In the 1995, after about 30 years of inactivity, began in Venice the excavation of the canals. The excavation of the internal canals was always a problem for the city; in fact it was necessary to guarantee the navigability and to perform the maintenance of the walls of the canals. With the motor navigation the problem was subsequently widened, when the deterioration of the buildings, for effect of the wave motion, was revealed as an aspect of primary importance for the safeguard of the walls, so that the radical maintenance of the walls have become the principal activity during the restoration works. In particular, the so called "Progetto integrato rii", that interests about 90 km of walls, provides the excavation of the mud, the restoration works of the walls and of the foundations of the buildings facing the canals, the consolidation of the bridges and the local protection from middle-high tides, with the elevation of the paving. With regard to the walls, the principal damage is the decay of the physical and mechanical characteristics of the materials, mostly due to the wavy motion and the salt water attack. The restoration works are oriented on the improvement of the existing masonries by consolidation with injections and on the substitution of damaged bricks. All these operations are generally followed by the elevation of the paving, to preserve them from the flooding due to the middle-high tides, that are about the 80% of the tides of the year. In accordance with the national and the Eurocode-EC7 dispositions and on the basis of the geotechnical and hydrological investigations, the stability analysis of the walls was performed. In the paper, the results of the analysis and the fact that such works does not show evident signs of rotational or translational instability, but only deterioration of the masonries, are used to propose, with reference to the restoration works, a criterion for the evaluation of the safety level that considers the experimental evidence of the stability of these walls, testified by their behaviour in the centuries.
Sicurezza e adeguamento dei muri di sponda dei canali nella città di Venezia
DEI SVALDI, ANDREA;MAZZUCATO, ALBERTO;
2004-01-01
Abstract
In the 1995, after about 30 years of inactivity, began in Venice the excavation of the canals. The excavation of the internal canals was always a problem for the city; in fact it was necessary to guarantee the navigability and to perform the maintenance of the walls of the canals. With the motor navigation the problem was subsequently widened, when the deterioration of the buildings, for effect of the wave motion, was revealed as an aspect of primary importance for the safeguard of the walls, so that the radical maintenance of the walls have become the principal activity during the restoration works. In particular, the so called "Progetto integrato rii", that interests about 90 km of walls, provides the excavation of the mud, the restoration works of the walls and of the foundations of the buildings facing the canals, the consolidation of the bridges and the local protection from middle-high tides, with the elevation of the paving. With regard to the walls, the principal damage is the decay of the physical and mechanical characteristics of the materials, mostly due to the wavy motion and the salt water attack. The restoration works are oriented on the improvement of the existing masonries by consolidation with injections and on the substitution of damaged bricks. All these operations are generally followed by the elevation of the paving, to preserve them from the flooding due to the middle-high tides, that are about the 80% of the tides of the year. In accordance with the national and the Eurocode-EC7 dispositions and on the basis of the geotechnical and hydrological investigations, the stability analysis of the walls was performed. In the paper, the results of the analysis and the fact that such works does not show evident signs of rotational or translational instability, but only deterioration of the masonries, are used to propose, with reference to the restoration works, a criterion for the evaluation of the safety level that considers the experimental evidence of the stability of these walls, testified by their behaviour in the centuries.
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