Estudio geotécnico in Zarza la Mayor

In Zarza la Mayor, soils formed by slates and schists predominate; these metamorphic materials generally exhibit a competent bearing capacity and good conditions for shallow foundations, unless there are altered or highly fractured zones. The low proportion of granitic soils and the occasional presence of fine sands and silts do not usually compromise the foundation solutions, although special care should be taken in areas close to bodies of water, where the groundwater table could rise and, as a result, reduce the local bearing capacity. In general terms, the low permeability of these materials promotes ground stability, allowing direct foundations to be designed after the appropriate verification of the specific mechanical characteristics in the field.

Seismic activity in this area is notable, with 56 events recorded over the last 30 years, although the maximum magnitude (Mmax 3.1) is considered low; therefore, seismicity does not constitute a relevant risk factor in structural design. The non-clayey substratum rules out the problem of expansivity, facilitating the predictability of the ground’s mechanical behaviour. In conclusion, the main geotechnical limiting factor in the municipality lies in local heterogeneity associated with altered zones or the proximity of water-bearing surfaces, which require detailed characterisation to ensure foundation safety.