Estudio geotécnico in Onil

In Onil, the ground is dominated by the presence of sandstones, conglomerates and flysch, together with a significant proportion of limestones, dolomites and marbles. These materials generally provide favourable bearing capacity for shallow foundations, although the presence of fine sands and silts requires detailed characterisation to avoid differential settlement. The predominant strata exhibit low permeability, although the existence of restricted shallow aquifers associated with certain formations is possible, which makes it necessary to pay attention in civil engineering and building projects to the management of groundwater.

Seismic activity in the area is moderate, with 12 recorded events over the last 30 years and a maximum magnitude of 3, which implies low seismicity that does not significantly condition structural design. It is, however, essential to verify the potential presence of karstic cavities in the limestones and dolomites before founding, as these may affect the stability of buildings. Since the substrate is not clayey, the risk of expansivity is ruled out. The main geotechnical constraint in Onil is linked to the possible development of karstic processes and the location of low-compacity zones associated with fine soils.