Geotechnical study in Osorno la Mayor

In Osorno la Mayor, the subsoil is mainly dominated by compacted gravels and sands, which provides a suitable material for direct foundations. These soils have a high bearing capacity and facilitate the drainage of water, favouring both the stability and the drainage of the foundations. Additionally, the significant presence of consolidated sandstones, conglomerates and flysch is beneficial for bearing capacity; the local areas of fine sands and silts exhibit lower strength and require specific attention in the design. The abundance of extensive, high-permeability aquifers promotes water availability, although it may affect the water table in deep excavations.

Seismic activity in the municipality is notable, with 57 registered events in the last 30 years and a maximum magnitude of 4, so it is advisable to take these parameters into account in structural sizing. The expansiveness associated with clays appears only in a subordinate manner and generally in areas with more humid climatic conditions, minimising the overall risk of swelling. The absence of karst and of saline or gypsum-bearing soils reduces other common geotechnical risks, with lithological variability being the factor that may require the most characterisation in each plot.