Estudio geotécnico in Galdakao

In Galdakao, the substrates are predominantly composed of sandstones, conglomerates and flysch, accounting for almost half of the outcropping materials, together with a significant presence of limestones, dolomites and marbles. Levels of fine sands and silts are also common, although in smaller proportions. This lithological diversity generally implies a good bearing capacity for conventional foundations, provided that the sectors with finer or saturated materials are avoided—typical of areas close to masses of water—which may show variability in compaction and therefore must be assessed in detail before designing shallow strip or direct foundations.

Seismicity in this municipality is notable, with a record of 94 events over the last 30 years and magnitudes reaching up to Mmax 3.7, so it must be specifically considered in structural projects. The non-clayey bedrock rules out the risk of expansivity, and the absence of karst prevents problems associated with cavities or subsidence. Therefore, the main geotechnical constraint in Galdakao lies in lithological heterogeneity and the need to assess local permeability, particularly in the presence of fine materials or shallow aquifers.