Cristin-resultat-ID: 1773258
Sist endret: 20. februar 2020, 11:34
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
2019

Benchmark Study of Undrained Triaxial Testing of Opalinus Clay: Results and Implications for Robust Testing

Bidragsytere:
  • S.B. Giger
  • A. Minardi
  • A Ferrari
  • Lyesse Laloui
  • R.T. Ewy
  • R. Stankovic
  • mfl.

Bok

6th EAGE Shale Workshop 2019, Bordequx, France 28 April - 1 May 2019
ISBN:
  • 978-1-5108-8666-7

Utgiver

European Association of Geoscientists and Engineers (EAGE)
NVI-nivå 0

Om resultatet

Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Publiseringsår: 2019
Antall sider: 4
ISBN:
  • 978-1-5108-8666-7

Klassifisering

Fagfelt (NPI)

Fagfelt: Geofag
- Fagområde: Realfag og teknologi

Beskrivelse Beskrivelse

Tittel

Benchmark Study of Undrained Triaxial Testing of Opalinus Clay: Results and Implications for Robust Testing

Sammendrag

We have performed a comparative study of undrained triaxial testing with five different laboratories, to explore the reproducibility of test results. Opalinus Clay was sourced as testing material from a borehole at the Mont Terri URL. Cores were vacuum-sealed, and resin impregnated immediately after recovery. Systematic determination of basic properties such as water content, grain density and bulk mineralogy of specimens after testing assisted in diagnostic test evaluation. A detailed testing protocol was requested to avoid specimen damage during initial loading («swelling») and to verify specimen saturation. A balanced pore fluid was used for testing, and a consolidation phase was performed to reach specific target effective stress levels prior to the shear phase. One laboratory deviated from these protocols, as it did not use an external pore fluid. Instead, specimens were brought to variable saturation levels in a desiccator prior to assembling them into the rig. For specimens with almost identical basic properties, the test results were indeed found to be in very good agreement, despite the different procedures applied. Differences in test results can be attributed to material heterogeneity. The study provides compelling evidence that robust triaxial testing can be achieved with shales.

Bidragsytere

S.B. Giger

  • Tilknyttet:
    Forfatter
    ved Sveits

A. Minardi

  • Tilknyttet:
    Forfatter
    ved Ecole Polytechnique Fédérale de Lausanne

A Ferrari

  • Tilknyttet:
    Forfatter
    ved Ecole Polytechnique Fédérale de Lausanne

Lyesse Laloui

  • Tilknyttet:
    Forfatter
    ved Ecole Polytechnique Fédérale de Lausanne

R.T. Ewy

  • Tilknyttet:
    Forfatter
    ved Chevron
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6th EAGE Shale Workshop 2019, Bordequx, France 28 April - 1 May 2019 .

EAGE, 2019. 2019, European Association of Geoscientists and Engineers (EAGE). Vitenskapelig antologi/Konferanseserie
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