Estudio geotécnico in Sant Andreu de Llavaneres

In Sant Andreu de Llavaneres, the dominant subsoil is composed mainly of granite and gneiss, with occasional appearances of other igneous rocks. This stony composition provides a foundation with excellent bearing capacity, allowing direct foundations in most cases. On the other hand, locally there are compact gravels and sands, materials that also offer good conditions for support, although they require verification of their natural compaction. Occasional levels of fine sands and silts call for specific attention in order to determine their stability and avoid differential settlement.

Seismicity in the municipality is very low, with only 2 recorded events over 30 years and a maximum magnitude of 1.7, which implies a low seismic risk in structural design. As no clays are found and there is no significant presence of expansive materials, the risk of expansivity is ruled out for foundations. The main constraint to consider is ensuring the adequate characterisation of the strength of the igneous rock masses and analysing permeability in areas where shallow aquifers may exist.