Geotechnical study in Valverde del Majano

In Valverde del Majano, soils of compact gravel and sand predominate, representing a favourable foundation base for direct footings thanks to their high bearing capacity. However, areas are identified where there is occasional presence of white/soft expansive clays and materials of calcareous nature and sandstones, which requires a detailed analysis of the site to avoid bearing on unstable or low-strength sectors. The risk of expansivity is associated with clays distributed in a dispersed manner, which calls for special attention to prevent differential settlement and ensure long-term structural stability.

Seismicity in the municipality must be considered carefully in geotechnical and structural design, as approximately 200 seismic events have been documented over 30 years, with an estimated maximum magnitude of 4.7. In addition, the presence of calcareous and dolomitic formations implies a high risk of karstification, making it essential to verify this before carrying out any type of foundation. The main constraint for construction in Valverde del Majano is the combination of significant seismic risk and the possible presence of karstified cavities—elements that determine the type and depth of the foundation.