When a UU result show a curve like the one attached what are the explanation possible?
my suggestion is:
- sample not fully saturated and therefore phi>0
the specimen is low plasticity very silty very sandy CLAY
Is this behaviour on UU test curve frequent for this type of cohesive soil?
The reason for this post is that after some soil mechanics reading I am still confused about the phi=0 condition or rather the phi>0 for certain cohesive material in undrained condition.
Beeing in the offshore industry we follow API as recommendation for driven pile capacity. Cohesive material...