What is the relationship between he undrained shear strengh(Su) and the unconfined compressive strength(qu) of a soft clay? AASHTO gives simplified pressure distributions with values based on the undrained shear strength for cohesive soils. My boring data gives 0.7 tsf for qu and SPT N values ranging fom 2-4. I have been told that one can assume that Su=0.5qu, but this is also the value for cohesion (c). Any help is appreciated.
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