Arch Dams: Designing and Monitoring for Safety by Jose O. Pedro

By Jose O. Pedro

The current quantity presents a complete knowing of the fashionable standards, versions and strategies of research of arch dams, for regular operation stipulations and below unprecedented a lot. this data is critical for all these fascinated about the evaluate of the behaviour and of arch dams and different huge buildings, both for layout or tracking purpose.

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Extra info for Arch Dams: Designing and Monitoring for Safety

Example text

The permanent deformations accumulated along the loading-unloading cycles, should therefore be very small, which will be the case ifthe cracking is limited to small volumes (punctual failures), but the majority of the dam and its foundation is far from the failure conditions. 5 to 2 as with regard to the internal friction (in general, the cohesion is the most important parameter for current scenarios); - the seepage and leakage, particularly in the foundation, do not exceed the flow corresponding to an average permeability of 1 Lugeon; - the uplift at the dam base, in the zone of the drainage curtain, does not exceed one third of the water pressure at the dam heel.

Degradation of structural elements: the Monceaux-la-Virole and Rassisse (France), Muro Lucano and Spigno Monferrato (Italy), and Les Toules (Switzerland) arch dams; the Neuber (Tunisia) and Florence Lake (USA) multiple arch dams. The above list of incidents shows that the most frequent causes of deterioration concerning the dam body of arch or multiple arch dams are, on one side, environmental actions (particularly aggressive waters, freezing and thawing) and structural deficiencies (lack of strength and swelling) on the other side.

The practical application of the above probabilistic method becomes, therefore, very difficult, and the usual method, based on the reliability factors, remains the common practice, in spite of the attempts made to develop halfprobabilistic approaches (method of the partial coefficients) (I COLD 1988). The behaviour of the existing dams (which have been designed with the application of the usual reliability factors) in the course of the last century, remains the fundamental source of data for assessing the design criteria of dams.

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