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Effect of fibre content on the geotechnical properties of peat

Iwona Chmielewska
Iwona Chmielewska
   | 09 mar 2023
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Article Category: Original Study
Pubblicato online: 09 mar 2023
Pagine: 133 - 143
Ricevuto: 09 mag 2022
Accettato: 06 dic 2022
DOI: https://doi.org/10.2478/sgem-2023-0003
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© 2023 Iwona Chmielewska, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Peatlands in Poland and the location of the study area (based on Majtyka, 2013).
Peatlands in Poland and the location of the study area (based on Majtyka, 2013).

Figure 2

Set of oedometers used for the tests.
Set of oedometers used for the tests.

Figure 3

The relation between organic content Iom and natural water content wn.
The relation between organic content Iom and natural water content wn.

Figure 4

The relation between bulk density ρ and initial void ratio e0.
The relation between bulk density ρ and initial void ratio e0.

Figure 5

The relation between natural water content wn and the initial void ratio e0.
The relation between natural water content wn and the initial void ratio e0.

Figure 6

The relation between vertical strain ɛv and effective vertical stress σv′.
The relation between vertical strain ɛv and effective vertical stress σv′.

Figure 7

Vertical strain ɛv versus time t depending on the stress level σv for (a) fibric peat, (b) hemic peat, (c) sapric peat.
Vertical strain ɛv versus time t depending on the stress level σv for (a) fibric peat, (b) hemic peat, (c) sapric peat.

Figure 8

The relation between (a) void ratio e and effective vertical stress σv′ and (b) effective vertical stress σv′ and void ratio e.
The relation between (a) void ratio e and effective vertical stress σv′ and (b) effective vertical stress σv′ and void ratio e.

Figure 9

The relation between compression index Cc and (a) natural water content wn and (b) initial void ratio e0.
The relation between compression index Cc and (a) natural water content wn and (b) initial void ratio e0.

Figure 10

Secondary compression index Cα versus compression index Cc.
Secondary compression index Cα versus compression index Cc.

Degree of decomposition of peat soil based on the von Post scale (Landva and Pheeney, 1980).

Peat classification Decomposition Plant structure Material extruded on squeezing (passing between fingers)
Fibric peat H1 None Easily identified Clear, colourless water
H2 Insignificant Easily identified Yellowish water
H3 Very slight Still identifiable Brown, muddy water
H4 Slight Not easily identified Dark brown, muddy water
Hemic peat H5 Moderate Recognisable, but vague Muddy water and some peat
H6 Moderately strong Indistinct About one-third of peat squeezed out, dark brown water
Sapric peat H7 Strong Faintly recognisable About one-half of peat squeezed out, very dark brown water
H8 Very strong Very indistinct About two-thirds of peat squeezed out, also some pasty water
H9 Nearly complete Almost unrecognisable Nearly all the peat squeezed out as a paste
H10 Complete No discernible All the peat passes between the fingers, no free water visible

Physical properties of the tested peat.

Peat designation P1 P2 P3 P4 P5 P6 P7 P8
Depth of sampling (m) 3.1 1.9 2.3 3.6 4.7 5.0 1.0 1.4
Bulk density ρ (g/cm3) 1.010 1.045 1.039 1.029 1.034 1.031 1.127 1.112
Particle density ρs (g/cm3) 1.443 1.473 1.530 1.461 1.524 1.489 1.474 1.492
Natural water content wn (%) 828.3 465.4 335.7 449.0 315.8 451.4 236.5 320.2
Organic content Iom (%) 94.86 90.73 83.42 92.39 84.16 88.57 90.61 88.23
Initial void ratio e0 (−) 12.26 6.969 5.415 6.794 5.156 6.963 3.399 4.638
Degree of decomposition H3 H5 H6 H5 H6 H5 H8 H7
Peat classification Fibric Hemic Sapric

Averaged values of the constrained modulus of the tested peat.

Vertical stress (kPa) Constrained modulus Eoed (kPa)
Fibric peat Hemic peat Sapric peat
15 181.7 266.9 683.8
32 111.6 179.9 321.5
64 186.8 224.7 348.5
96 327.4 Not investigated Not investigated
128 Not investigated 534.0 428.0
256 Not investigated Not investigated 738.9
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Lingua:
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Geosciences, other, Materials Sciences, Composites, Porous Materials, Physics, Mechanics and Fluid Dynamics
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