Investigation of peculiarities fracture and dilatancy processes during constrained shear deformation of block-structured geological media

Sergey V. Astafurov, Evgeny V. Shilko, 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 publication19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
PublisherEuropean Conference on Fracture, ECF
Publication statusPublished - 2012
Event19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 - Kazan, Russian Federation
Duration: 26 Aug 201231 Aug 2012

Other

Other19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
CountryRussian Federation
CityKazan
Period26.8.1231.8.12

Fingerprint

Shear deformation
Shear stress
Cellular automata

Keywords

  • Block-structured geological medium
  • Dilatational mechanisms
  • Fracture
  • Shear deformation

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality

Cite this

Astafurov, S. V., Shilko, E. V., & Psakhie, S. G. (2012). Investigation of peculiarities fracture and dilatancy processes during constrained shear deformation of block-structured geological media. In 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 European Conference on Fracture, ECF.

Investigation of peculiarities fracture and dilatancy processes during constrained shear deformation of block-structured geological media. / Astafurov, Sergey V.; Shilko, Evgeny V.; Psakhie, Sergey G.

19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012. European Conference on Fracture, ECF, 2012.

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

Astafurov, SV, Shilko, EV & Psakhie, SG 2012, Investigation of peculiarities fracture and dilatancy processes during constrained shear deformation of block-structured geological media. in 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012. European Conference on Fracture, ECF, 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012, Kazan, Russian Federation, 26.8.12.
Astafurov SV, Shilko EV, Psakhie SG. Investigation of peculiarities fracture and dilatancy processes during constrained shear deformation of block-structured geological media. In 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012. European Conference on Fracture, ECF. 2012
Astafurov, Sergey V. ; Shilko, Evgeny V. ; Psakhie, Sergey G. / Investigation of peculiarities fracture and dilatancy processes during constrained shear deformation of block-structured geological media. 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012. European Conference on Fracture, ECF, 2012.
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