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espanolSe presenta un estudio experimental que examina el comportamiento triaxial isotropico de arenas de relave en un amplio rango de presiones, desde 10 kPa hasta 5 MPa, variando el contenido de finos de las muestras. Los resultados sugieren que la cantidad de finos aumentan la compresibilidad de las arenas de relave depositadas en estado suelto, generando cambios significativos en el indice de vacios al ser confinados en todo el rango de presiones estudiado. Tambien se observa que el efecto de los finos en la compresibilidad disminuye con la disminucion del indice de vacios, exhibiendo incluso una rigidizacion de la muestra para los estados mas densos de confeccion. Resultados de imagenologia realizada post-ensayo sobre el material sugieren que la arena de relave presenta solo rotura de los cantos angulosos al ser consolidada a altas presiones; para indices de vacios bajos se observan diferencias en el contenido de finos de hasta un 4% para la arena limpia. Esta diferencia disminuye al aumentar el contenido de finos de la arena, sugiriendo que la presencia de finos contribuye a la estabilidad de la estructura granular, redistribuyendo los esfuerzos interparticulas, disminuyendo el nivel de rotura. EnglishThis article presents an experimental study that examines the isotropic triaxial behaviour of tailings sands in a wide range of pressures from 10 kPa to 5 MPa, varying the fine content of the tested samples. The results suggest that the presence and quantity of fines have influence in the behaviour: there is an increase in the compressibility of tailings sands deposited in a loose state, generating significant changes in the void ratio when confined throughout the range of pressures studied. In addition, it is observed that the effect of the fines in the compressibility decreases with the decrease of the void ratio, even exhibiting stiffening of the sample for the densest conditions of confection. Results of imaging performed post-test on the material suggest that the tailings sand exhibits a slight breakage of its angular edges when consolidated at high pressures. For low void ratios, differences in fines content of up to 4% are observed for clean sand. This difference decreases when the fine content of the sand increases, suggesting that the presence of fines contributes to the stability of the granular structure, redistributing the interparticle stresses, decreasing the level of breakage.

Comportamiento isotrópico a altas presiones de arenas de relave con finos no plásticos