Triaxial Test Result Troubleshooting

Question

Triaxial Test Result Troubleshooting

jsburk0 (Geotechnical)

(OP)

19 Apr 23 17:47

I recently had a consolidated undrained triaxial test with pore pressure measurements performed and need some assistance in determining if the results look valid. If I am interpreting this correctly, the pore pressure is much greater than the cell pressure. In calculating the effective value, this would yield a negative value for the effective minor stress. Looking for some insight as to whether the results look correct. If not, what would be some issues that would cause the errors. My initial thought is that the pore pressure looks to high, but not sure. I've attached the test report

https://files.engineering.com/getfile.aspx?folder=493de447-495b-47fc-b6f3-3

morecoffeeplz (Civil/Environmental) · Answer 1 · 2023-05-04 21:52:41

the report is graphing total pore pressure during the shear phase, not excess pore pressure. My guess is that the total chamber pressures are roughly 1, 2 and 3 ksf greater than the pore pressure at the beginning of the shearing phase. The strain rate seems reasonable. Not sure why they haven't plotted the effective envelope.

EireChch (Geotechnical) · Answer 2 · 2023-05-23 06:48:20

For some reason the lab has not shown the delta U value, you need this to plot the effective stress mohr circles.

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Triaxial Test Result Troubleshooting