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BigH, I'm sure Norweigian Quick Clay and Canada's have their own nasty behaviors. I use to have to deal with New Orleans Gumbo clay. Focht3, your right about confined silts; still a pain to get good geotechnical properties to design piles in (was starting to get a handle on using CPT data...

Your foundation design needs to take more into account than the sub base (subgrade) characteristics. One should look at the soils to at least twice the depth of the footing proposed. If indeed you have CBR of 1% I would want to know have far this material extends and what the percent passing...

A coorelation between SPT and NSF have no direct relationships. For a marine clay, an SPT is not a good test to establish the materials stress history in order to determine its consolidation state. But as a general rule one should be able to calculate the vertical effective stress, then assess...