Geotechnical study in Aroche

In Aroche, soils formed by slate and schist predominate, representing more than 70% of the substrate, which provides a generally competent and stable foundation for buildings. These materials, although of low permeability, offer good bearing capacity, but may require deep foundations if surface alterations or weathered zones are detected. The occasional presence of granite, gneiss and other igneous rocks also contributes significantly to the overall stability of the ground, reinforcing options for direct or semi-deep foundations in most cases.

Seismic activity in the municipality is very low, with just 4 events over 30 years and a maximum magnitude of 4.2, which indicates that the seismic hazard is low and therefore does not constitute a priority constraint in structural design. Likewise, the non-clayey substrate rules out expansivity-related problems, making it easier to plan standard foundations without additional measures for that reason. In conclusion, the geotechnical characteristics of Aroche allow for conventional designs except in specific areas where weathering could reduce the strength of the near-surface materials.