Estudio geotécnico in Lasarte-Oria

In Lasarte-Oria, ground conditions are predominantly formed by sandstones, conglomerates and flysch, which constitute the most usual geological basis for foundations, although there are also significant areas of limestones, dolomites and marbles. These lithologies typically offer good or acceptable bearing capacity, facilitating direct foundation projects, except for localised cases of fine sands and silts where a specific analysis may be required for capacity reduction or liquefaction risk. Given the low permeability of most of these formations, the presence of shallow groundwater remains localised and does not usually substantially compromise foundation stability.

Seismic activity in the municipality is high, with 200 recorded events over 30 years and an Mmax value of 4.5, which makes it essential to take seismic actions into account in structural design and calculation. There are no issues associated with karst processes and no elevated risk of expansive soils, since expansion is limited to the presence of some minor, dispersed clay level that is not dominant. The main geotechnical constraint in Lasarte-Oria, therefore, is seismicity; accordingly, projects must be adapted to the current technical regulations in this area to ensure the safety and durability of buildings.