Estudio geotécnico in Viana do Bolo

Granites, gneisses and other igneous rocks predominate in Viana do Bolo, accompanied by slates and schists in smaller proportions. These materials form a competent subsoil, with good bearing capacity and low deformability, suitable for shallow direct foundations in most cases. Water bodies are very scarce and, as a rule, do not condition the foundation solutions, except in special cases close to reservoirs or watercourses.

Seismic activity in Viana do Bolo is moderate, with 43 recorded events over the last 30 years and a low maximum magnitude of 3.1, without significant impact on the usual structural design. The non-clayey substrate rules out the presence of expansive soils, so there is also no notable risk of expansivity. The main geotechnical constraint lies in the adequate characterisation of the fracturing of the rock mass in order to optimise the foundation solutions.