Geotechnical study in Burguillos

In Burguillos, the dominant substrate is fundamentally composed of granite, gneiss and other igneous rocks, which account for more than half of the ground and provide excellent bearing capacity. These materials allow conventional shallow strip and footings, provided they are found at a depth suitable for the works. The presence of limestones, dolomites and marbles likewise provides good geotechnical characteristics, although it is important to monitor any localised occurrence of sands, silts and gravels whose stability must be assessed case by case to avoid differential settlements. Loose materials make up a small percentage and, in general, may be suitable as fill or, on occasions, require improvements to provide functional support.

Seismicity in Burguillos is very low, with only one recorded event in the last 30 years and a low magnitude (Mmax 1.7), so it does not represent a relevant constraint for structural design. The expansivity analysis indicates that the substrate is not clayey, ruling out risks associated with expansive soils. In addition, no karstic phenomena are detected in the area, so ground stability is fundamentally determined by the dominant rock nature. Overall, the main constraint in Burguillos is the proper characterisation of the thickness and continuity of the hard materials in order to ensure safe and efficient foundations.