Regarding the undrained shear strength
Regarding the undrained shear strength
(OP)
1-You get the undrained shear strength from the Vane shear test. Is this equivalent to the one we get from the undrained unconsolidated shear triaxial test.
If yes , which one does it represent.? the peak or the residual one.
2-By the way, can any one refeer me to a source where shear stress-shear strain curves are reported for the undrained unconsolidated tests. I want to see the trends of these curves for different clays
If yes , which one does it represent.? the peak or the residual one.
2-By the way, can any one refeer me to a source where shear stress-shear strain curves are reported for the undrained unconsolidated tests. I want to see the trends of these curves for different clays





RE: Regarding the undrained shear strength
RE: Regarding the undrained shear strength
1-So to confirm: your answer is that both peak and residual can be obtained from Vane shear,but it depends on the way you do the test.
But you did not say which undrained is it the one coresponding to UU test or CU test
2- I am talking about shear stress-shear strain curve obtained from the UU test (PHI=0) and not CU test. This curve is not routinely reported.
RE: Regarding the undrained shear strength
RE: Regarding the undrained shear strength
Is there a way to capture it by FV tests, as in example, limiting the strains (# of revs?)
Would that make a difference in the soft clays investigated by FV?
RE: Regarding the undrained shear strength
I believe that these values you attach represent Peak value of the Undrained Shear Strength.
Note still there is no shear stress-shear strain curve shown for the UU triaxial shear. This doesn't seem to be common output.
I think it is not reported commonly, because the UU is routinely performed on soft clays and thus the peak will differ slightly (if not) from the residual. There is no need to report it . However, for clays with OCR > 3 , it should be reported.
RE: Regarding the undrained shear strength
geotecnicqa - I do not agree that there is no need to report post-peak values except when OCR>3. Stress-strain curves (or stress-rotation curves in the case of VST) should be standard for ALL tests.
RE: Regarding the undrained shear strength
If yes please refer me to a source. My understanding that you cannot capture the stress-strain relation by even the most advanced VST.. correct me if i am wrong please
RE: Regarding the undrained shear strength
RE: Regarding the undrained shear strength
But are you aware of any shear stress-shear strain curves recorded from the unconsolidated undrained shear (not CU test)test ...?
RE: Regarding the undrained shear strength
RE: Regarding the undrained shear strength
RE: Regarding the undrained shear strength
RE: Regarding the undrained shear strength