American Society of Civil Engineers


Influence of Soil Spatial Variability and Stochastic Ground-Motion on the Dynamic Behavior of a Slope


by Tamara Al-Bittar, (Ph.D. Student, University of Nantes, GeM, UMR CNRS 6183, Bd. de l’université, BP 152, 44603 Saint-Nazaire cedex, France E-mail: Tamara.Al-Bittar@univ-nantes.fr), Dalia Youssef Abdel Massih, (Assistant Professor, Notre Dame University, Louaize, Civil and Environmental Engineering, P.O. Box: 72 Zouk Mikael, Lebanon E-mail: dabdelmassih@ndu.edu.lb), Abdul Hamid Soubra, M.ASCE, (Professor, University of Nantes, GeM, UMR CNRS 6183, Bd. de l’université, BP 152, 44603 Saint-Nazaire cedex, France E-mail: Abed.Soubra@univ-nantes.fr), and Fadi Hage Chehade, (Professor, Modeling Center, PRASE, Doctoral School of Science and Technology, Beirut, Lebanese University, Lebanon E-mail: fchehade@ul.edu.lb)
Section: Impact of Spatial Variability in Analysis and Design, pp. 2932-2941, (doi:  http://dx.doi.org/10.1061/9780784412121.300)

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Document type: Conference Proceeding Paper
Part of: GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
Abstract: A probabilistic dynamic approach is used for the slope stability analysis. In this approach, the effect of both the soil spatial variability and the variability of the Ground-Motion (GM) time history on the dynamic responses (amplification, permanent displacement) are studied and discussed. The soil shear modulus G is considered as an isotropic non-Gaussian random field. The simulation of random acceleration time histories based on a real target accelerogram is done using a fully nonstationary stochastic model in both the time and the frequency domains. The deterministic model is based on numerical simulations. An efficient uncertainty propagation methodology which builds up a sparse polynomial chaos expansion for the dynamic responses is used. The probabilistic numerical results have shown that: (i) the decrease in the autocorrelation distance of the shear modulus leads to a small variability of the dynamic responses; (ii) the randomness of the earthquake GM has a significant influence on the variability of the dynamic responses; (iii) the probabilistic mean values of the dynamic responses are more critical than the deterministic ones.


ASCE Subject Headings:
Spatial analysis
Soil analysis
Ground motion
Slopes