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Effect of suction on the mechanical behaviour of unsaturated compacted clay–sand mixtures

Salima Bouchemella
Salima Bouchemella
 e 
Said Taibi
Said Taibi
   | 09 set 2022
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Article Category: Original Study
Pubblicato online: 09 set 2022
Pagine: 175 - 189
Ricevuto: 27 ott 2021
Accettato: 21 mar 2022
DOI: https://doi.org/10.2478/sgem-2022-0016
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© 2022 Salima Bouchemella et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Grain size distribution curves of the tested soils.
Grain size distribution curves of the tested soils.

Figure 2

Atterberg limits of the tested soils.LL: liquid limit, PI: plasticity index
Atterberg limits of the tested soils.LL: liquid limit, PI: plasticity index

Figure 3

LL and PI versus SP.LL: liquid limit, PI: plasticity index, SP: sand percentage
LL and PI versus SP.LL: liquid limit, PI: plasticity index, SP: sand percentage

Figure 4

Compaction characteristics for the kaolinite 100K and 75K25S, 50K50S mixtures.
Compaction characteristics for the kaolinite 100K and 75K25S, 50K50S mixtures.

Figure 5

Compacted sample device.
Compacted sample device.

Figure 6

E50 modulus definition.
E50 modulus definition.

Figure 7

Wetting–drying paths of compacted samples of kaolinite 100K and mixtures 75K25S and 50K50S.
Wetting–drying paths of compacted samples of kaolinite 100K and mixtures 75K25S and 50K50S.

Figure 8

The relationship between: a) void ratio eSl, b) water content wsl and c) suction ssl of shrinkage limit versus SP.SP: sand percentage
The relationship between: a) void ratio eSl, b) water content wsl and c) suction ssl of shrinkage limit versus SP.SP: sand percentage

Figure 9

Void ratio for wetting paths of different soils compacted in SPO conditions.
Void ratio for wetting paths of different soils compacted in SPO conditions.

Figure 10

Normalised water contents for the wetting paths of different soils compacted in SPO conditions.
Normalised water contents for the wetting paths of different soils compacted in SPO conditions.

Figure 11

Relationship between a) deviatoric stress and axial strain for kaolinite and mixture samples, b) UCS and sand percentage, in SPO conditions. UCS: unconfined compressive strength.
Relationship between a) deviatoric stress and axial strain for kaolinite and mixture samples, b) UCS and sand percentage, in SPO conditions. UCS: unconfined compressive strength.

Figure 12

Relationship between E50 modulus and sand percentage for kaolinite and mixture samples in SPO conditions.
Relationship between E50 modulus and sand percentage for kaolinite and mixture samples in SPO conditions.

Figure 13

Relationship between UCS and a) water content, b) suction for 100K and mixture samples.. UCS: unconfined compressive strength
Relationship between UCS and a) water content, b) suction for 100K and mixture samples.. UCS: unconfined compressive strength

Figure 14

Relationship between E50 modulus and a) water content and b) suction for 100K and mixture samples.
Relationship between E50 modulus and a) water content and b) suction for 100K and mixture samples.

Figure 15

Relationship between E50 modulus and UCS. UCS: unconfined compressive strength.
Relationship between E50 modulus and UCS. UCS: unconfined compressive strength.

Geotechnical properties of the tested soils.

Cc Cu <80 μm, <2 μm, LL, PL, PI, wSPO, ρdmax,
Material % % % % % % g/cm3
Kaolinite 100K (Kheirbek-Saoud 1994) [33] 0.44 11.67 100 58 40 20 20 17.2 1.7
Sand 0.67 3,15 0 0 - - - - -
75K25S 0.25 25 77 43 31.7 18.5 13.2 15.8 1.77
50K50S 0.067 913.04 53 36 25.1 14.8 10.3 12 1.93

Comparison between measured and correlated γdmax and wSPO.

Soils LL, Measured Correlated Error Measured Correlated Error
% wSPO, % wSPO, % ΔwSPO, % γdmax, kN/m3 γdmax, kN/m3 Δγdmax, kN/m3
100K 40 17.2 18.5 1.3 17 16.9 0.1
75K25S 31.7 15.8 15.4 0.4 17.7 17.7 0
50K50S 25.1 12 12.8 0.8 19.3 18.3 1.0

Initial conditions of drying–wetting test.

Material LL, wSPO, ρdmax, si measured, si correlated,
% % g/cm3 MPa MPa
100K 40 17.2 1.7 1.12 0.729
75K25S 31.7 15.8 1.77 0.59 0.644
50K50S 25.1 12 1.93 0.398 0.339
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