Dynamic stability analysis of jointed rock slopes under earthquake condition (Case study: Gas Flare Site of phase 7 in South Pars gas complex- Assalouyeh)

Evaluation of rock slope stability during earthquake is the most complex issues in the field of rock mechanics studies. Having understanding of the dynamic forces on rock structures play an important role in stability analysis is jointed rock slopes. In this study, the stability analysis of jointed rock slope, is located in the Gas Flare Site form Phase 7 in South Pars Gas Complex under dynamic load using numerical discrete element method (DEM) by the UDEC software has been estimated. The mass of this slope consist Aghajari formation's marl and sandstones. As dynamic load, the earthquake occurred 2013 at 7 km from the studied site with ML= 3.3 magnitude intended and normalised to PGA 0.42g. Based on the results of the static analysis using hybrid modeling method by MATHEMATICA software, the factor of safety (FS) for this slope is 1.26 determined. For dynamic analysis, the model 6 seconds under dynamic waves with the highest acceleration effect in 0.005 sec steps and 0.5% damping is placed. The results of the dynamic analysis shows, this slope under dynamic loads the safety factor to 0.54 dropped and slope is unstabled. Therefore, to stablizaiton of this slope during strong earthquakes requires to using the stabilization plan.