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Triaxial Shear Extension

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geotechniqa

Civil/Environmental
Oct 23, 2008
69
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..?
 
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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.
 
" If you consolidate isotropically (Ko, for example)",
You wanted to say : anisotropically . Did not you..?
 
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