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INSTABILITY CHARACTERIZATION OF THE GEOLOGICAL FORMATION "AREIAS E ARGILAS DE TAVEIRO" IN THE CONDEIXA AND COIMBRA AREAS (CENTRAL-WESTERN PORTUGAL)
Abstract
The work aims to characterize the slope instabilities present in the Taveiro Sand and Clay - Areias e Argilas de Taveiro - Formation, which occurs in the municipalities of Condeixa and Coimbra, in central-western Portugal. The Areias e Argilas de Taveiro Formation, of Upper Cretaceous - Campanian - age, is made up of successions of metric layers of red, and brownish or pinkish pelites, interbedded with coarse arkosic sandstones. It has as maximum thickness of about 170 m. A total of 27 slopes with stability problems were counted in both municipalities, 16 in Coimbra and 11 in Condeixa. Several information was collected, as morphometrics, the lithological type, the existence of vegetation, the presence of erosive processes, the probable age of occurrence and the type of instability movement. The characterized slopes correspond entirely to excavation slopes. They vary in length from 18 to 180 meters, in height from 1.5 to 7 meters, and in dip from 31- to near vertical. The type of instability found corresponds mainly to shallow landslides (48.4%), and with a significant number of rotational landslides (29.0%) and earth flows (12.9%). Regarding the possible consequences of instability, most of the situations related to instability movements can reach roads with permanent traffic (81.5% of the slopes).
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