Geotechnical study in Ugena

In Ugena, the dominant geological substrate is formed by sandstones, conglomerates and flysch, which habitually implies a good bearing capacity for the direct shallow foundation of buildings, provided that no softer interbedded layers or altered zones are identified. Limestones, dolomites and marbles are present on an occasional basis, and their presence can further increase the ground strength, although the continuity of these materials must be assessed. Compact gravel and sand, although less frequent, also provide a suitable foundation for shallow foundations provided they are properly consolidated. The moderate permeability of the aquifers makes it necessary to carry out hydrogeological checks, particularly if excavation approaches the water table.

Seismicity in Ugena is high, with 200 events in the last 30 years and a maximum value of seismic acceleration corresponding to a magnitude 5.1 event; this means that specific seismic measures must be considered in the structural design of the works. No karst risk is identified, but it is relevant to note the possible subordinate presence of expansive clays, although located in areas where the climate mitigates the usual expansive effects; nonetheless, their presence must be verified locally within the project area. Overall, the main constraint for the geotechnical study in Ugena is the high seismicity, which requires special attention both in prior investigations and in the structural calculation stage and in the definition of the foundation.