Estudio geotécnico in Liérganes

In Liérganes, the dominant subsoil consists of sandstones, conglomerates and flysch, accompanied by significant proportions of limestones, dolomites and marbles. These materials generally exhibit good bearing capacity, providing suitable conditions for shallow foundations. However, the minor presence of gypsum, anhydrite and salts introduces a possible risk of dissolution in certain locations, which should be assessed especially in areas with groundwater flow. Fine sands and silts, although uncommon, may be found in some areas, but their limited development usually does not compromise the overall stability of the foundations.

The municipality’s seismicity is very low, with only two recorded events in the last 30 years and a low maximum magnitude, which limits the influence of this factor in structural calculations. As the area is characterised by the presence of limestones and dolomites, karst activity is a critical aspect that must be specifically verified before carrying out any foundation work, as it may entail the existence of voids or localised subsidence. In addition, the non-argillaceous subsoil rules out concern regarding expansivity. In this way, the verification and characterisation of the karst become the dominant constraint for geotechnical study in Liérganes.