Papers by Ibtissam Khoudi
DESCRIPTION étude de corrélation entre les endommagement dans le sol et les paramètres descriptiv... more DESCRIPTION étude de corrélation entre les endommagement dans le sol et les paramètres descriptives de mouvement fort
The total volumetric strain of soil seems to be an important soil damage criterion during earthqu... more The total volumetric strain of soil seems to be an important soil damage criterion during earthquakes. Using the 150 strong motions database, empirical correlations are developed between amplitude strong motion parameters (peak ground acceleration, PGA, peak ground velocity, PGV and peak ground displacement, PGD) and between this parameters and the percentage of total volumetric strain. This work aims to highlight the parameter that best able to characterize an earthquake and the indicator that is the preferred for predicting damage in loose soil. The results of the correlations analysis between amplitudes parameters show that PGV is the parameter which best characterize the earthquakes than the others parameters and that PGA and PGV have a good linear dependence. Thus the correlations between the amplitude parameters and the volumetric strain of soil show that PGV is harmfulness indicator which best represents the damage in the loose soils during an earthquake. In addition, a predi...
IIZI conference 2015, 2015
In current practice, to perform a seismic site study, the main step consists in defining the stro... more In current practice, to perform a seismic site study, the main step consists in defining the strong motion acceleration in the bedrock condition. The selection of accelerograms depends only on magnitude and distance to the seismic source. However, one ignores in this selection other strong motion parameters with influence on the behaviour of the soil under seismic motions. This contribution deals with the analysis of the correlation between soil damage and strong motion parameters that result on a better selection of strong motion. We consider the total volumetric strain of the soil as damage indicator during a strong earthquake. A strong motion database with 200 bedrock accelerograms having magnitude between 4 and 8 is used. About twenty strong motion parameters such as Cumulative Absolute Velocity (CAV), arias Intensity (I a), Peak-Ground Velocity (PGV), Peak-ground acceleration (PGA), etc., are computed for each accelerogram with their respective auto and inter correlation. A number of 200 nonlinear seismic analyses were performed using the PLAXIS 2D software. The results obtained show a good correlation between the total volumetric strain of soil and the velocity parameters of the seismic movement, and a relatively low correlation with the total volumetric strain of soil and the velocity parameters of the seismic movement, and a relatively low correlation with the acceleration.
Nat Hazards (2017) 87:1859–1879 , 2017
The natural hazard assessment is hampered by many difficulties due to the complexity of the pheno... more The natural hazard assessment is hampered by many difficulties due to the complexity of the phenomenon and the need to manage simultaneously several natural and/ or technological hazards. Such is the case of most unstable urban sites in Algeria. The paper presents a risk analysis study of landslides and their reactivation in Tigzirt coastal city, located in the north of Algeria, which is classified in a moderate seismic zone. The spatial techniques based on geographic information systems are used to assess landslide susceptibility and hazard. Two qualitative studies of landslide hazard assessment are conducted using parameters defining the Algerian landslides context. The hazard is evaluated by performing a combination of the landslide susceptibility and the urban density. Earthquakeinduced landslide hazard is assessed taking into account the Algerian seismicity. The study led to determination and mapping of the hazard induced by Tigzirt landslides.
Soil Dynamics and Earthquake Engineering, 2004
Conference Presentations by Ibtissam Khoudi
Abstract: The phenomenon of soil liquefaction is one of the factors damaging the structures and i... more Abstract: The phenomenon of soil liquefaction is one of the factors damaging the structures and is the cause of many human and material disasters around the world especially in seismic zones. This work focuses on dynamic modeling of a saturated sandy soil, with the computer code PLAXIS 2D. Attention is therefore worn on two orientations: the one based on the study of the dynamic response of a saturated sandy soil profile yb evaluating the Fourier spectrum and response and the other on the evaluation of hte variation in pore pressure and the effective stresses, varying the level of the water table of the site. Profile studied in this paper is located in the city of Boumerdès (Algeria). This region si located within the geographical antricilan Kabyle, forming a projection of the crystalline basement of the domain former Northern Algeria. The modeling showed that the liquefaction occurs rapidly, the water between the pores is put under pressure. The continued increase of the pore pressure led to a reduction in inter-granular forces in the soil and the material loses all its resistance when the pore pressure increased and the effective stress decreases.
Keywords: liquefaction, modeling, PLAXIS, dynamic response, pore pressure.
European conference on earthquake engineering and seismology , 2014
The total volumetric strain of soil seems to be an important soil damage criterion during earthqu... more The total volumetric strain of soil seems to be an important soil damage criterion during earthquakes. Using the 150 strong motions database, empirical correlations are developed between amplitude strong motion parameters (peak ground acceleration, PGA, peak ground velocity, PGV and peak ground displacement, PGD) and between this parameters and the percentage of total volumetric strain. This work aims to highlight the parameter that best able to characterize an earthquake and the indicator that is the preferred for predicting damage in loose soil. The results of the correlations analysis between amplitudes parameters show that PGV is the parameter which best characterize the earthquakes than the others parameters and that PGA and PGV have a good linear dependence. Thus the correlations between the amplitude parameters and the volumetric strain of soil show that PGV is harmfulness indicator which best represents the damage in the loose soils during an earthquake. In addition, a prediction model of volumetric soil deformation is proposed and the performance of the predictive equation was checked according to the correlation coefficient R², variance (VAF) and the root mean square error (RMSE).
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Papers by Ibtissam Khoudi
Conference Presentations by Ibtissam Khoudi
Keywords: liquefaction, modeling, PLAXIS, dynamic response, pore pressure.
Keywords: liquefaction, modeling, PLAXIS, dynamic response, pore pressure.