Vízügyi Közlemények, 1988 (70. évfolyam)

4. füzet - Szeredi István-Jeges Anikó: A végeselemes modellezés lehetőségei a vízépítési létesítmények tervezésében

A végelemes modellezés lehetőségei a vízépítési létesítmények tervezésében 587 В результате моделирования можно определить направление последующих исследований и критические формы возможных повреждений и пути борьбы против них. В целях более широкого применения метода конечных элементов целесообразно и в области проектирования гидротехнических сооружений развивать данный метод с учетом условий практического применения. * * • Finite-element modeling in the planning of hydraulic projects by Dr. I. SZEREDI, С. E. candidate of the technical sciences and A. JEGES (Ms), geologist Finite-element modeling is a tool that may be extremely useful in the early stages of planning. The method is suitable for a more profound and successful analysis in investigating hydraulic establishments and their surroundings. It is well-known, however, that the models were rarely used - up till now - in practice. The reason is: considerable financial and professional input, and the fact that casually prepared programs are alien in the thinking of planners and for practical users, alike. Therefore, it is indispensable that complex, interactive programs be at hand offering considerable freedom in the handling of input information and in the graphical presentation of the results. In the paper, stress calculations of reservoir dikes and of subsurface chambers of a pumped energy storage system are presented by use of the so-called ASKA system. The characteristic cross-section of reservoir dikes (Fig. 1) and the rock-mechanical features of the area (Fig. 2) are also at hand. The circumstances of chamber deployment in this underground power plant are depicted in Fig. 3. The model of the dike - analyzed by 552 elements - is shown in Fig. 4. Figs. 4 to 8 contain the different cases in load : natural conditions before construction, total load with consideration on self-load and water-load. In Fig. 9, the stresses and deformations caused by a 8°MSC earthquake - considered as catastrophic - are presented. The calculated values of maximum acceleration at the dike-crown are seen in Fig. 10. Here, measured and calculated data are in fair coincidence. Largest deformation was found as 56 mm (Fig. 11). In the area of the chambers the model consisted of 3120 elements (Fig. 13). From among the different design load situations the state after eruption is depicted in Fig. 14, while stresses and deformations caused by a tremor are seen in Fig. 16. The results had called attention to some extremely favourable seismic conditions in the area. On the basis of model-results further investigations are induced: for the determination of critical breaking forms and for the possibilities of prevention against such events. Finally, for a broader use of the finite-element method fostering of practical consolidation seems to be useful in course of the planning of hydraulic projects. Möglichkeiten der Finite-Element-Modellierung bei dem Entwurf von wasserbaulichen Anlagen von Dr.-Ing. István SZEREDI und Dipl.-Geol. Anikó JEGES Bei der Untersuchung von Bauwerken und ihrer Umgebung kann die Finite-Element-Modellierung bereits in den Anfangsphasen der Projektierung mit einer Ausführlichkeit und einem Erfolg angewandt werden, welchc diejenigen der herkömmlichen Lösungen von weitem übertreffen. Bekanntlich werden die Finite-Element-Verfahren bei dem Entwurf von wasserbaulichen Anlagen trotzdem nur äußerst selten angewandt, was - außer den notwendigen finanziellen und geistigen