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Delineation of Near-Surface Structure in the Southern Part of 15th of May City, Cairo, Egypt Using Geological, Geophysical and Geotechnical Techniques

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Abstract

The integration of geological, geophysical, and geotechnical interpretation at the southern part of 15th of May City, have been used to evaluate the subsurface stratigraphy, especially the clay layer which may cause serious danger to construction. Those techniques have been used to delineate the subsurface structures as normal faults, which play a critical role on the stability of buildings. Geological setting of the area has been evaluated through the construction of a geological map from different geological sections and samples obtained from more than 30 observation points. Geophysical tools such as vertical electrical soundings (12 VESs), 2-D dipole–dipole array (7 sections), P-wave shallow seismic refraction (31 profiles) and multiple channel analysis of surface waves (31 MASW profiles) have been carried out to image the subsurface situation. Geotechnical evaluation using 26 boreholes, samples, laboratory tests and geotechnical parameters has been done at the area of interest. The geological setting demonstrates that the city had been constructed on the second and third members of Qurn Formation (Upper Eocene) composed of argillaceous limestone, marl and shale. Two normal faults are passing through the area were observed. The resistivity (VES and dipole–dipole) and seismic (P-waves and MASW) results reflect the presence of the two normal faults cross the study area, affecting the obtained section of marl, clayey marl and limestone layers. The geotechnical information indicate the presence of the normal faults and the existence of clay layer with swelling ability reaching 140%, which may cause cracks in the upper layers and/or subsidence.

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Authors and Affiliations

  1. National Research Institute of Astronomy and Geophysics, Helwan, Cairo, Egypt

    Adel M. E. Mohamed & Sultan A. Sultan Araffa

  2. Geological Survey of Egypt, Abbasia, Cairo, Egypt

    Nagi I. Mahmoud

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  1. Adel M. E. Mohamed
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  2. Sultan A. Sultan Araffa
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  3. Nagi I. Mahmoud
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Correspondence to Sultan A. Sultan Araffa.

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Mohamed, A.M.E., Araffa, S.A.S. & Mahmoud, N.I. Delineation of Near-Surface Structure in the Southern Part of 15th of May City, Cairo, Egypt Using Geological, Geophysical and Geotechnical Techniques. Pure Appl. Geophys. 169, 1641–1654 (2012). https://doi.org/10.1007/s00024-011-0415-y

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  • DOI: https://doi.org/10.1007/s00024-011-0415-y

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