Permeability measurement in porous media under unsaturated paths
Medición de permeabilidad en medios porosos bajo trayectorias no saturadas
DOI:
https://doi.org/10.15446/dyna.v88n219.95162Palabras clave:
hydraulic conductivity;, permeability;, suction;, unsaturated soils (en)conductividad hidráulica;, permeabilidad;, succión;, suelos parcialmente saturados. (es)
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Understanding the flow through porous media when it is part of geotechnical-hydraulic structures has been a scenario calculated from the most unfavorable situation. The passage of water through the porous skeleton of the soil is considered in a saturated condition. Few studies to date consider partially saturated trajectories regarding the influence on the stability of a dam, reservoir, embankment, among others. Estimating the speed with which the fluid under analysis flows through a partially saturated media is challenging to perform by conventional methods. By contrast, nowadays, it is easy to obtain for saturated soil. This study aimed to measure hydraulic conductivity (coefficient of permeability) in granular soils using easily accessible laboratory techniques. The permeability in unsaturated conditions will be measured, varying the suction in the sample, which is an essential requirement when there is a situation of partial saturation. The results provided data on the permeability values that allow to obtain a very evident difference between both proposed conditions.
El entendimiento del flujo a través de medios porosos cuando hace parte de estructuras geotécnico-hidráulicas, a través del tiempo ha sido un escenario calculado desde la situación más desfavorable. Es decir, el paso del agua por el tejido poroso del suelo siempre se considera en una condición saturada. Pocos estudios a la fecha, consideran trayectorias parcialmente saturadas, en cuanto a la influencia sobre la estabilidad de una presa, reservorio, terraplén, entre otros. La estimación de la velocidad con la que el fluido bajo análisis traspasa un medio parcialmente saturado, es difícil de realizar mediante métodos convencionales. Antagónicamente, hoy día es sencilla de obtener para un suelo saturado. El objetivo de este estudio consistió en intentar medir la conductividad hidráulica (coeficiente de permeabilidad), en suelos granulares usando técnicas de laboratorio de fácil acceso. La permeabilidad en condición no saturada fue medida, variando la succión en la muestra, lo cual es requisito esencial cuando existe una situación de saturación parcial. Los resultados arrojan datos sobre los valores de permeabilidad que permiten trazar una diferencia muy evidente entre ambas condiciones propuestas.
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1. Jhan Piero Rojas, Juan Carlos Ruge, Gustavo Adolfo Carrillo. (2022). Unsaturated Hydraulic Conductivity in Composite Porous Media. Applied Sciences, 12(18), p.9058. https://doi.org/10.3390/app12189058.
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