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Triaxial Shear Extension

Triaxial Shear Extension

Triaxial Shear Extension

(OP)
Does Triaxial Shear Extension test imply that the deviatoric stress q =(Simga Vertical-Sigma Horizontal) is negative or the change in deviatoric stress q is negative..?Or both.?
 I know that when the change in q is negative (q decreases) while q still positive means unloading.
When would you order it..?

RE: Triaxial Shear Extension

Triax extension can be run beginning with isotropic consolidation, q=0, so q will go negative right away.  If you consolidate isotropically (Ko, for example), q can still be positive at small extension strains before it becomes negative.

When would I order it?  See Ladd's SHANSEP papers, notably his Terzaghi lecture from 1986(?), which appeared in the ASCE JGE in 88 or 89.

RE: Triaxial Shear Extension

(OP)
" If you consolidate isotropically (Ko, for example)",
You wanted to say : anisotropically . Did not you..?

RE: Triaxial Shear Extension

Right.  Two important letters missing.

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