Abstract
Abstract The city of Algiers (Algeria) is a highly seismic area, and therefore, soil liquefaction poses a major concern for structures resting on sandy soil. A campaign of 62 static penetration tests or cone penetrometer tests (CPT) was carried out on a site located in the commune of Dar El Beïda in Algiers. The soil Liquefaction Potential Index (LPI) values were assessed, for each borehole, based on the simplified procedure of Seed and Idriss. On the other hand, the geographic information system and geostatistical analysis were used to quantify the risk of soil liquefaction at the studied site. It is worth mentioning that the (LPI) was taken as a regionalized variable. In addition, the experimental variogram was modeled on the basis of a spherical model. Also, the interpolation of the LPI values in the unsampled locations was performed by the Kriging technique using both isotropic and anisotropic models. Kriging standard deviation maps were produced for both cases. The cross-validation showed that the anisotropic model exhibited a better fit for the interpolation of the values of the soil liquefaction potential. The results obtained indicated that a significant part of the soil is liable to liquefy, in particular in the northwestern region of the study area. The findings suggest that there is a proportional relationship between the risk of liquefaction and the increase or decrease in seismic acceleration.
Highlights
The city of Algiers (Algeria) is a highly seismic area, and soil liquefaction poses a major concern for structures resting on sandy soil
This method is based on the Standard Penetration Test (SPT), Cone Penetration Test (CPT), Marchetti Dilatometer Test (DMT), Shear Wave Velocity Measurement Test, and other laboratory tests, such as the cyclic triaxial test
The present study aims to calculate the soil Liquefaction Potential Index (LPI), which represents a measure of the total risk of soil liquefaction over a strip 20 m deep
Summary
Abstract: The city of Algiers (Algeria) is a highly seismic area, and soil liquefaction poses a major concern for structures resting on sandy soil. The occurrence of liquefaction in soils is often assessed using the originally simplified method proposed by Seed and Idriss (1971).[27] This method is based on the Standard Penetration Test (SPT), Cone Penetration Test (CPT), Marchetti Dilatometer Test (DMT), Shear Wave Velocity Measurement Test, and other laboratory tests, such as the cyclic triaxial test These methods are based on the calculation of the safety factor. A basic tool of geostatistics; the second one concerns the use of this spatial structure with known measured values, for the optimal prediction at unmeasured points, using the Kriging technique Another advantage of the geostatistical analysis, over traditional interpolation methods, is the production of standard deviation maps of the predicted values. A geostatistical analysis was performed to study the spatial variation of the liquefaction potential index and to map the areas at risk of liquefaction using the Geographic Information System (GIS). The possible acceleration of the ground taken into account during earthquakes is between 0.2 g and 0.25 g
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