Investigation of dilatancy in block-structured geological medium on the base of movable cellular automaton method

Sergey V. Astafurov, Evgeny V. Shilko, Alexaner V. Andreev, Sergey G. Psakhie

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The peculiarities of dilatancy processes in block-structured media that experience nonequiaxial compression under shear deformation are investigated using movable cellular automaton (MCA) method. For a characteristic of compression nonequiaxiality (also termed the degree of constraint) a dimensionless parameter - the lateral to normal pressure ratio in the deformation plane - used. The main objective of the work is to trace the sequence in which various dilatancy mechanisms are involved in deformation depending on the level of shear stress and degree of constraint. It is shown that in the block-structured medium an increase in the degree of constraint causes the dominating dilatation mechanism to change from slip of discontinuity surfaces to opening and expansion of pores. The dominating dilatancy mechanism changing because increasing the degree of constraint increases the threshold shear stress at which the slip is activated. Beginning with certain lateral pressures, the slip is impeded giving way to expansion of the pore space; however, the latter fails to provide so considerable volume change as the slip of contact surfaces does, and this decrease critical dilatation characteristics of the medium and, in particular, its dilatation coefficient and volume changing.

Original languageEnglish
Title of host publicationParticle-Based Methods II - Fundamentals and Applications
Pages584-595
Number of pages12
Publication statusPublished - 2011
Event2nd International Conference on Particle-Based Methods, PARTICLES 2011 - Barcelona, Spain
Duration: 26 Oct 201128 Oct 2011

Other

Other2nd International Conference on Particle-Based Methods, PARTICLES 2011
CountrySpain
CityBarcelona
Period26.10.1128.10.11

Keywords

  • Block-structured medium
  • Dilatancy
  • Dilatancy mechanisms
  • Movable cellular automaton method
  • Nonequiaxial compression
  • Shear deformation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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  • Cite this

    Astafurov, S. V., Shilko, E. V., Andreev, A. V., & Psakhie, S. G. (2011). Investigation of dilatancy in block-structured geological medium on the base of movable cellular automaton method. In Particle-Based Methods II - Fundamentals and Applications (pp. 584-595)