ABSTRACT
The article presents the results of experimental studies on the use of lateral stress measurements by using the LS-module (includes full and pore pressure sensors) of 3LSU-CPTU penetrometer to determine the parameters of the natural stress state (NSS) of clay soils (the coefficient of lateral pressure at rest Ko , the effective pre-compaction stress POP, the over-compaction stress σ'c , the overconsolidation ratio OCR, the natural total σho and effective σ'ho horizontal stress in the soil). In experiments, the LS-module with three pairs of sensors located in areas with different diameters (Ø37 mm, Ø41 mm and Ø45 mm) was used. The results of a statistical analysis of the relationships between LS-module (twenty-six direct and derived types were considered) and NSS parameters of clay soils are presented. It is shown that Ko , OCR, σ'ho in the soil is determined with the greatest accuracy.
