Onset of pore collapse and dilatancy in porous sandstone under true triaxial compression: Experimental observation and micromechanical modeling

We present new true triaxial compression data obtained in the ductile regime on Bleurswiller sandstone. The deformed samples show a range of failure modes qualitatively similar to what was reported by earlier experimental studies performed in conventional conditions (axisymmetric compression). In pa...

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Vydané v:International journal of rock mechanics and mining sciences (Oxford, England : 1997) Ročník 186; s. 105983
Hlavní autori: Meng, Fanbao, Shi, Lu, Hall, Stephen, Baud, Patrick, Wong, Teng-fong
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier Ltd 01.02.2025
Pergamon and Elsevier
Predmet:
Civil Engineering
Compaction bands
Earth and Related Environmental Sciences
Earth Sciences
Engineering and Technology
Geofysik
Geophysics
Geotechnical Engineering and Engineering Geology
Geoteknik och teknisk geologi
Geovetenskap och relaterad miljövetenskap
Natural Sciences
Naturvetenskap
Samhällsbyggnadsteknik
Sciences of the Universe
Strain energy
Teknik
Wing crack
X-ray computed tomography
Wing crack
Compaction bands
X-ray computed tomography
Strain energy
ISSN:1365-1609, 1873-4545
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Popis
Shrnutí:We present new true triaxial compression data obtained in the ductile regime on Bleurswiller sandstone. The deformed samples show a range of failure modes qualitatively similar to what was reported by earlier experimental studies performed in conventional conditions (axisymmetric compression). In particular, visual inspection and X-ray Computed Tomography imaging reveal compaction localization in all our deformed samples. The pore collapse model of Zhu et al.( 2010) 1 is extended to include the role of the intermediate principal stress and our new data for the onset of shear-enhanced compaction are in basic agreement with this extended model that includes three stress invariants. Published true triaxial data obtained in the brittle regime highlights the impact of the intermediate principal stress on the onset of dilatancy. The predictions of the conventional sliding wing crack model extended to true triaxial conditions are in poor agreement with these data. Another energetic approach pioneered by Wiebols & Cook shows a better agreement with the experimental results. Our new data and analysis will help the interpretation of inelastic deformation under polyaxial compression in various geotechnical and tectonic settings.
ISSN:1365-1609
1873-4545
DOI:10.1016/j.ijrmms.2024.105983