The pore pressures measured in undrained triaxial tests on saturated soils are affected by the system employed for pore pressure measurements. The interference of the measuring system with the pore pressures is caused by the flexibility of the pore pressure measuring device and the tubings, fittings, and valves connecting the triaxials pecimen and the pressure measuring device, and by the compressibility of the fluid (usually water) filling the measuring system.
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Lade et al. (1977) studied this question.
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