Geotechnical study in Trasmiras

In Trasmiras, sandstone, conglomerates and flysch predominate as the substrate, accompanied in smaller proportions by slates, schists, as well as by clays and hard marls. These materials generally exhibit good mechanical behaviour, offering medium to high bearing capacities, which facilitates the design of shallow foundations for light and medium-sized buildings. However, the occasional presence of deltaic muds and peats requires precise location to prevent their use as a bearing stratum, as they may compromise the stability of the foundation.

Seismic activity in Trasmiras is moderate, with a record of 11 events over thirty years, but the low maximum magnitude (Mmax 2.8) implies a reduced seismic risk for structural design. Since the substrate is mostly non-clayey, the risk of expansivity is ruled out, which constitutes a significant advantage in the development of projects. The main geotechnical constraint in the area is the identification and avoidance of soft layers of mud or peat, ensuring a safe foundation on the predominant competent materials.