Geotechnical study in Valdetorres

In Valdetorres, water masses predominate, as well as deposits of compact gravel and sand, which present good conditions for the bearing capacity of shallow foundations provided their compaction is adequate. To a lesser extent, sandstone, conglomerates and flysch are found, as well as some igneous rocks such as granite and gneiss, which can provide excellent support for deep or direct foundations. The occasional presence of fine sands, silts and overconsolidated clays indicates that the local conditions of strength and consolidation must be assessed, although these hard clays generally do not pose a significant problem if they do not form the main supporting level.

Seismicity in this municipality is considered notable, with 52 events recorded up to a magnitude of 4.4 over the last 30 years; although the maximum magnitude does not reach the critical threshold of 4.5, it is necessary to review the dynamic behaviour of the soils to ensure structural integrity in the design, especially for new buildings. The non-clayey substrate rules out the risk of expansiveness, allowing conventional foundation approaches. Thus, the main geotechnical consideration in Valdetorres is the typology and compactness of the granular levels, together with the local assessment of any less competent layers, such as fine sands or silts.