| Abstract [eng] |
The aim of this study is to determine the key parameters (physical and mechanical properties, seismic waves velocities) of soils of different age, genesis, and type, and, based on the obtained data, to develop multiple regression equations that would allow for the prediction of undrained shear strength cu values. Undisturbed soil samples were collected in the districts of Anykščiai, Naujoji Akmenė, Telšiai, and Alytus, and shallow seismic tests were conducted in the same boreholes to determine shear and compressional waves velocities. Field and laboratory testing revealed that the soil particle distribution influences the variation in shear wave velocity—sand, on average, increases the velocity by +24,65% from the mean, while clay decreases it by -16,10%. Gravel and silt fractions also affect the velocity, but the impact is less significant. The established correlation curves allow the estimation of undrained shear strength cu based on known soil properties and additional information—genesis, age, and soil type. Shear wave velocity, density, and the content of clay and sand fractions showed the highest significance in the regression models. The silt and gravel fractions were the least significant; when these parameters were removed, the correlation coefficient increased, and the model became more accurate. |
