Are there any standard classification of clay based on undrained shear strength?
Are there any standard classification of clay based on undrained shear strength?
(OP)
[b][/b]that means very soft , sot ,midium ,stiff ect vs Su
Ifound some pic from web{attatched}. But are they any standard like ASTM or BS or IS ?
Please give a standard ref.
Ifound some pic from web{attatched}. But are they any standard like ASTM or BS or IS ?
Please give a standard ref.





RE: Are there any standard classification of clay based on undrained shear strength?
RE: Are there any standard classification of clay based on undrained shear strength?
RE: Are there any standard classification of clay based on undrained shear strength?
This has become automatic for me (the "N" correlations are generally accepted but depending on the plasticity there are "other correlations" - best if site specific for general use):
0 to 12.5 kPa - very soft (N = 0 to 2)
12.5 to 25 kPa - soft (N = 2 to 4)
25 to 50 kPa - firm (N = 4 to 8)
50 to 100 kPa - stiff (N = 8 to 15)
100 to 200 kPa - very stiff (N = 15 to 30)
>200 kPa - hard (N > 30)
You can find a similar thing though in BS 2004 CP Table 6. As typical the Brits have a slightly different take on things (have put the accepted North American range in parentheses):
< 20 kPa - very soft (0 to 12.5)
20 to 40 kPa - soft (12.5 to 25)
40 to 50 kPa - soft to firm
50 to 75 kPa - firm (25 to 50)
75 to 100 kPa - firm to stiff
100 to 150 kPa - stiff (50 to 100)
> 150 kPa - very stiff (100 to 200)
hard: (> 200)
Bottom Line - when you use the descriptor terms - be careful if "accepted Practice" or BS Code of Practice.