Strength of shear bands in fluid-saturated rocks

A nonlinear effect of competition between dilation and fluid flow

Evgeny V. Shilko, Andrey V. Dimaki, Sergey G. Psakhie

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This study shows the significant and nonlinear effect of the competition between dilation and fluid flow on the shear strength of constrained shear bands in fluid-saturated rocks. This effect is conditioned by the contribution of the pore pressure to the yield stress and strength. The pore pressure is controlled by the dilation of the pore space in the solid skeleton of the shear band during plastic deformation and by squeezing of pores in surrounding blocks by the dilating shear band due to the high stiffness of the host massif. A generalized equation has been derived to describe the dependence of the shear band strength on the ratio of strain rate to fluid flow rate.

Original languageEnglish
Article number1428
JournalScientific Reports
Volume8
Issue number1
DOIs
Publication statusPublished - 1 Dec 2018

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shear band
dilation
fluid flow
fluid
rock
pore pressure
plastic deformation
pore space
strain rate
skeleton
shear strength
stiffness
effect

ASJC Scopus subject areas

  • General

Cite this

Strength of shear bands in fluid-saturated rocks : A nonlinear effect of competition between dilation and fluid flow. / Shilko, Evgeny V.; Dimaki, Andrey V.; Psakhie, Sergey G.

In: Scientific Reports, Vol. 8, No. 1, 1428, 01.12.2018.

Research output: Contribution to journalArticle

Shilko, Evgeny V. ; Dimaki, Andrey V. ; Psakhie, Sergey G. / Strength of shear bands in fluid-saturated rocks : A nonlinear effect of competition between dilation and fluid flow. In: Scientific Reports. 2018 ; Vol. 8, No. 1.
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