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Oedometer for laboratory test of peat and peaty soil

https://doi.org/10.22227/2305-5502.2025.1.8

Abstract

Introduction. Friction forces have a significant impact on results of the long-time compression tests of peat and peaty soils. Forces occur at the contact between the lateral surface of the sample and the metal ring during compression tests. The authors have developed an oedometer that allows to increase the reliability of laboratory test results by determining the compressibility characteristics taking friction impact into account.

Materials and methods. The oedometer was made by plastic additive manufacturing except for bronze ring. The diameter of the sample is 8.6 cm and the initial height of the sample is 3 or 5 cm. After stabilization of deformations void in the base of the odometer is released and a monotonically increasing load was applied to the upper part of the sample until the “breakdown” at the contact between the lateral surface of the peat sample and the ring. At the same time loosening of the sample was prevented by keeping samples with bolts. The studied peat had the following properties: density 0.98–1.02 g/cm3, water content 861–930 %, void ratio 11.8–14.2, decomposition degree 40–45 %. The tests were carried out at vertical stresses equal to 50 and 100 kPa respectively.

Results. Tests showed that up to 15–20 % of the load applied to the sample is required to overcome friction forces. This phenomenon should be taken into account in determining compressibility characteristics by adjusting the current load on the sample.

Conclusions. The advantage of the oedometer is the determination of compressibility characteristics including compression index taking into account the measurement error occurring from the friction forces at the contact of the sample with the ring. The manufacture of geotechnical devices by 3D printing is non-cost and time-consuming. This also makes it easier to modify the design during testing and simplifies the manufacture of spare parts.

About the Authors

G. Yu. Ivakhnova
Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU)
Russian Federation

Galina Yu. Ivakhnova — postgraduate student of the Department of Geotechnics

17 Severnaya Dvina emb., Arkhangelsk, 163002

RSCI AuthorID: 1044892, Scopus: 57219992412



A. A. Korshunov
Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU)
Russian Federation

Alexey A. Korshunov — Candidate of Technical Sciences, Associate Professor, Head of Department, Department of Engineering Geology, Foundations and Foundations

17 Severnaya Dvina emb., Arkhangelsk, 163002

Scopus: 56203452100, ResearcherID: ABB-7422-2020



A. L. Nevzorov
Northern (Arctic) Federal University named after M.V. Lomonosov (NArFU)
Russian Federation

Alexander L. Nevzorov — Doctor of Technical Sciences, Professor, Professor of the Department of Engineering Geology, Foundations and Foundations

17 Severnaya Dvina emb., Arkhangelsk, 163002

RSCI AuthorID: 393637, Scopus: 7004203097, ResearcherID: J-2809-2012



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Review

For citations:


Ivakhnova G.Yu., Korshunov A.A., Nevzorov A.L. Oedometer for laboratory test of peat and peaty soil. Construction: Science and Education. 2025;15(1):81-87. (In Russ.) https://doi.org/10.22227/2305-5502.2025.1.8

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