Arch Dams: Designing and Monitoring for Safety by Jose O. Pedro
By Jose O. Pedro
The current quantity offers a entire realizing of the fashionable standards, versions and techniques of research of arch dams, for regular operation stipulations and below unparalleled quite a bit. this knowledge is critical for all these taken with the overview of the behaviour and of arch dams and different huge constructions, both for layout or tracking purpose.
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Extra info for Arch Dams: Designing and Monitoring for Safety
The Venda Nova arch-gravity dam is a concrete structure (97 m high, a crest length of 294 m), completed near Guimaraes (Portugal) in 1951 (Fig. 17). The foundation rock mass is mainly formed by a granite, with schistose rocks at the higher elevations on the right bank. It is crossed by many joints and faults, filled with clay or mylonite. The treatment of the foundation consisted in consolidation, grouting, waterproofing. A 50 m deep grout curtain as well as a drainage system were installed. and An important seepage was observed after some years of operation, and, in spite of the repair works made in 1964 and 1968, the seepage and the uplift pressure continued to increase during the seventies and eighties.
2 - As referred to above, the experience already assembled on the evaluation of the safety and performance of dams, allows an assessment of the used criteria, models and methods of analysis. ); Safety and Performance of Arch Dams 51 -at the level of the models, by checking the results of the model (which incorporate the approximations of the analysis and the data on the structural properties) with the corresponding results of the monitoring for a given period of the dam's lifetime (by means of quantitative analysis or back-analysis); - at the level of the criteria, by checking the occurrence of the hazard and current scenarios, in the course of the dam's lifetime, with the evaluations of the safety and performance criteria (which incorporate the approximations of the models, the methods of analysis and the data on structural properties).
In the case of dynamic problems, boundary conditions avoiding the wave reflection for the foundation and the reservoir, are often used (Pedro and Camara, 1986). 0. Pedro Boundary conditions may also be used to limit the volume of the model to be analysed (symmetry or anti-symmetry conditions), and to perfonn a detailed study of a specific part of the structure by means of successive analyses (Pedro et al 1973, 1976, 1987a). For the hydraulic models, the main direct effects are the discharge flow and water pressure in the appurtenant works, the seepage and leakage through the dam and the foundation, the pore pressure and uplift, and the turbidity and mineralization of the seepage water.