Comparison of static and dynamic stress-strain analysis in earth dams (Case Study: Azadi Earth Dam)

Seismic analysis of earth and pebble dams is generally carried out in two quasi-static and dynamic methods. Although the quasi-static method with easy application and simple assumptions provides barrier safety, it can sometimes lead to unsafe and uneconomical results. In the present study, the Riley attenuation rule is used in stress and strain calculations of the Azadi dam and both nonlinear static and dynamic analysis are used. Also, a simple elastoplastic behavior model based on the Mohr-Coulomb criterion in Abaqus software has been used. Comparison of the results showed that in both analyzes the maximum strain of Azadi dam core was above the core and the highest stress occurred during the earthquake in the bottom. Also, dynamic stress is higher than static in σxx direction 49%, σxy% 30 direction and σyy% 28 direction. At the floor level, the maximum crustal stress is 29% higher in the middle level, 68% higher and in the upper level 72% higher than the core.