Geotechnical study in Toreno

In Toreno, sedimentary strata predominate, composed of muds and peats of deltaic origin, sandstones, conglomerates, flysch, as well as shales and schists, all of which are frequently present. Since muds and peats are soft, highly compressible materials, they are not recommended as bearing levels due to their low bearing capacities and high potential for differential settlement. The formations of sandstones and conglomerates, together with the shales and schists, provide better conditions for foundation design, although detailed investigation is needed to identify localised areas of organic soils and soft materials that could compromise stability.

Seismic activity in this municipality is notable, with 98 recorded events over the last 30 years and a maximum magnitude of 3.5; although the magnitude is not high, the frequency must be taken into account during the geotechnical assessment. The non-clayey subsoil removes concern about expansivity, focusing attention on lithological heterogeneity and the presence of organic materials. The main geotechnical constraint in Toreno is the need to avoid muds and peats as a foundation level and to carefully assess the variability of the natural subsoil before any construction intervention.