Geotechnical study in Llinars del Vallès

In Llinars del Vallès, the predominant composition of the subsoil corresponds to granite, gneiss and other igneous rocks, providing great stability and high bearing capacity for shallow foundations. The geotechnical profile is complemented by compact gravels and sands, suitable for most construction uses provided adequate compaction levels are ensured. As a secondary feature, formations of sandstone and conglomerates may occur; their mechanical behaviour is also favourable for the design of foundations, although the local presence of any potentially friable or altered layers should be verified.

Seismicity in the area is very low, with only around 2 recorded events over 30 years and a maximum magnitude of 2.8, so the seismic influence on structural design is practically non-existent. There is no karst risk or problems associated with expansive soils, since the substratum is not clayey. This makes it possible to focus the geotechnical study on the local heterogeneity of the materials: the possible presence of altered layers within the granitic formations or the location of shallow aquifers are the main factors to assess before defining the most suitable foundation solution.