<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This article presents the results of laboratory tests on soft, normally consolidated soils from the Vistula Marshlands. Samples of high-plasticity organic soils (muds) taken from 3.2–4.0 m and 9.5–10.0 m depth, as well as peat deposit at 14.0 m, are analysed. Presented case study confirms the applicability of the Norwegian Institute of Technology (NTH) method based on Cone Penetration Tests (CPTU) and allows for a conservative estimation of effective friction angle for muds. The plastification angle equal to 14.5° for organic silt, applied in the modified NTH method, fits well the triaxial test (TX) results. Moreover, the dilative-contractive behaviour according to the CPTU soil classification based on the Robertson’s proposal from 2016 corresponds well with volumetric changes observed in the consolidated drained triaxial compression tests. The internal friction angles of the Vistula Marshlands’ muds and peats are lower in comparison with the database of similar soft soils.</p></abstract>

This article presents the results of laboratory tests on soft, normally consolidated soils from the Vistula Marshlands. Samples of high-plasticity organic soils (muds) taken from 3.2–4.0 m and 9.5–10.0 m depth, as well as peat deposit at 14.0 m, are analysed. Presented case study confirms the applicability of the Norwegian Institute of Technology (NTH) method based on Cone Penetration Tests (CPTU) and allows for a conservative estimation of effective friction angle for muds. The plastification angle equal to 14.5° for organic silt, applied in the modified NTH method, fits well the triaxial test (TX) results. Moreover, the dilative-contractive behaviour according to the CPTU soil classification based on the Robertson’s proposal from 2016 corresponds well with volumetric changes observed in the consolidated drained triaxial compression tests. The internal friction angles of the Vistula Marshlands’ muds and peats are lower in comparison with the database of similar soft soils.

Effective Friction Angle Of Deltaic Soils In The Vistula Marshlands

Studia Geotechnica et Mechanica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Effective Friction Angle Of Deltaic Soils In The Vistula Marshlands"}

This article presents the results of laboratory tests on soft, normally consolidated soils from the Vistula Marshlands. Samples of high-plasticity organic...

Effective Friction Angle Of Deltaic Soils In The Vistula Marshlands

Article Category: Research Article

Published Online: Sep 30, 2019

Page range: 143 - 150

Received: Jan 28, 2019

Accepted: May 29, 2019

DOI: https://doi.org/10.2478/sgem-2019-0016

Keywords
Angle of internal friction, CPTU, triaxial testing, soft soils, peat

© 2019 Kamila Międlarz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Effective Friction Angle Of Deltaic Soils In The Vistula Marshlands

Article Category: Research Article

Published Online: Sep 30, 2019

Page range: 143 - 150

Received: Jan 28, 2019

Accepted: May 29, 2019

DOI: https://doi.org/10.2478/sgem-2019-0016

KeywordsAngle of internal friction, CPTU, triaxial testing, soft soils, peat

© 2019 Kamila Międlarz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Angle of internal friction, CPTU, triaxial testing, soft soils, peat