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首页> 外文期刊>Pure and Applied Geophysics >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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Delineation of Near-Surface Structure in the Southern Part of 15th of May City, Cairo, Egypt Using Geological, Geophysical and Geotechnical Techniques

机译：利用地质，地球物理和岩土技术描绘埃及开罗5月15日南部城市的近地表结构

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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.
机译：5月15日南部的地质，地球物理和岩土工程解释的整合已用于评估地下地层，尤其是可能对施工造成严重危险的粘土层。这些技术已被用来将地下结构划定为正常断层，这对建筑物的稳定性起着至关重要的作用。该地区的地质环境已经通过从不同地质断面绘制地质图和从30多个观测点获得的样品进行了评估。已经进行了诸如垂直电测深（12 VES），二维偶极子-偶极子阵列（7个剖面），P波浅地震折射（31个剖面）和表面波的多通道分析（31个MASW剖面）等地球物理工具。成像地下情况。在感兴趣的区域已经使用26个钻孔，样品，实验室测试和岩土参数进行了岩土评估。地质环境表明该城市建在由泥质灰岩，泥灰岩和页岩组成的古恩组（始新世）的第二和第三部分上。观察到有两个正常断层穿过该区域。电阻率（VES和偶极-偶极子）和地震（P波和MASW）结果反映了研究区内穿越两个正断层，影响了获得的泥灰岩层，粘土泥灰岩层和石灰岩层。岩土信息表明存在正常断层，并且粘土层的溶胀能力达到140％，这可能导致上层裂缝和/或下沉。

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