Estudio geotécnico in Alonsotegi

In Alonsotegi, the dominant geological substrate is formed mainly by limestones, dolomites and marbles, representing more than 75% of the ground. These materials provide an excellent bearing capacity for buildings, provided that their internal structure is solid and without significant voids. Sandstones, conglomerates and flysch appear occasionally, contributing some heterogeneity to the ground, although in smaller proportions. It is important to assess the compactness and the degree of alteration of these strata in order to define the most suitable foundation type, although the predominant formations usually allow for shallow or semi-deep foundations.

As for geotechnical risks, expansivity is not a concern in Alonsotegi, since the substrate is not clayey. Seismicity is notable, with 94 recorded events over 30 years, although the maximum magnitude remains within moderate values (Mmax 3.7). Therefore, the main geotechnical constraint lies in verifying the continuity and quality of the limestones and dolomites, taking into account some lateral heterogeneity due to the presence of flysch. The absence of karstification phenomena and the low expansivity risk simplify the assessment for a geotechnical study in the area.