Journal de géologie et géophysique
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Abstrait

Identification Of The Soil Characteristics Utilizing The 2D Resistivity Imaging And Down-Hole Seismic Refraction Techniques: A Case Study In Tenth Of Ramadan City, Egypt

Soliman SA

Electrical resistivity imaging and seismic refraction in form down-hole survey have been applied to delineate the subsurface section, elastic moduli and identify geotechnical characteristics of subsurface materials in 10th Ramadan industrial area. A geotechnical study is necessary before any proposed engineering design to construct any building to avoid the building from collapsing. Therefore, it is important to know the geotechnical properties of the soil on which the new industrial zone is built in order to implement the development plans of this zone. Four 2-D profiles of electrical resistivity in form dipole�??dipole and Wenner configurations. The ERT results reveal that, the subsurface section contains two main geo-electrical layers; the first is medium to coarse sand, some silt and calcareous pebbles which reflect resistivity values ranging from 25 to 65.5 ohm m. overlying the high resistivity layer have resistivity value range from 65.5 to135 Ohm m. corresponding to medium to coarse sand, with gravel and calcareous materials. In this work, down hole technique were used to measurement velocities of P and S waves in order to derive the low strain dynamic elastic properties such as Poisson�??s ratio, Shear modulus, stress ratio, concentration index, N-value, ultimate and allowable bearing capacity of the subsurface soil down to an approximate depth of 30 m in the borehole at site. In addition, Vs30 value was calculated and the soil was categorized as an NEHRP class (D). Furthermore, the result of geotechnical parameters and elastic moduli realistic and sensible for engineering constructions and imply that the soil in the study area is characterized by fairly to moderately competent quality.