Estudio geotécnico in La Roca del Vallès

In La Roca del Vallès, soils derived from granite, gneiss and other igneous rocks predominate, which constitute approximately 75% of the substrate. These materials exhibit high mechanical competence and provide excellent bearing capacity, facilitating the construction of shallow direct foundations. In turn, compact gravels and sands appear occasionally and also offer suitable support due to their density, although they may require checks of density and homogeneity. Sedimentary formations, such as sandstones and conglomerates, are less frequent in the area and usually show good stability, allowing flexibility in foundation solutions.

The seismic activity recorded in the locality is very low, with only 3 events in 30 years and a maximum magnitude of 2.7, so seismic risk does not represent a relevant constraint for structural design. In addition, the area is characterised by a non-clayey substrate, ruling out the possibility of problems associated with expansive clays. There are also no karst processes that could compromise foundation stability. Thus, the main factor to consider in local geotechnical studies is the appropriate characterisation of the compaction and continuity of the rock mass or of granular materials, given their predominance and importance for safe foundation design.