Estudio geotécnico in Naut Aran

In the municipality of Naut Aran, soils formed by limestones, dolomites and marbles predominate, followed by granite, gneiss and other igneous rocks. These are high-strength materials, with generally high bearing capacity that facilitates the selection of shallow foundations, provided there are no abrupt reliefs that condition the support levels. Slates, schists and sandstones that are occasionally present may modify behaviour locally, but they do not alter the predominance of a competent and low-deformability substrate. The low overall permeability of the ground results in a limited presence of aquifers; however, there may be surface waters associated with less compacted zones, which recommends carrying out a site-specific analysis of the site hydrogeology.

Seismicity in Naut Aran is high, with more than 150 events over 30 years, although the maximum magnitude of the recorded ground movements (Mmax 3.8) remains below the usual threshold for structural design. The development of karstification in the calcareous formations implies the need to carry out a thorough verification of cavities, water conduits or subsidence before executing the foundation, as these processes can significantly affect both the stability and the durability of the works. The absence of an clayey substrate practically rules out the risk of swelling-related phenomena. As the main constraint for any geotechnical study in Naut Aran, the need to assess possible karst structures and the structural characteristics of the rock mass stands out.