, the radial strain control method for uniaxial compression tests was introduced in the distinct element method (DEM) codes and the Class II behavior of rocks was simulated. The microscopic parameters used in the DEM models were determined based on laboratory uniaxial compression tests and Brazilian tests carried at Äspö Hard Rock Laboratory, Sweden. The numerical simulation results show good agreement with the complete stress-strain curves for Class II obtained from the laboratory experiments. These results suggest that the DEM can reproduce the Class II behavior of the rock successfully. The mechanism of the Class II behavior was also discussed in detail from the microscopic point of view. The loading condition and microscopic structure of rocks will play an important role for the Class II behavior.

Original languageEnglish
Pages (from-to)323-333
Number of pages11
JournalInternational Journal of Rock Mechanics and Mining Sciences
Issue number2
Publication statusPublished - 2010 Feb
Externally publishedYes


  • Class II behavior
  • Distinct element method (DEM)
  • Particle mechanics approaches
  • Radial strain control
  • Uniaxial compression test

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology


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