Crack coalescence and strain accommodation in gypsum rock

Chiara Caselle; Sabrina Maria Rita Bonetto; Daniele Costanzo

doi:10.3221/IGF-ESIS.52.19

Crack coalescence and strain accommodation in gypsum rock

Authors

Chiara Caselle University of Torino, Department of Earth Science, Italy https://orcid.org/0000-0002-3081-1555
Sabrina Maria Rita Bonetto University of Torino, Department of Earth Science, Italy https://orcid.org/0000-0002-6579-1419
Daniele Costanzo Polytechnic of Torino, Department of Structural, Geotechnical and Building Engineering, Italy https://orcid.org/0000-0002-1957-275X

DOI:

https://doi.org/10.3221/IGF-ESIS.52.19

Keywords:

Gypsum, DIC analysis, Microstructure, Brittle-ductile transition

Abstract

Gypsum is a soft rock with low strength and high propensity to plastic deformation. Its mechanical properties are relevant in a wide range of technical application (e.g. tunnel excavation, stability assessment of underground quarries, oil and gas accumulation). The micro-mechanisms involved in the deformation of gypsum rock have for long time interested the scientific world and are still not completely understood. The peculiar crystallographic structure of this bi-hydrate salt, with water molecules layered in the salt structure, favours the development of plastic structures in the rock.

The present work proposes an experimental investigation of strain accommodation mechanisms in gypsum rock, reporting data referred to uniaxial and triaxial stress conditions. The rock strain was studied with a multiscale approach, with the comparison of results from DIC and microstructural analyses.

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Published

04-03-2020

Issue

Vol. 14 No. 52 (2020): April 2020

Section

Fracture

License

Copyright
Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.

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How to Cite

Crack coalescence and strain accommodation in gypsum rock . (2020). Frattura Ed Integrità Strutturale, 14(52), 247-255. https://doi.org/10.3221/IGF-ESIS.52.19