Geotechnical study in Trescasas

In Trescasas, a substratum predominantly composed of slate and schist prevails, representing 92,43% of the soils, accompanied occasionally by granite, gneiss and other igneous rocks. These materials generally provide an adequate bearing capacity for shallow foundations, although special attention is required due to the low permeability of these soils, as this could affect the discharge of water and favour surface accumulations. Shallow foundations are usually suitable, but the occasional presence of shallow aquifers means that the hydrogeological conditions must be studied in detail at each site.

Seismicity in Trescasas is high, with more than 200 registered events over a period of 30 years and a maximum magnitude of 4,7, so the structural design must incorporate criteria for seismic response adapted to this environment. The absence of clayey materials rules out expansivity-related risks, while karst does not constitute an influencing factor present here. In conclusion, the main conditioning factor for the geotechnical study in Trescasas is the high seismicity, which must be taken into account as a priority alongside the thorough characterisation of local permeability.