Geotechnical study in Aretxabaleta

In Aretxabaleta, the predominant subsoil is composed of limestones, dolomites and marbles, accompanied in a lower proportion by sandstones, conglomerates and flysch. This combination of materials generally provides an adequate bearing capacity, although the predominantly carbonated rocks require particular attention to the possible existence of cavities or dissolution. For foundation projects, direct solutions are usually chosen when the materials are compact, avoiding placing supports on altered or fractured levels.

Seismic activity in the municipality is very low, with only one recorded event in 30 years and a low maximum magnitude, so it does not represent a relevant factor in structural design. However, the likelihood of karst development across the set of calcareous massifs makes it essential to verify its presence through tests and studies prior to any foundation phase, as it is the most important technical constraint in the area. On the other hand, the non-clayey subsoil makes it possible to rule out risks of expansiveness in the supporting ground.