Effetto del chimismo del fluido interstiziale sulle proprietà di plasticità dei terreni a grana fine

Il presente lavoro di tesi ha l’obiettivo di esporre lo studio effettuato sulla classificazione dei terreni a grana fine, ovvero quella gamma di terreni con particelle passanti al setaccio ASTM 200 da 75μm, al variare del tipo di fluido interstiziale, con particolare interesse nei riguardi del limite di liquidità e della sensitività elettrica, dei legami chimico-elettrici interparticellari e di tessuto, e degli effetti sulle caratteristiche meccaniche del mezzo.
In molti problemi di carattere geotecnico, la catalogazione dei suoli è fondamentale, perché aiuta gli ingegneri ad anticipare la risposta del terreno e le proprietà fisiche.
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In this thesis is described a new type of classification about fine-grained soils, based on electrical sensitivity and pore-fluid chemistry, with particular interest about liquid limit, chemical-electrical interparticle bounds, composition of fabric, and effects on the mechanical and plasticity features.
A lot of geotechnical problems are founded on soils classification, because it helps to forecast ground’s behavior and its physical properties.
Currently every kind of fine-grained sediment can be described through “Atterberg Limits” that defines the phase changes of the material, according to the water content. Besides they are the basis of “Casagrande’s Plasticity Chart”, used by the “Unified Soil Classification System” (USCS).
The Liquid Limit is the lower water content that origins a ground scrolling, by consequence of a tiny pressure. This is the dominant parameter to define the plastic ratio of plastic soils, and therefore it’s the beginning point for a new labeling category.
Whereas several geotechnical problems also depends on pore-fluid’s variations, the observation is focused on the relations between liquid limit and fluids like deionized water, 2M NaCl brine and kerosene, that’s why these three fluids have a noteworthy influence on the chemical, electrical and mechanical interactions of ground’s microscopic grains.
Therefore, this study represents an early technical and experimental analysis about this topic, and proposes itself as a prologue for the future researches.