clay soil cohesion (c) and clay undrained shear strength (Su)
clay soil cohesion (c) and clay undrained shear strength (Su)
(OP)
What is the difference between clay cohesion (c) and undrained strength (Su)?
Where can I find these answers?
Thanks,
Lucy.
Where can I find these answers?
Thanks,
Lucy.





RE: clay soil cohesion (c) and clay undrained shear strength (Su)
f-d
¡papá gordo ain't no madre flaca!
RE: clay soil cohesion (c) and clay undrained shear strength (Su)
For clay we have undrained and drained strengths (Su and S')
Shear strength parameters for undrained strength are Cu & phi(u), whereas those for drained strength are C' & phi'. Since phi(u) is small in the range of 0 to 10 deg., it is used to be neglected, hence Cu = Su.
For geotechnical engineer, C for clay is meaningless; you have either say C' or Cu.
You can find the answer in any geotechnical book which describes about shear strength of cohesive soils, for example 'Introduction to geotechnical Engineering' by Holtz and Kovacs