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Questionable Result from CUP Triaxial Test

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learning2geotech

learning2geotech

Civil/Environmental
Apr 4, 2019
38
See attached photo. Phi effective is 39 degrees. The result seems questionable because it is very high for this soil, which is silty sand, at 8ft depth, and has a N-value of 4. Based on the lab report, where do you think the lab procedure went wrong?


Screenshot_2022-08-28_014902_ceibrx.jpg
 
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Where to start?

What's the Gs of this material? The water content and densities seem suspect. Also, it was sheared too quickly.
 
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