Seite - 983 - in Book of Full Papers - Symposium Hydro Engineering

10. Hengchaovanich D Vetiver system for slope stabilization. In: Proceedings of 3rd International Vetiver Conference, 2003. pp 301-309 11. COE UA (2006) Reliability analysis and risk assessment for seepage and slope stability failure modes for embankment dams. Engineering Technical Letter No 1110-2 561 12. Wolff TF Probabilistic slope stability in theory and practice. In: Uncertainty in the geologic environment: From theory to practice, 1996. ASCE, pp 419-433 13. Elkateb T, Chalaturnyk R, Robertson PK (2003) An overview of soil heterogeneity: quantification and implications on geotechnical field problems. Canadian Geotechnical Journal 40 (1):1-15 14. Kim H-S, Major G, Ross-Brown D Application of Monte Carlo techniques to slope stability analyses. In: 19th US Symposium on Rock Mechanics (USRMS), 1978. American Rock Mechanics Association, 15. Nguyen V, Chowdhury R Probabilistic study of spoil pile stability in strip coal mines—two techniques compared. In: International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 1984. vol 6. Elsevier, pp 303- 312 16. Nguyen V, Chowdhury R (1985) Simulation for risk analysis with correlated variables. Geotechnique 35 (1):47-58 17. Greco VR (1996) Efficient Monte Carlo technique for locating critical slip surface. Journal of Geotechnical Engineering 122 (7):517-525 SUMMARY Landslide and lateral spreading may have severe impact on natural and man- made environment and there is a global concern about their prevention and mitigation. The resistance level of a slope against landslide depends on the materials and the properties it of which is composed. In this paper, enhanced shallow landslide resistance of a slope due to vegetation is investigated. Considering the failure modes and uncertainty in geotechnical parameters, it seems that using probability theory in slope stability is inevitable. Regarding the effect of vegetation phenomenon in diminishing the probability of failure and increasing the stability of reservoir slopes, it is necessary to evaluate slope safety level by conducting reliability analysis. Employing Monte Carlo simulation, a python code is developed and the effect of vegetation is investigated by limit equilibrium analyses. The results demonstrate that vegetation roots have a significant stabilizing effect on the slope, limited to the rooting depth. The reliability index substantially increases due to vegetation. Keywords: Slope stability, Vegetation, Statistical method 983