期刊
ENGINEERING GEOLOGY
卷 237, 期 -, 页码 32-41出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.enggeo.2018.02.012
关键词
Laboratory testing; Triaxial tests; Consolidated undrained/drained tests; Opalinus Clay; Clay shale
资金
- Swiss Federal Nuclear Safety Inspectorate ENSI
Consolidated drained and undrained tests with pore pressure measurements were conducted on back-saturated specimens of a clay shale to characterize the influence of confinement and anisotropy on the pore pressure response and effective geomechanical properties (i.e. first-loading E-modulus, stress at onset of dilation and peak strength). Opalinus Clay, a clay shale chosen as host rock for high level nuclear waste in Switzerland was utilized. The result showed that there is a dependency on the confinement of Skempton's pore pressure parameter A and B, the stress at the onset of dilation, and the first-loading E-modulus. Additionally, a change in behavior of the material was observed at effective consolidation stresses between 5 and 8 MPa. The specimens at lower effective consolidation stresses (i.e. heavily overconsolidated specimens) showed a dilatant behavior in the pre-peak region and a significant post-failure stress drop. Specimens consolidated at higher effective consolidation stresses (i.e. slightly overconsolidated to normally consolidated specimens) showed compaction from initial loading until post-peak and a brittle-ductile post-failure behavior. These observations were manifested in pore pressure response curves, effective stress paths and stress-strain curves. Furthermore, they could be correlated to a non-linear appearance of the peak strength failure envelope. An explanation for the non-linear failure envelope related to the dilatant structure of the material is suggested.
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