Geotechnical study in Carboneras

In Carboneras, the substrate is dominated by shales and schists, accompanied by fine sands, silts, and a moderate presence of limestones, dolomites and marbles. These materials provide good overall bearing capacity, without the issues associated with soft soils or low competence. Sandstone and conglomerate levels are usually localised and do not constitute a broadly significant constraint; however, the occasional occurrence of gypsum, anhydrite and salts introduces the risk of dissolution processes, which may affect the stability of foundations in specific areas, and therefore requires particular attention during the geotechnical investigation phase. The presence of local aquifers with moderate permeabilities and yields should also be taken into account in order to avoid hydraulic interference during the development of the works.

Seismic activity in Carboneras is moderate, with 18 events recorded over thirty years, although the maximum magnitude does not exceed 2.8, which places seismic risk at levels that are not particularly concerning for structural design. The analysis of expansiveness indicates the absence of risk related to expansive clays, since the predominant substrate is not clayey. As a conclusion, the main geotechnical constraint in the municipality stems from the possible presence of gypsiferous levels and soluble salts, which can induce dissolution-related subsidence; the assessment of these strata should be a priority in the geotechnical study of any project in the area.