Dear Awad
Unfortunately I do not have the correct reference, but I think it was
Bjerrum who wrote about the undrained shear strength in normally
consolidated clay. As I recall, and as we have used for the design of parts
of The Øresund link, following estimate can be used:
Cu * 0,3 to 0,4 X s'
I made some test on completely remolded clay till fill (It was
overconsolidated when dregded, but due to the handling of the clay it became
normally consolidated when replaced). I found following: cu * 0,5 X s'.
Of cause the few tests I made is only an indication of the undrained shear
strength in the clay till fill we used, not a sicentific study.
Regards
Dr. Morten Rasmussen, Denmark
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