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Regarding initial plastic deformations, the behavior of undrained-fine soils is commonly overseen in engineering practice since settlement analysis tends to focus on initial elastic deformations, as well as the ones occurring due to time dependency. The use of a proper foundation type heavily influences the induced geo mechanical response in the soil, from which undesirable outcomes could arise. The presented forensic geotechnical engineering evaluation exhibits a relatively thick layer of a saturated and fine-highly plastic material which is located at a shallow location. Significant settlements were measured on field regarding a set of 4-tank reservoirs, which exerted large overburden pressures due to their imposed design loads, as well as their dimensions. A numerical analysis (Finite Element Method or FEM) was carried on for analyzing the mechanical behavior of the given geotechnical site conditions under imposed structural loads. The numerical inputs (parameters) were enhanced by means of calibrations obtained from measured in situ measurements. A particular emphasis is taken for the effects of the constructed shallow foundation type (concrete ring+fill material), such as mitigating the induced settlements within the analyzed site. The existence of significant stresses is taken into account at locations in which the tanks are close to each other (overlapping bulb stresses).
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