Efecto de la estructura sobre la contracción volumétrica de suelos sometidos a procesos de desecación
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Espinel Manrique, Oscar Fabián
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Se realizó un estudio experimental sobre el efecto de la estructura, particularmente de la cementación, en el comportamiento volumétrico de un suelo arcilloso cementado artificialmente. Para esto se indujo al suelo una cementación artificial a través de la reconstitución de una mezcla de arcilla de la sabana de Bogotá y una lechada agua-cemento. Se caracterizó el comportamiento volumétrico del material estructurado, reconstituido y de la arcilla base mediante pruebas de consolidación unidimensional. Para poder determinar el nivel de estructuración inducido en los suelos fabricados, se aisló el efecto de la estructura mediante la normalización de las curvas de compresibilidad con los respectivos parámetros intrínsecos. El efecto de la estructura en el proceso de secado se estudió mediante la comparación de ensayos de contracción volumétrica y curvas de retención suelo-agua de suelos estructurados y sus equivalentes reconstituidos. Se encontró que las relaciones que más se ven afectadas por la estructura en una curva de contracción son la relación de vacíos final y el contenido de agua para el que se presenta el valor de entrada de aire. La trayectoria de la curva de retención se ve afectada principalmente en el rango de baja succión. Para succiones muy altas, las características de retención del suelo no parecen estar significativamente influenciadas por la estructura pues las trayectorias de los suelos estructurados parecen converger a la de los suelos reconstituidos.
Abstract: An experimental study on the effects of the structure on the volumetric behavior of an artificially cemented clay soil was performed. Artificial cementation was induced through the reconstitution of a mixture of Bogota clay and a water-cement slurry. The volumetric behavior of the structured and remolded soils was characterized by one-dimensional consolidation tests. In order to establish the level of structuring induced in the artificial soils, the effect of structure was isolated by normalizing the compressibility curves with the respective intrinsic parameters. The effect of the structure on the drying process was studied by comparing volumetric shrinkage tests and soil-water retention curves of structured soils and their reconstituted equivalents. It was found that the relationships that are most affected by the structure in a contraction curve are the final void ratio and the water content at the air entry value. The path of the retention curve is significantly affected by the structure in the low suction range. However, it appears that soil-water retention curve is not significantly affected by the induced structure in the high suction range. Drying paths of structured soils tent to converge to the reconstituted ones.
Abstract: An experimental study on the effects of the structure on the volumetric behavior of an artificially cemented clay soil was performed. Artificial cementation was induced through the reconstitution of a mixture of Bogota clay and a water-cement slurry. The volumetric behavior of the structured and remolded soils was characterized by one-dimensional consolidation tests. In order to establish the level of structuring induced in the artificial soils, the effect of structure was isolated by normalizing the compressibility curves with the respective intrinsic parameters. The effect of the structure on the drying process was studied by comparing volumetric shrinkage tests and soil-water retention curves of structured soils and their reconstituted equivalents. It was found that the relationships that are most affected by the structure in a contraction curve are the final void ratio and the water content at the air entry value. The path of the retention curve is significantly affected by the structure in the low suction range. However, it appears that soil-water retention curve is not significantly affected by the induced structure in the high suction range. Drying paths of structured soils tent to converge to the reconstituted ones.