En jämförande studie av geotekniska sättningsparametrar mellan CRS-försök och CPT-sondering

This study aims to investigate the correlation between settlement moduli obtained through CRS analysis (Constant Rate of Strain) and other geotechnical parameters, particularly the E-modulus (elasticity modulus). The study includes 11 boreholes and 19 test points from the Norrland coast, where data from CPT soundings (Cone Penetration Test) and laboratory tests were analyzed. The results show a strong quadratic relationship between ML (compression modulus between the preconsolidation pressure and the limit pressure) and the E-modulus, calculated from CPT soundings, with a correlation coefficient R² = 0.8983. A strong quadratic relationship was also identified between M0 (compression modulus below the preconsolidation pressure) and the E-modulus (R² = 0.9135). In addition, correlations were observed between ML and cu (undrained shear strength) from routine investigations and between M0 and qc (cone resistance) from CPT soundings, both with high explanatory power, where R² above 80 % is considered a very strong correlation. No significant correlation could be established between M’ (compression modulus above the limit pressure) and other geotechnical parameters. The discussion highlights that parameters from CPT soundings have the potential to be used for estimating settlement moduli, but further research is required to ensure the reliability of the results. Limitations of the study include the specific geology of the geographic area and the use of empirical relationships that may introduce uncertainties. The conclusion is that strong correlations between settlement moduli and geotechnical parameters can be demonstrated, especially in very soft soils. However, further research is needed to validate these findings.