Geotechnical study in Lumbrales

In Lumbrales, the dominant substrate is composed mainly of slates and schists, with a significant presence of granite, gneiss and other igneous rocks, as well as some bands of sandstone and conglomerates. These materials provide good bearing capacity for shallow foundations, with standard requirements typically relating to dimensions and depth. The low incidence of gravel and compact sands limits the presence of loose soils, and the water mass is not significant. Given the low permeability of these ground conditions, shallow aquifers may develop, although they do not usually entail major problems for construction except at very localised points.

Seismic activity in Lumbrales is very low, with only about three events in 30 years and an Mmax of 2.4, so it does not represent a conditioning factor for structural design. The absence of karst and the non-clayey nature of the substrate remove concerns regarding possible differential settlement due to dissolution or soil swelling. In conclusion, the main geotechnical constraint in the area is the need to correctly identify the type of rock and its degree of weathering, which will influence excavability and the selection of the optimal foundation.