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On the influence of the spatial distribution of fine content in the hydraulic conductivity of sand-clay mixtures
Sobre la influencia de la distribución espacial del contenido de finos en la conductividad hidráulica de mezclas areno-arcillosas
DOI:
https://doi.org/10.15446/esrj.v22n4.69332Palabras clave:
Sand -clay mixtures, permeability, groundwater flow (en)mezclas areno-arcillosas, permeabilidad, flujo de agua subterranea (es)
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Sand-clay mixtures are one of the most usual types of soils in geotechnical engineering. These soils present a hydraulic conductivity which highly depends on the fine content. In this work, it will be shown, that not only the mean fine content of a soil sample affects its hydraulic conductivity, but also its spatial distribution within the sample. For this purpose, a set of hydraulic conductivity tests with sand-clay mixtures have been conducted to propose an empirical relation of the hydraulic conductivity depending on the fine content. Then, a numerical model of a large scaled hydraulic conductivity test is constructed. In this model, the heterogeneity of the fine content is simulated following a Gaussian distribution. The equivalent hydraulic conductivity resulting of the whole model is then computed and the influence of the spatial distribution of the fine content is evaluated. The results indicate that the hydraulic conductivity is not only related to the mean fine content, but also on its heterogeneity.
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1. Puneet Bhaskar, Burak Boluk, Leila Mosadegh, Aritra Banerjee, Anand J. Puppala. (2020). Effect of Fines on Hysteretic Hydraulic Conductivity of Unsaturated Soil. Geo-Congress 2020. , p.330. https://doi.org/10.1061/9780784482827.037.
2. Ammar El-Husseiny. (2021). Unified Packing Model for Improved Prediction of Porosity and Hydraulic Conductivity of Binary Mixed Soils. Water, 13(4), p.455. https://doi.org/10.3390/w13040455.
3. Tiago Feitosa Gondim, Maria del Pilar Durante Ingunza, Osvaldo de Freitas Neto, Olavo Francisco dos Santos Júnior. (2022). Potencialidade de uso do resíduo da scheelita em sistemas de cobertura de aterro de resíduos. Engenharia Sanitaria e Ambiental, 27(3), p.597. https://doi.org/10.1590/s1413-415220200073.
4. Salima Bouchemella, Said Taibi. (2022). Effect of suction on the mechanical behaviour of unsaturated compacted clay–sand mixtures. Studia Geotechnica et Mechanica, 44(3), p.175. https://doi.org/10.2478/sgem-2022-0016.
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