Cn and Phin or Cu + Phiu
I have been dealing with processes from Poland and most recently from Russia and I have a question that maybe the experience of some of you will be helpfull.
For cohesive soils they don't use the undrained shear test - Cu, it is not commom at all to have this parameter as a "basic" one for clays. Instead of this they use Cu and Phiu, in Poland, and Cn and Phin, in Russia. My question is if any of you know how to estimate the Cu, from those parameters. I don't think they are drained parameters.
I will give you some examples:
- A silty clay with Cu=8kPa and Phi=9º
- a silty clay/clay with Cu=31kPa and Phi=9º
Furthermore I was wondering how they will do to input parameters in softwares once the majority of softwares assume Mohr Coulomb for a drained state and Tresca for undrained. I don't think it will be correct to assume, for a short term (so undrained) the numbers given above in Mohr Coulomb criterion (once this way the software will assume a drained condition which is not the case).
Does any of you have experience with those type of parameters and geotechnical design softwares?
Thanks in advance.
Diana Martins Marques