Geotechnical study in Vega de Espinareda

In Vega de Espinareda, the dominant geotechnical substrate consists of slates and schists, materials characterised by low permeability and a variable bearing capacity depending on the degree of weathering. The secondary presence of sandstones, conglomerates and flysch adds local heterogeneity to the ground, while areas with deltaic muds and peats, although infrequent, should be avoided as a foundation level due to their low strength and high compressibility. These conditions require accurate assessment in order to select the most appropriate type of foundation, and it is recommended to found on the rocky or partially altered levels to ensure stability and durability.

The municipality’s seismicity is classified as high, with 200 events recorded over 30 years, although the maximum magnitude observed (Mmax 3) is relatively low, so the effects on structural design are usually limited. The area lacks expansive clay materials and any risk of karstification, which simplifies the analysis of problems related to chemical aggressiveness or differential movements due to swelling. The main geotechnical constraint in Vega de Espinareda lies in lithological variability and the accurate identification of unsuitable areas for founding, such as the muds and peats, which require specific assessments before proceeding with construction.