Predictive map of clay expansivity risks in Spain at a scale of 1:1,000,000
The Predictive Map of Expansivity Risks of Spanish Clays at a scale of 1:1,000. 000 delimits the clay formations, classifying them into 4 grades according to their expansivity potential: Non-expansive clays or clays dispersed in a non-clay matrix: No or low risk of expansivity; Subordinate expansive clays or clays located in climatic zones without an annual humidity deficit: Low to moderate expansivity risk; Locally predominant expansive clays located in climatic zones with annual moisture deficit: Moderate to high expansivity risk; Predominant expansive clays in areas where expansivity problems have occurred. High to very high expansivity risk. The term expansivity defines the capacity of the soil to undergo volume changes when its moisture conditions are modified, or to generate pressures if expansion is prevented. This map was made by the Geological Survey of Spain (IGME) with the collaboration of the Centro de Estudios y Experimentación de Obras Públicas (CEDEX) in 1986.
The construction problems derived from the expansiveness of clay soils can be significant and directly affect the integrity of buildings and certain infrastructures. Spain, due to its climatic conditions and geological characteristics, is a country where this type of phenomenon constitutes a real threat. The 1:1,000,000 scale Predictive Map of Expansive Clay Hazards in Spain, in addition to constituting an inventory of spatial distribution, has been drawn up as a first-order reference for territorial planning at national and regional level in terms of geological/geotechnical risks, providing an effective approximation for more detailed studies.
Establishment of territorial spheres with related characteristics (geological, morphological and climatic). Definition and classification of chronolithological units and linkage to climate. Sectorial review and evaluation of expansivity and ascription to the different chronolithological units. Assessment of potential expansivity. Establishment of the expansive potential of the soil and classification. Plotting of units on the map at a scale of 1:1,000,000.
Equivalent Scale:
1:
1000000
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