Determination of the characteristic values of the undrained shear strength of organic soils according to Eurocode 7
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1
Faculty of Civil Engineering and Environmental Sciences,, Bialystok University of Technology, Poland
2
Department of Geotechnical Engineering, Institute of Civil Engineering, Warsaw University of Life Sciences - SGGW, Poland
Submission date: 2023-05-02
Acceptance date: 2023-05-09
Publication date: 2024-04-01
Corresponding author
Maria Jolanta Sulewska
Faculty of Civil Engineering and Environmental Sciences,, Bialystok University of Technology, Wiejska 45E, 15-351, Bialystok, Poland
Archives of Civil Engineering 2024;(1):39-52
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ABSTRACT
The paper presents the methods of determining the characteristic value on the basis of the standards: PN-B-03020:1981, PN-EN 1997-1:2008, prEN 1997-1:2022-09 and Schneider formula. Determination of the characteristic value of the undrained shear strength τfu was carried out using statistical method on the basis of the prEN 1997-1:2022-09 standard and Schneider formula. The statistical calculations were based on the results of field vane tests carried out in organic subsoil of test embankment in Antoniny test site before loading and after the 2nd embankment stage. In order to determine the undrained shear strength τfu of organic soils from field vane tests, the measured values of shear strength τfv were corrected using the average values of correction factors µ=µ(lab) determined on the basis of triaxial compression, simple shear and triaxial extension tests. The analysis of the calculation results shows that with relatively numerous data sets, large values of the coefficient of variation Vx result in significantly lower characteristic values of τfu obtained according to prEN 1997-1:2022-09, compared to the values obtained according to the Schneider formula. In the case of few data sets, for which high values of the coefficient kn are obtained, with high values of the coefficient of variation Vx, the comparison of the values according to prEN 1997-1:2022-09 with the values obtained according to the Schneider formula shows the greatest differences.