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首页> 外文期刊>Journal of geophysics and engineering >1D and 3D resistivity inversions for geotechnical investigation
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1D and 3D resistivity inversions for geotechnical investigation

机译：一维和三维电阻率反演，用于岩土工程研究

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The resistivity method is frequently used in the investigation of the shallow parts of the earth. Interpretation of such data is usually done assuming a layered earth. However, a more complete imaging can be obtained if 3D models are used. Thirty-five vertical electrical soundings (VES) were carried out in a regular mesh at the northwestern part of Greater Cairo in order to characterize different geological units and to study their quality for building foundations. Models obtained from ID inversion of each VES, together with borehole information, were used for construction of eight geoelectrical sections which exhibit the main geoelectrical characteristics of the geological units present in the area. The 3D inversion of the data indicated a complex subsurface electrical resistivity distribution conditioned by lithology, water content and tectonic structures. The results indicate that the subsurface consists of different geologic units such as gravel and sand, sand, clay and limestone. The main results are related to the characterization of the clay formations in the north of the survey area, which is revealed by low-resistivity values (< 100 Ω m) and sand layers associated with high-resistivity values (> 600 Ω m) depicted in the central part of the study zone.
机译：电阻率法常用于研究地球浅层部分。通常在假设地球是分层的情况下对此类数据进行解释。但是，如果使用3D模型，则可以获得更完整的成像。在大开罗西北部的规则网格中进行了35次垂直电测深（VES），以表征不同的地质单元并研究其在建筑基础上的质量。从每个VES的ID反演获得的模型以及钻孔信息被用于构建八个地电断面，这些断面展现出该地区存在的地质单元的主要地电特征。数据的3D反演表明，复杂的地下电阻率分布受岩性，含水量和构造结构的影响。结果表明，地下由不同的地质单元组成，例如砾石和沙子，沙子，粘土和石灰石。主要结果与调查区北部粘土层的特征有关，这通过低电阻率值（<100Ωm）和与高电阻率值相关的砂层（> 600Ωm）得以揭示。在研究区的中央。

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