The seismic behavior of asphaltic concrete used in embankment dams subjected earthquake loads has been studied. In order to evaluate the dynamic behavior, an extensive series of monotonic and cyclic tests were carried out on triaxial specimens of asphalt concrete used in hydraulic structures. The MTS-dynamic equipment at the Norwegian Geotechnical Institute (NGI) was used for this purpose. Temperature and frequency eŠects on specimen behavior and on specimen degradation have been studied under the cyclic loads in both isotropic and anisotropic initial stress conditions. For investigation of the fatigue behavior, thousands of cyclic loads were imposed on some of the specimens. Moreover, to study any sign of material degradation due to the cyclic loading, the post-cyclic monotonic stress-strain curve was compared with the corresponding curve for specimens that were notˆrst subjected to cyclic loading. Geotechnical parameters to be used in dynamic numerical analysis models are also presented.
The seismic behaviour of asphaltic concrete core dam under earthquake loads has been studied. The study consists of three parts; element tests on asphalt concrete, numerical analysis and some model tests. In theˆrst part, a series of triaxial monotonic and cyclic tests were performed at the Norwegian Geotechnical Institute (NGI)'s laboratory to determine the geotechnical parameters of asphalt concrete. Then, numerical analyses were carried out for Garmrood dam in Iran with a height of 110 m. The diŠerent stages of construction and impounding were analyzed using a hyperbolic stress-strain model. The dynamic analysis was then performed using two diŠerent models; nonlinear elasto-plastic material model and an equivalent linear method followed by the Newmark approach to estimate the permanent displacements. Finally, some 1-g model shaking table tests were performed on a typical rockˆll dam to have a qualitative picture of the modes of seismic behaviour of an asphaltic concrete core rockˆll dam. Element tests result shows that the asphaltic concrete is resistant to earthquake excitations and the earthquake has to be very strong to cause any detrimental cracking or material degradation of the properties of a ductile asphaltic concrete. In addition, the obtained results from numerical analysis and model tests show the appropriate response of the dam during and after earthquake caused shaking.
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