Retaining wall analysis & design (EN1992) - Design base friction for cohesive soils
Not version-specific
Tekla Tedds
Tekla Tedds for Word
Environment
British Standard
Eurocode
When using clay soil properties I am used to using the Base Adhesion but the Tedds calc asks for the Design Base Friction?
Given that you know the plasticity index of the soil cl 3.2.6 gives you a way of calculating delta_b given phi and phi can be estimated via table 2 from the soil plasticity index.
It is our recommendation the above approach be checked against the code and verified as a suitable approach by the user
Solution
The base resistance to sliding is in accordance with cl 4.2.2.3 of BS8002 which states you can either use the total stress (c_b - base adhesion) or the design base friction (delta_b - angle of base friction given in degrees).Given that you know the plasticity index of the soil cl 3.2.6 gives you a way of calculating delta_b given phi and phi can be estimated via table 2 from the soil plasticity index.
It is our recommendation the above approach be checked against the code and verified as a suitable approach by the user