Publication: Comportamiento geotécnico de suelos arcillosos compactados, respuesta a cargas estáticas y dinámicas
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2019-06-21
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Universidad Complutense de Madrid
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Abstract
La presente tesis está basada en el estudio experimental de las propiedades ingenieriles de suelos arcillosos expansivos compactados; respuesta a cargas estáticas y dinámicas; y la viabilidad del uso de materiales granulares (arenas) como aditivo para la mejora de estas propiedades. El suelo investigado procede de la formación Arcillas Azules del Guadalquivir (AAG). Las AAG son suelos de grano fino con un porcentaje de fracción arcillosa entre 50 y 60% y están clasificadas como CH (Arcilla de alta plasticidad). Poseen una composición mineralógica homogénea representada principalmente por minerales de la arcilla tipo esmectita e illita, además de calcita y cuarzo, y en menor proporción por yeso. Estos suelos serían clasificados como marginales-inadecuados para su puesta en obra por su elevada plasticidad y expansividad. En la mayoría de los trabajos ingenieriles, para la mejora de las propiedades geotécnicas problemáticas, es recomendable el uso de cal o aditivos químicos basados en las reacciones rápidas de intercambios iónicos y en las reacciones lentas puzolánicas cal-suelo. No obstante, su efectividad para algunos tipos de arcillas está limitada a la reducción del límite líquido y con ello del límite plástico, siendo insignificante para suelos arcillosos ricos en calcio debido a la baja interacción de la arcilla con estos aditivos...
This PhD thesis represents an experimental study about engineering properties of compacted expansive clayey soils; static and dynamic loading response; and the viability of the use of granular materials (sand) as an additive for the improvement of these properties. The investigated soil belongs to the known Guadalquivir Blue Clay (GBC). The GBC are fine grained soils with an average percentage of clay fraction between 50 and 60 %, classified as CH (High plasticity Clay). The mineralogical composition is homogenous, mainly constituted of clay minerals such as smectite and illite, among them calcite and quartz which constitute the main rock minerals, and with small quantities of gypsum. These soils are classified as marginal-inadequate for their use in engineering works due to their high plasticity and swelling behaviour. Lime or other chemical additives are recommended to circumvent some of the engineering problems associated with earthworks, this is based on the principle of rapid ion exchange reactions and slower soil–lime pozzolanic reactions. However, the effectiveness of this solution for some types of clays is limited to the reduction of LL (liquid limit) together with LP (plastic limit) and is insignificant for calcium rich clay soils because of the low interaction between clay and additives...
This PhD thesis represents an experimental study about engineering properties of compacted expansive clayey soils; static and dynamic loading response; and the viability of the use of granular materials (sand) as an additive for the improvement of these properties. The investigated soil belongs to the known Guadalquivir Blue Clay (GBC). The GBC are fine grained soils with an average percentage of clay fraction between 50 and 60 %, classified as CH (High plasticity Clay). The mineralogical composition is homogenous, mainly constituted of clay minerals such as smectite and illite, among them calcite and quartz which constitute the main rock minerals, and with small quantities of gypsum. These soils are classified as marginal-inadequate for their use in engineering works due to their high plasticity and swelling behaviour. Lime or other chemical additives are recommended to circumvent some of the engineering problems associated with earthworks, this is based on the principle of rapid ion exchange reactions and slower soil–lime pozzolanic reactions. However, the effectiveness of this solution for some types of clays is limited to the reduction of LL (liquid limit) together with LP (plastic limit) and is insignificant for calcium rich clay soils because of the low interaction between clay and additives...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Geológicas, Departamento de Geodinámica, leída el 28/09/2018