Estudio geotécnico in Andorra

In Andorra, the predominant presence of gypsum, anhydrite and salts implies specific conditions for the ground’s bearing capacity, because these materials may show risks of dissolution under certain hydrological conditions. Limestones, dolomites and marbles, although less frequent, introduce the possibility of karstic formations, while compact gravel and sand provide good bearing performance, making them suitable for shallow foundations provided they are located within the supporting stratum. The highly permeable characteristics of the municipality’s aquifers require particular attention in the design to avoid unforeseen issues associated with the groundwater table during the rainy season.

The seismicity in Andorra is classified as notable because 93 events have been recorded over 30 years, although with a reduced maximum magnitude (Mmax) of 2.2, so its structural impact is limited. It is nevertheless important to verify karst development in advance before carrying out any foundation, given the potential presence of voids and sinkholes. The local bedrock is non-clayey, ruling out risks associated with expansivity. The main geotechnical constraint in the area is the existence of gypsum and karstic formations, which require a detailed study to ensure reliable and durable foundation solutions.