drained triaxial test: pore pressure-volume change relation

[renirani]

Hello all,

I need to determine volume change from drained triaxial data. the column data supplied are: sigma1, sigma3, p', q, axial strain,phy, and pore water pressure. I tried to search trough internet for such a way of calculation, but no result satify me. I just feel that it should be a relation between pore pressure and volume change.

wishing any of you can give a clear idea.
thanks

 

[Panars]

Because the test was drained, the pore pressure should have stayed relatively constant. There would not be a relationship between volume change and pore pressure. For a drained test, the change in volume is usually determined by measuring the volume of water that is "pushed" out of the sample. So there should be another column of data that has shange in volume of water in the sample.

 

[renirani]

Hi Panars,

Thanks. After checking many times the trend of all column, I realized that the data given to me has wrong column header. the pwp and phy column should be volumetric strain and void ratio change, thats why I was very confuse to calculate before.

Sorry for bothering you all

regards,
farid