Evaluation of the Peak Ground Acceleration on Seismic Characteristic of Critical Slice Surface on Embankment dams
Subject Areas : Analysis of Structure and Earthquake
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Keywords: Keywords: embankment dams, Masjed Soleiman dam, dynamic analyses, peak ground acceleration,
Abstract :
Abstract: Usually, safety of slip surfaces in embankment dams have been evaluated with 2 methods: peak ground acceleration increasing method and stuff resistance decreasing method are 2 main methods for evaluation of critical bound. In this research, peak ground acceleration increasing method has been used to evaluate stability safety of slip surfaces. In this method, peak ground acceleration has been increased to receiving critical bounds for parameters in time domain (for example permanent deformation, equal dynamic factor of safety, and minimum dynamic factor of safety). To evaluate the effect of this parameter, Masjed Soleiman dam has been selected for a case study. 10 Finite Element model of Masjed Soleiman dam has been constructed considering the Mohr-Coulomb failure criterion for the body of the dam. The 2 earthquake records have been applied horizontally to the bedrock as the input for dynamic analysis without any change in frequency content. Results show that, in critical sliding surface on downstream, with increasing of peak ground acceleration, equal dynamic factor of safety decreased but changing of minimum dynamic factor of safety and permanent deformation have meaningful process.