Geotechnical study in Sitges

In Sitges, the substrates formed by limestones, dolomites and marbles predominate, which represent the most habitual foundation for construction projects in the area. These stony materials provide a high bearing capacity and, in most cases, allow direct foundation; however, in specific sectors, overconsolidated clays and marls may be present, although their occurrence is secondary. The moderate permeability of these soils promotes drainage, which is advantageous for the stability of the foundation.

Seismic activity in Sitges is significant, with 129 recorded events over 30 years, although of low magnitude (Mmax 2.3), which implies the need for a specific seismicity analysis as part of the geotechnical study, but without extraordinary design requirements. It should be noted that karstification is present in the subsurface; before proceeding with any foundation, the existence of cavities or instabilities associated with karst must be verified, since this factor can significantly affect the safety of the project. The non-clayey substrate rules out any problems related to expansiveness, with karst being the most relevant local factor.