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Ignore Circle in CU Triaxial Shear Test

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learning2geotech

learning2geotech

Civil/Environmental
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See attached image, can i ignore the 2nd effective circle and draw a steeper failure envelope connecting the 1st and 3rd effective circles (blue)? What are the reasons of when that can be done or not allowed or not recommended?
 

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nothing is s'allowed' or 'not allowed', how you interpret a test is up to you and you have to have justification for it. Impossible for anyone else to answer without knowing the back story/context
 
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