Slope Stability Problems Related to a Semi-Bridge Construction

In the area of AKTEA , a summer-housing estate 36 Km away from the city of Athens, a great landslide affected the stability of a semi-bridge, constructed in 1980 for the widening of the nearby national road. Preliminary studies carried out before the semi-bridge construction and after the observed damage of most of the houses in the uphill area, favoured the existence of a very superficial creep affecting however the one or two storey buildings of the summer-housing estate. After the semi-bridge construction, instability phenomena continued in an increasing rate and a more systematic geotechnical investigation revealed definite landslide movements (instead of a superficial creep) in a depth 2.5 to 4.0 metres below the foundation level of the piers of the semi-bridge and in a depth 6-8 m below the road level. This paper describes details of the above landslide, the investigations carried out and the remedial measures suggested