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Erschienen in:
2020 | OriginalPaper | Buchkapitel
Exploring Static Instability Behavior of Sand-Fines Mixtures Based on Different State Variables
verfasst von : Daniela D. Porcino, Giuseppe Tomasello
Erschienen in: Geotechnical Research for Land Protection and Development
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Abstract
The paper presents a study aimed at evaluating the effect of non-plastic fines on undrained static liquefaction and instability behavior of silty sands considering two different state variables: (global) void ratio (eo) and equivalent granular void ratio (e*). The last parameter was introduced as an alternative index for mixed soils with a “sand-dominated” fabric. Undrained monotonic triaxial tests were carried out on Ticino sand-silt mixtures (FC = 0–30%) for a wide range of initial void ratios and mean effective confining stresses. The study provides evidence that, when the (global) void ratio is used as the comparison basis, the effect of fines is to cause an increase in the degree of contractiveness and higher susceptibility to collapse. Nevertheless, when the comparison is made at constant equivalent granular void ratio, undrained shear behavior and collapsibility of the silty sands are closely related to e*, which appears an effective index for unifying the response of mixed soils with varying fines content.