Experimental artefacts in undrained triaxial testing

Details Experimental artefacts in undrained triaxial testing Experimental artefacts in undrained triaxial testing

2010-11-30

arxiv.org/abs/1012.0020v1

European Rock Mechanics Symposium EUROCK 2010, Lausanne : Switzerland (2010)

Physics

Geophysics

Scientific paper

For evaluation of the undrained thermo-poro-elastic properties of saturated porous materials in conventional triaxial cells, it is important to take into account the effect of the dead volume of the drainage system. The compressibility and the thermal expansion of the drainage system along with the dead volume of the fluid filling this system, influence the measured pore pressure and volumetric strain during undrained thermal or mechanical loading in a triaxial cell. A correction method is presented in this paper to correct these effects during an undrained isotropic compression test or an undrained heating test. A parametric study has demonstrated that the porosity and the drained compressibility of the tested material and the ratio of the vol-ume of the drainage system to the one of the tested sample are the key parameters which influence the most the error induced on the measurements by the drainage system.

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