Modern design and technological solutions for earthquakeproof gravity dams: Fid-Bau Portal

Modern design and technological solutions for earthquakeproof gravity dams

Sudakov, V. B. / Marchuk, A. N. / Karavaev, A. V.

Conclusion An analysis of the characteristics of modern design and technological solutions used for earthquakeproof concrete dams, experience of their construction and operation, and generalization of the results of investigations in recent years in the area of design, technology, and materials for hydrotechnical construction lead to the following conclusions. Gravity dams should be recommended for construction in seismically hazardous regions, the transverse profile of which has: a slope of the downstream face I\>-0.80; an inclined upstream face or one outlined by a broken line; a developed contact with the foundation; a small or lightweight head of the dam having a small inertia.The particular values of the slopes of the faces and dimensions of parts of dams should be refined by calculations of their stress-strain state for combinations of loads acting on the dams considered during designing.The recommended profile for earthquakeproof dams, methods of calculating and designing it, and V-shaped cutting in plan should be introduced into the standards.To construct earthquakeproof gravity dams it is necessary, as a rule, to use the method of single-layer concreting with the use of stiff or especially stiff, low-cement concrete mixes.The use of this method makes it possible: to eliminate longitudinal construction joints and to cut the dam only by movement-settlement joints into enlarged sections with temperature notch-joints on the upstream and downstream faces: to provide a rational zonal distribution of concrete; to create an even, favorable temperature regime of the concrete masonry and to provide a low level of technological stresses in the structure, having eliminated their local concentrations; to prevent thermal cracking; to guarantee obtaining in the structure a material having the prescribed design (or higher) technical characteristics.