Geotechnical study in Fornells de la Selva

In Fornells de la Selva, the geotechnical subsoil is composed mostly of sandstones, conglomerates and flysch, accounting for close to 70% of the soils, while compacted gravels and sands are also significant. These formations are usually classified as competent materials, with good bearing capacity for shallow or semi-deep foundations depending on the project requirements. In addition, the generally low permeability helps to promote stability against the risk of differential settlement, although local superficial aquifers may exist and should be considered in the geotechnical study phase to prevent moisture-related or washout problems.

Seismic activity in the area is very low, given the record of just 2 events over 30 years and a maximum magnitude of 1.6, so it does not represent a significant concern in the structural design of the building. Since the subsoil is not clayey, the possibility of expansiveness that could affect the stability of the foundations is ruled out. In conclusion, the main focus should be on the proper characterisation of the load-bearing layers and, to a lesser extent, on the possible presence of superficial aquifers associated with the lithologies present.