Abstract
The particle characteristics of sandy soils play a major role in the shear strength response in terms of the flow potential and friction index of partially saturated sandy soils. In this context, a series of an experimental study based on monotonic undrained triaxial compression tests were conducted on two groups of sandy soils with three maximum particle sizes (Dmax = 4.00 mm, 2.00 mm, and 1.00 mm) and two different effective diameters (D10 = 0.08 mm and 0.25 mm). The samples were reconstituted in the laboratory with a wet deposition method at an initial relative density of (Dr = 25%), tested under three different Skempton’s pore pressure parameters (B = 20%, 50%, and 90%) and subjected to a constant confining pressure (P′c = 100 kPa). The obtained test results indicate that the maximum particle size (Dmax) has a significant influence on the shear strength response of the tested sandy soil samples. Indeed, the undrained shear strength increases with the increase of the maximum particle size and it is more significant in the case of the lower Skempton’s pore pressure parameter (B = 20%) compared to the higher and medium ones (B = 50% and B = 90%). However, the maximum particle size can be considered a reliable parameter to predict the steady-state and the instability friction angle, and also it has a noticeable effect on the friction index and the flow potential of sandy soils. Finally, Skempton’s pore pressure parameter could be related to the steady-state and the instability friction angle, the friction index and the flow potential of sandy soils under consideration.
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Abbreviations
- Ai, Bi, and Ci :
-
Soil samples
- B:
-
Skempton’s pore pressure parameter
- Cu :
-
Coefficient of uniformity
- Cc :
-
Coefficient of curvature
- D:
-
Diameter of the sample
- Dmax :
-
Maximum particle diameter
- Dmin :
-
Minimum particle diameter
- D10 :
-
Effective grain size
- D50 :
-
Mean grain size
- Dr :
-
Initial relative density
- ei :
-
Initial void ratio
- emax and emin :
-
Extreme void ratios
- Fc :
-
Fine content
- FI:
-
Friction index
- Gs :
-
Specific gravity
- H:
-
Height of the sample
- P′c :
-
Initial confining pressure
- q:
-
Deviator stress
- qpeak :
-
Undrained peak shear strength
- qss :
-
Steady-state shear strength
- R2 :
-
Coefficient of determination
- USCS:
-
Unified Soil Classification System
- Vf :
-
Flow potential
- ω:
-
Water content
- ins :
-
Instability friction angle
- ss :
-
Steady-state friction angle
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Acknowledgements
This research work was carried out in the Laboratory of Soil Mechanics, Foundation Engineering & Environmental Geotechnics in the context of mutual scientific cooperation between (Laboratory of Material Sciences & Environment) Hassiba Benbouali University of Chlef (Algeria) and Ruhr-Universitat of Bochum (Germany). The authors are thankful to all those who effectively contributed to the achievement of this laboratory investigation.
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The study was financially supported by the Directorate General for Scientific Research and Technological Development, Ministry of Higher Education and Scientific Research (Algeria).
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All authors have contributed to the conception, writing, and design of the submission manuscript. Material collection, sample preparation, and analysis were performed by Mr. Khayreddine Doumi, Dr. Youcef Mahmoudi, Dr. Abdellah Cherif Taiba, Dr. Wiebke Baille, and Pr. Mostefa Belkhatir. The first draft of the manuscript was written by all authors. All authors read and approved the final version of the manuscript.
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Doumi, K., Mahmoudi, Y., Cherif Taiba, A. et al. Influence of the Particle Size on the Flow Potential and Friction Index of Partially Saturated Sandy Soils. Transp. Infrastruct. Geotech. 9, 606–630 (2022). https://doi.org/10.1007/s40515-021-00193-4
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DOI: https://doi.org/10.1007/s40515-021-00193-4