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

Document Type : Original Article

Authors

1 M.Sc. of Engineering geology, Faculty of Sciences. University of Yazd, I.R. Iran

2 Assistant Professor, Faculty of Natural Science. University of Tabriz, I.R. Iran

3 Assistant Professor, Faculty of Science. University of Yazd, I.R. Iran

Abstract

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.

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References

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Scientific Quarterly Journal of Iranian Association of Engineering Geology
Volume 8, Number 1 & 2
September 2015
Pages 67-78

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History

  • Receive Date: 10 May 2014
  • Revise Date: 20 March 2015
  • Accept Date: 24 April 2016

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