Adjustment of spectral pseudo-static approach to account for soil plasticity and zone seismicity

• Published in: Canadian geotechnical journal 2019-02, Vol.56 (2), p.173-186
• Main Authors: Karray, Mourad, Hussien, Mahmoud N, Souilem, Mohamed, Locat, Pascal, Mompin, Rémi
• Format: Article
• Language: English
• Subjects: Agreements; Clay; Coefficients; cohesive soil; Compatibility; Computer simulation; Earthquakes; failure surface; Geological research; indice de plasticité; Inertia; Laboratory tests; Mathematical models; Mechanical properties; Modelling; Numerical analysis; Plasticity; Plasticity index; Profiles; pseudo-statique spectral; Safety factors; Seismic activity; Seismic analysis; Seismic stability; seismic zone; Seismicity; Seismology; Slope; Slope stability; Slopes (Landforms); Software; Soil; Soil characteristics; Soil dynamics; Soil mechanics; sol cohésif; Spectra; spectral pseudo-static; Stability analysis; surface de rupture; zone sismique
• ISSN: 0008-3674; 1208-6010
• DOI: 10.1139/cgj-2017-0414

The concept of the spectral pseudo-static procedure has been developed at the Université de Sherbrooke as an alternative to the conventional pseudo-static approach for the seismic stability analysis of clayey slopes. The destabilizing effect of an earthquake is approximated, in the new approach, by an inertial force that hyperbolically varies with depth while being proportional to the maximum acceleration of the seismic event. Its results have been rigorously verified against available static and dynamic laboratory tests, and have been extensively validated by a series of simulations performed using the computer code FLAC. Good agreements have been achieved between the results of the spectral pseudo-static procedure and complete numerical analyses, in terms of the computed safety factors and the critical slip surfaces. This implies that the spectral pseudo-static approach can be integrated into available limit equilibrium (LE) software providing a useful tool to examine the effect of dynamic soil characteristics on the proposed seismic coefficient profiles. The herein-reported study extends the previous endeavors to examine and quantify the effect of plasticity index (PI) (0%, 15%, 30%, 50%, and 100%) on the proposed formula of seismic coefficient profile using the same numerical modelling and assumptions. Original analyses were carried out considering earthquakes compatible with the seismicity of Quebec City (zone 4), and they have been repeated in the current study for earthquakes compatible with other regions having different seismicity (zones 2, 3, and 5). Based on the results of the current analyses, side-formulas were established between the spectral pseudo-static coefficient on ground surface for any value of soil plasticity index (PI) and the corresponding coefficient originally used in the main formula (PI = 30%).