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Thanks LRJ. I agree that different methods should be adopted for a comparison. There are many papers which have compared different methods, and many papers were published since 2000s. This means that after 70 years since Casagrande (1936), there are still queries on the correctness of each...

BigH, Thanks for your comments. We are aware that there are many methods available apart from the well-known Casagrande method, such as Janbu (1969), Pacheco Silva (1970), Becker et al. (1987) and Karlsrud (1991). All these methods have been compared in Grozic et al. (2003) or Paniagua et...

Mike, Yes, one of the reasons is to minimize the settlement, as we found the settlement is very sensitive to the OCR value because we only have very limited surcharge but a very thick clay layer. That's why the client pays much attention to the quality of the oedometer tests. We think the...

Mike, Thanks for your comments. In our project, the OCR is important, because we get significant settlement in the area of interest, because of the assumption of OCR = 1 by the previous designer. The reason that the previous designer assumed OCR=1 is because the previous oedometer test results...

For incremental loading Oedometer tests, BS1377 - Part 5 - 1990 suggested that for firm to stiff clay, the initial pressure can be the next lower level from the in-situ vertical stress, i.e. 0.5 sig'v. Therefore, at for example 30m depth (assuming effective unit weight of 9kN/m3), the initial...