Hi all,
Please don't get bother that i'm typing lot of questions in here but i like to know many things in geo-technical field as i love it.
Let's consider the question =>
If soil stratum has both layer clay and sand where clay is sandwiched can we do drained for sand and un-drained for clay in one analysis? or do we want to do drained (long term) and un-drained (short term) separately? Since i'm doing ERSS (temporary structures used to retain soil like sheetpile wall) i normally doing analysis containing both drained and un-drained in one analysis (Rsn: short term and don't consider consolidation).
Thanks,
Dear Nitha,
In PLAXIS the drainage type is only considered in case of Plastic and not in a Consolidation analysis. In the former, you will need to configure each material type to be drained and undrained depending on the information you have, while in the latter it is not taken into account as the permeabilities added play an important role whether the calculation will or will not generate excess pore pressures (and how fast these are dissipated).
Dear Mr. Stefanos,
I'm asking is it okay to provide one layer as drained condition and other as un-drained condition in the plastic analysis (GWT at the ground surface)?
Thanks.
Of course, it is possible as most of the times a sand layer and a clay layer typical behave in a different way when loaded in short-term. Then, this can be defined in the material data set.
This is also demonstrated in PLAXIS 2D Tutorial 02: Submerged construction of an excavation - PLAXIS | SOILVISION Wiki - PLAXIS | SOILVISION - Bentley Communities
Thanks for the reply
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