We have sheared numerous loose samples of sandy soils in undrained TXC conditions. A common behavior observed herein was dilatancy in stress paths at the first stages of shearing.
Normally, it's expected to obtain a full contraction behavior until reaching the steady state for very loose specimens, or contraction then dilation as for the void ratios decreases from very loose to loose and mid-dense samples. Meanwhile, a subtle preliminary dilatancy is unavoidable under all conditions tested. Although the samples are fully saturated with B values of 0.97 or higher and the errors of sample preparation using the wet-tamping method which results in anisotropy and preloading are eliminated, the dilation-contraction-dilation behavior still remains. Since we are struggling to go through correct tests achieveing contraction-dilation behavior, any comments to aid me in overcoming this issue would be helpful.
Regards,
Answer is here (in Russian, sorry) https://www.youtube.com/watch?v=f7J30Lkk54g
Also enclosed text is the State sandard for Laboratory testing of Soils. https://euro-test.ru/Pub.Lib/Normativ_docs/GOST30416.pdf
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