The compression behaviour of Canadian oil sands
International audience The compression behaviour of Canadian oil sands was investigated by running high stress oedometer compression tests up to 65 MPa. X-Ray microtomography investigation confirmed the significant disturbance affecting the core samples, showing large pores located between dense int...
Published in: | Journal of Geotechnical and Geoenvironmental Engineering |
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Main Authors: | , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2012
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Subjects: | |
Online Access: | https://hal.science/hal-01084234 https://doi.org/10.1061/(ASCE)GT.1943-5606.0000808 |
Summary: | International audience The compression behaviour of Canadian oil sands was investigated by running high stress oedometer compression tests up to 65 MPa. X-Ray microtomography investigation confirmed the significant disturbance affecting the core samples, showing large pores located between dense intact clusters made up of angular sand grains. Compression tests confirmed the significant effects of disturbance on the compression characteristics, providing a much softer response without any memory of the significant load applied by the 3 – 4 km thick ice sheet during the Quaternary period. High stress compression allowed to bring back the samples close to the in-situ estimated porosity, providing compression characteristics (estimated from a loading cycle) close to the intact ones, in spite of obvious differences in fabric (including the effects due to grain crushing at high stress). Creep behaviour was also observed and an estimation of the order of magnitude of the creep strain corresponding to the Quaternary period is provided. |
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