Geotechnical study in Cañiza, A

In the municipality of A Cañiza, the dominant substrate is mainly composed of granite and gneiss, as well as other igneous rocks, accounting for more than 95% of the soils. These materials provide a very competent foundation for footings, standing out for their high bearing capacity and long-term stability. Compacted gravels and sands, although less frequent, may occur locally and also offer good conditions for direct support, provided that their state of compaction is verified.

Seismic activity in A Cañiza is moderate, with 47 events over three decades and a maximum magnitude of 2.9, which implies a low risk for structural design. No hazards associated with karst or expansivity processes are detected, as the non-clayey substrate rules out this type of problem. The most relevant geotechnical constraint in the area is the presence of formations that are generally impermeable; this may affect groundwater management, although it does not pose significant restrictions for most conventional buildings.