Geotechnical study in Sallent de Gállego

In Sallent de Gállego, strata of slates and schists predominate, together with notable occurrences of limestones, dolomites and marbles. These lithologies, known for their compactness and strength, provide a good bearing capacity for building foundations, reducing the risk of uneven settlement. Granite, gneiss and igneous rocks, although less common, also contribute favourably as a substrate, while compact gravels and sands offer specific options for support. Hard clays and marls, being overconsolidated, exhibit low compressibility, so they can be considered safe for support provided that their thickness and continuity are verified.

In terms of geotechnical risks, seismicity is considered notable, with 70 events over 30 years, although with a maximum recorded magnitude of 2,9, which implies a low potential for significant accelerations. It is essential to highlight the existence of karst processes associated with limestone and dolomitic formations: before carrying out any foundation work, it is imperative to rule out the presence of cavities or underground dissolution that could compromise stability. The absence of an underlying clayey stratum also rules out the risk of expansivity, positioning the verification of karst phenomena as the most conditioning aspect in the local geotechnical study.