Hi, I've been trying to find out how to determine the undrained shear strength of soil without having the unconfined compressive strength. I have 6 geotech reports, of which none tell me the unconfined compressive strength for the depth I need to bury my piping model. I do have the plasticity limits, STP test blows, and type of soil. I'm trying to get a more accurate model but cannot find anything that shows a correlation or alternative way to determine the undrained shear strength. Does anyone have any idea how to do this or an efficient way to get at least semi accurate data?