I am designing drilled pier foundations and the first five layers of the soil profile are silty sand, sandy lean clay, clayey sand, & sandy silty clay? The bottom of the pier rest in the silty sand layer. My question is for such a soil profile would it be accurate to consider at least 60% of skin resistance to be considered. I am designing these foundation mainly for bid purposes. I have 2 soil reports. One just gives the boring log with the soil profiles shown. The other mentions the type of soil for each layer and provides compressive strength, shear strengths, and passive resistance for different depths(all in psf). Both soil report are in the location of the project site.
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