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Shear strength of Clayey soils under earthquake

Shear strength of Clayey soils under earthquake

Shear strength of Clayey soils under earthquake

(OP)
: When analyzing clayey soils under earthquake
which shear strength we should use (in principle):
A) Residual undrained shear strength or
B) unconsolidated undrained shear strength obtained from the unconsolidated undrained traixial shear

RE: Shear strength of Clayey soils under earthquake

It isn't one or the other.  For starters, look for a paper by Stark and Contreras in the Feb 1998 ASCE JGGE.  It provides an example of back-analysis of a slide in sensitive clay.  The issues are peak and post-peak undrained strength, and the amount of strain (monotonic and/or cyclic) required to reduce the strength from peak to post-peak to residual/remolded.  Refer also to more recent work by Boulanger and Idriss in the Nov 2006 issue.  

I would be very hesitant to use U-U tests for much.  Sample disturbance, drying, etc. can make the values highly uncertain.  I'd prefer in situ VST and reconsolidated (SHANSEP-like) triax and DSS tests, as appropriate for the geometry of the slide, preferably including cyclic testing.  VST can get you peak and remolded strength for very little $.  I'm assuming from your previous posts that you are talking about high-falutin' numerical analysis, rather than small consulting projects that have to be done on the cheap.  If it was the latter, the VST would be the #1 tool.

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