Geotechnical study in Bermillo de Sayago

In Bermillo de Sayago, granite, gneiss and other igneous rocks predominate as the substrate, occurring in more than 89% of the municipal area, which provides generally resistant and stable ground. Compacted gravels and sands are found in small proportions, but their presence is residual compared with this. This type of soil favours high bearing capacities and allows the design of superficial or semi-deep direct foundations, without significant problems arising from compressibility or the heterogeneity typical of other ground types.

With regard to seismicity, 200 events have been recorded in the last 30 years with a maximum magnitude (Mmax) of 4.5, which implies high seismic activity and requires that the structural calculation and design appropriately take into account the requirements of the Building Code for these scenarios. There is no risk of karst or of expansiveness, as the dominant substrate is non-clayey. The main geotechnical constraint in Bermillo de Sayago is the need to take into account seismic action in any building project.