Effect of the volume of the drainage system on the measurement of undrained thermo-poro-elastic parameters

TL;DR

This paper extends correction methods for undrained thermo-poro-elastic measurements in triaxial tests, accounting for drainage system volume effects on pore pressure and volumetric strain, with applications to granular rock tests.

Contribution

It introduces an extended correction method that accounts for volumetric strain measurements, improving accuracy in undrained thermo-poro-elastic property evaluation.

Findings

Correction methods improve measurement accuracy for undrained tests.

Porosity, drained compressibility, and drainage volume ratio significantly affect measurement errors.

Application examples demonstrate the effectiveness of the extended correction method.

Abstract

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 an undrained thermal or mechanical loading in a triaxial cell. The correction methods previously presented by Wissa (1969), Bishop (1976) and Ghabezloo and Sulem (2009) only permit to correct the measured pore pressures during an undrained isotropic compression test or an undrained heating test. An extension of these methods is presented in this paper to correct also the measured volumetric strain and consequently the measured undrained bulk compressibility and undrained thermal expansion coefficients during these tests. Two examples of application of the proposed correction method are presented on the results of an undrained isotropic compression test and an undrained heating test performed on a fluid-saturated granular rock. A parametric study has demonstrated that the porosity and the drained compressibility of the tested material, and the ratio of the volume 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.