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 language | English |
|---|---|
| Title of host publication | 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 |
| Publisher | European Conference on Fracture, ECF |
| Publication status | Published - 2012 |
| Event | 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 - Kazan, Russian Federation Duration: 26 Aug 2012 → 31 Aug 2012 |
Other
| Other | 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 |
|---|---|
| Country | Russian Federation |
| City | Kazan |
| Period | 26.8.12 → 31.8.12 |
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Keywords
- Block-structured geological medium
- Dilatational mechanisms
- Fracture
- Shear deformation
ASJC Scopus subject areas
- Safety, Risk, Reliability and Quality
Cite this
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 proceeding › Conference contribution
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TY - GEN
T1 - Investigation of peculiarities fracture and dilatancy processes during constrained shear deformation of block-structured geological media
AU - Astafurov, Sergey V.
AU - Shilko, Evgeny V.
AU - Psakhie, Sergey G.
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
KW - Block-structured geological medium
KW - Dilatational mechanisms
KW - Fracture
KW - Shear deformation
UR - http://www.scopus.com/inward/record.url?scp=84905484440&partnerID=8YFLogxK
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M3 - Conference contribution
BT - 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
PB - European Conference on Fracture, ECF
ER -