Yes, I have read the books that 2/3 would be a good idea but that only applied to the soil profile with clay material only as they have not yet consolidated.
But thanx for your advice
Hi, My name is Tim, I am currently working on a foundation design project concerning the negative skin friction. I used to think that the depth of NSF developed should extend to the whole soil layer described as marine clay. But I was told later that the SPT value would give a hint to choose the...