Compaction bands in a porous sandstone sample with pre-induced shear bands

Elli Maria Charalampidou, Sergei Stanchits, Georg Dresen

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

Understanding how different modes of deformation bands may interact at the same rock mass is of crucial importance, since such interaction may affect the flow properties within the reservoir rock. In this work we focus on the compaction band nucleation and evolution within a porous sandstone, in which a shear-band has been previously developed. For such a purpose, we performed at the laboratory scale triaxial compression experiments under 20 and 185 MPa confining pressures on a single Bentheim sandstone specimen. Acoustic Emissions (AE) were recorded throughout all experimental stages. AE hypocentre locations and AE source mechanisms were used to describe the spatiotemporal evolution of the developed deformation bands. The shear band evolution was AE controlled. Shear type sources were the prevailing mechanisms up to the peak stress, whereas, the shear band growth was mainly dominated by compressive type sources. The compaction band nucleated at the tip of the pre-existing shear band and evolved towards the circumference of the specimen. A second compaction band nucleated with increasing axial strain at the top part of the specimen and not far from the already developed shear and compaction bands. The dominant mechanisms during the compaction band initiation and formation were compressive type sources.

Original languageEnglish
Pages (from-to)391-398
Number of pages8
JournalSpringer Series in Geomechanics and Geoengineering
Issue number191289
DOIs
Publication statusPublished - 2017
Externally publishedYes
Event11th International Workshop on Bifurcation and Degradation in Geomaterials, IWBDG 2017 - Limassol, Cyprus
Duration: 21 May 201725 May 2017

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