Estudio geotécnico in San Andrés del Rabanedo

In the municipality of San Andrés del Rabanedo, consolidated formations predominate, such as sandstones, conglomerates and flysch, which account for close to half of the near-surface substrate. These lithologies, together with the frequent occurrence of compact gravels and sands, define a ground that is generally suitable, with good bearing capacities for shallow or semi-deep foundations. The occasional presence of fine sands and silts suggests localised zones with lower bearing capacity and, along with the high permeability of the aquifers, possible piezometric drawdown or uplift under the foundation design should be taken into account.

From a seismic standpoint, San Andrés del Rabanedo shows activity considered to be high, with approximately 200 events over the last 30 years and a maximum magnitude of 4.7. This makes it essential to incorporate earthquake-resistant criteria in structural design, for both buildings and infrastructure. Although expansive clays occur in a subordinate manner, their impact is limited by their limited development and the lack of climatic conditions that would enhance their activity; therefore, the main constraint for the geotechnical study in this municipality is the seismic hazard, with priority given to its analysis at the project stage.