Correlation of unconsolidated undrained shear strength of clay soils between uniaxial and triaxial test results
2024
Burlakovs, Juris | Krievans, Maris | Krope, Daira | Zekker, Ivar | Vincevica-Gaile, Zane | Krauklis, Andrey | Vilnitis, Martins
The instability and potential threats for accidents in the foundation of prospective areas of energy infrastructure exist due to the complicated mechanical properties of soft soil in marine and glacial deposit regions. Before the construction of energy infrastructure, such as the installation of wind generators, solar panels, or power lines, it is desirable to carry out a geotechnical study, including field and laboratory tests to determine the mechanical properties of soil, including testing of the unconfined shear strength or compressive strength. Due to naturally large pore diameter and high porosity, the rapid permeability increase may destroy loose cementation. However, clay minerals’ geotechnical properties change in triaxial confinement conditions, meaning the moisture increases followed by permeability fluctuations. In planning infrastructure works, these properties must be considered as properties influenced dramatically by dynamic conditions. Inaccurately obtained results on the mechanical parameters of the soil may have wrong results on the capacity of load and compressive strength determined in the laboratory, which may differ significantly in nature. It is essential to scale the factors when it would be advisable to perform an unconsolidated undrained triaxial test instead of a uniaxial test to obtain more accurate results. The triaxial test provides more accurate results using the pressure within the soil sample.
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