The constant rate of strain (CRS) oedometer test, using an imposed vertical strain rate εI equal to 10 times the end-of-primary (EOP) vertical strain rate εp, requiring a test duration of about 2 days produces reliable information on both the e versus logσv′ relation and e versus logkv relation of soft clays and fibrous peats. An empirical correction for the strain rate effect on preconsolidation pressure leads to the EOP e versus logσv′ relation and EOP σp′ . The imposed vertical strain rate εI produces excess pore-water pressures at the impervious bottom of the specimen, corresponding to ub′ /σv values in the range of 3%–15% and allows, use of the Darcy flow equation, a reliable calculation of the coefficient of permeability. Compressibility and permeability data are from CRS and incremental loading (IL) oedometer tests on specimen quality designation (SQD) A samples of seven soft clays and two fibrous peats are presented in this paper.
- Constant rate of strain (CRS) consolidation testing
- Fibrous peats
- Soft clays
ASJC Scopus subject areas
- Civil and Structural Engineering