Bishop and Henkel, The Measurement of Soil Properties in the Triaxial Test
Bishop and Henkel, The Measurement of Soil Properties in the Triaxial Test
(OP)
Can someone please tell me where in this document (or maybe another) to find a discussion on what the confining pressure should be in a triaxial test? One of our senior engineers told me the confining pressure in a UU 1-point triaxial test should be equivalent to the total overburden at the depth the sample was taken. I assume no earth pressure coefficient should be applied? I also have skimmed the posts on this site regarding this topic and I have read different recommendations?
I have read through quite a few different references and manuals and can't find the answer I am searching for.
I have read through quite a few different references and manuals and can't find the answer I am searching for.





RE: Bishop and Henkel, The Measurement of Soil Properties in the Triaxial Test
K0 comes into it when you are reconsolidating a test (e.g. CIU, CID, CAU, CAD, etc.). The confining pressure in a UU test is just the cell pressure - there is no axial component since you are not consolidating it (Unconsolidated Undrained).
RE: Bishop and Henkel, The Measurement of Soil Properties in the Triaxial Test
So in theory, the cell pressure should not make a difference if the sample is saturated. If the spil is partially saturated that is a different story. I just wasn't sure if the total overburden was correct to use. I will continue to use it however.
RE: Bishop and Henkel, The Measurement of Soil Properties in the Triaxial Test
RE: Bishop and Henkel, The Measurement of Soil Properties in the Triaxial Test
Mike Lambert
RE: Bishop and Henkel, The Measurement of Soil Properties in the Triaxial Test
According to theory, they'd all be the same - i.e., if they're all saturated. However, there is no guarantee that a clay sample below the water table is saturated. (I recognize that in another thread we have a reader who doesn't agree with this claim.) So, if you use three different confinements on a UU test, you may find that the undrained shear strength is not phi=0.
Not to get too impractical that is. . .
f-d
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