Publication: Deslizamientos en los materiales del Triásico inferior de Ferreríes (Menorca)
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2008
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Sociedad Geológica de España.
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Abstract
Una de las laderas, a cuyo pie se asienta la EDAR de Ferreríes, en la Isla de Menorca, está afectada por un deslizamiento planar que involucra un volumen de roca de unos 50.000 m3 El plano de deslizamiento se localiza en el contacto estratigráfico entre dos tipos de materiales del Triásico inferior, los cuales presentan diferente comportamiento hidrogeológico: unos materiales permeables - constituidos por bancos de areniscas silíceas muy fracturados-, y niveles de lutitas verdes y rojas, que constituyen materiales de muy baja permeabilidad. El movimiento extensivo a través de este plano genera una grieta casi vertical en el terreno con aperturas de hasta 15 m en cabecera. En el caso de descalzarse la ladera por el deslizamiento actual, podrían entrar en juego planos de rotura de mayores dimensiones, que se intuyen ya en la geomorfología de la ladera, poniendo en peligro la seguridad del conjunto de la EDAR y de las viviendas situadas al pie de la misma.
The Water Treatement Plant of Ferreríes (Minorca) is located at the foot of one of the slopes affected by a planar landslide, which involves a volume of rock of 50,000 m3. The slide plane is at the contact between two types of Lower Triassic materials, with different hydrogeological behaviour: a permeable one- constituted by layers of intensively fractured silica sandstone-, and layers of red and green lutites, which form material with very low permeability. The extensive movement along this plane causes an almost vertical crack in the ground, measuring up to 15 m at its highest point. If this lower supporting material were removed by the current slide, greater breaking planes could come into play, endangering the Plant and dwellings located at its foot.
The Water Treatement Plant of Ferreríes (Minorca) is located at the foot of one of the slopes affected by a planar landslide, which involves a volume of rock of 50,000 m3. The slide plane is at the contact between two types of Lower Triassic materials, with different hydrogeological behaviour: a permeable one- constituted by layers of intensively fractured silica sandstone-, and layers of red and green lutites, which form material with very low permeability. The extensive movement along this plane causes an almost vertical crack in the ground, measuring up to 15 m at its highest point. If this lower supporting material were removed by the current slide, greater breaking planes could come into play, endangering the Plant and dwellings located at its foot.