Estudio geotécnico in Valderrobres

In Valderrobres, soils consisting mainly of sandstones, conglomerates and flysch predominate, providing a competent and stable substrate for most construction projects. The secondary presence of limestones, dolomites and marbles introduces the possibility of areas with greater stiffness, although their frequency is much lower. The layers of fine sands and silts, being rare, require a case-by-case assessment to avoid potentially unstable layers; however, overall, the high permeability of the area and extensive aquifers facilitate good drainage and enhance the reliability of the soil’s bearing capacity. This translates into direct foundation options for most buildings, provided that bearing is avoided on zones of low consistency.

Seismicity in Valderrobres is very low, with just 6 events over the last 30 years and a maximum magnitude of 3.1, so it does not constitute a significant design constraint for structural design. However, the existence of carbonate formations such as limestones and dolomites makes it necessary to verify the presence of karstic phenomena before undertaking foundations, given the possibility of cavities or deep dissolution that could compromise safety. As the deposits are founded on non-clayey substrates, risks of expansivity are ruled out, so the main technical aspect to examine is the presence and potential influence of karst on the supporting ground.