Forced vibration test of Masjid Suleiman earthen (Embankment) dam and comparison of results with dynamic parameters of numerical model

Compared to other types of dams, earthen dams have the largest number in the world and considering the growing trend of earthen dam construction in recent years and the high seismicity in some areas, the analysis and design of large earthen dams against earthquakes and supply Its stability in these loading conditions is of special importance and priority in the study of earthen dams. Considering the importance of investigating the seismic behavior of such dams after construction, it is appropriate to use the experience of conducting environmental and forced vibration tests. In this research, the dynamic parameters of Masjid Suleiman earthen dam have been compared by forced vibration test and finite element analysis upstream downstream. The forced vibration test on the said dam is investigated with two vibrating units in the same phase and opposite phase direction. Then, the signals recorded by the sensors installed along the crest of the dam were analyzed and processed using the Fourier spectrum of the on-off test and the frequency response curves, and the natural frequencies, mode shapes, and the corresponding attenuation percentage of each mode were identified and calculated. Then, the numerical model of the dam with material parameter specifications was made based on the results of the geo -seismic test and the material specifications presented in the original design of the dam, and by examining different models with different thickness ratios for the foundation and lateral supports, a fixed thickness was established for these cases. In the final model, it was obtained. And at the end, the compatibility between the results of different finite element models and the forced vibration test was investigated and evaluated.

Keywords:

(Earth) Embankment dam , forced vibration test , natural frequency , mode shape , damping ratio , finite element model