Sandy clay - Does it have a cu value and Internal friction?
Sandy clay - Does it have a cu value and Internal friction?
(OP)
I have a firm sandy clay, ive said it has a Cu of 40kn/m2, would it have an angle of internal friction value as well, or in undrained conditions it only has shear strength?
I have no lab data just a description to try to model off.
I have no lab data just a description to try to model off.





RE: Sandy clay - Does it have a cu value and Internal friction?
Good discussion here:
http://www.eng-tips.com/viewthread.cfm?qid=292575
RE: Sandy clay - Does it have a cu value and Internal friction?
RE: Sandy clay - Does it have a cu value and Internal friction?
I use phi=0, C=Su for all short-term undrained analyses.
I always do drained design assuming c=0 as highway work considers a design life of 75 years and cohesion has been shown to attenuate over decades of performance - this is often just within the upper 10 or 20 ft, so for me that means for all slope stability analyses.
f-d
ípapß gordo ainÆt no madre flaca!
RE: Sandy clay - Does it have a cu value and Internal friction?
RE: Sandy clay - Does it have a cu value and Internal friction?
f-d
ípapß gordo ainÆt no madre flaca!
RE: Sandy clay - Does it have a cu value and Internal friction?
RE: Sandy clay - Does it have a cu value and Internal friction?
RE: Sandy clay - Does it have a cu value and Internal friction?
I am aware of the works of Mesri's and Ladd's. However, I have experienced opposite behavior in many sites. For example, it is not uncommon to observe 20m same SPT around 10 and same su values from UU test. These sites usually located near seas and rivers. I think Mesri's and Ladd's works are for undisturbed geological conditions. So, the clay has time to consolidate under upper layers.
I have seen engineers that they use these formulas with only one UU. You have to prove and develop your own formula with 3 or more UU test and of course with SPT-CPT analyses.