Geotechnical study in Figueres

In Figueres, the predominant stratum consists of fine sands and silts, which exhibit medium to low bearing capacity and require special attention in the design of shallow foundations, especially in the presence of soft layers. The secondary levels include sandstones, conglomerates, flysch and carbonate formations such as limestones, dolomites and marbles, which in specific cases may provide better conditions for founding, given their more favourable mechanical properties. The occasional presence of gravels and compact sands may facilitate direct foundation solutions at specific points, although the generally low permeability may condition the management of groundwater.

The seismic record in Figueres is moderate, with 17 events in the last 30 years and a maximum magnitude Mmax=2.4, so the seismic influence on structural design is usually limited. Nevertheless, it is worth highlighting the existence of karst phenomena associated with the carbonate formations, which must be carefully assessed before carrying out any foundation work to avoid risks arising from voids or subsidence. The non-clayey substratum removes concerns about expansiveness-related problems, with the main limiting factor in the geotechnical study being the detailed verification of possible karst processes in the area where the structure is to be built.