Application of ERT and SSR to detect the subsurface cave at 15th May City, Helwan, Egypt
Application of ERT and SSR to detect the subsurface cave at 15th May City, Helwan, Egypt
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应用 ERT 和 SSR 探测埃及赫勒万市 5 月 15 日地下洞穴
DOI：
10.1016/j.nrjag.2012.11.003
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
M. M. Abu Shady
中科院分区：
文献类型：
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作者：
A. Basheer;M. Atya;M. Shokri;M. M. Abu Shady
15th May City，Helwan市东南12公里处，是埃及政府于1986年计划的承诺城市之一，通过其计划将人口从浓缩的中央尼罗河谷撤回到尼罗河谷埃及的侧面部分。本研究运行在城市的著名和已知的地方，被称为“洞穴”。本研究的主要目的是探测该洞穴的近似形状，并估计其延伸和尺寸参数。研究内容包括二维电阻率法和浅层地震折射波法，二维电成像技术根据地电层的深度和厚度进行解释，表明有一至两个层的连续性，并可探测到洞穴的边界。浅层地震折射波技术的结果揭示了一个到两个地震层的连续性。这两种技术所示的这些层是石灰岩“方解石到白云石”层，第二层是“裂缝石灰岩”。另一方面，这些参数允许将该地区分成不同能力性质的部分，从而不同的适当性，并用于探测和绘制地下洞穴的边界。最后，值得一提的是，在地震剖面的调查深度内，它们的解释层与R2D剖面的解释层的形状和厚度都非常一致，技术，特别是在岩土工程勘察。
15th May City, 12 km to the southeast of Helwan city, is one of promised cities planned in 1986 by the Egyptian government through its program to withdraw the population from the condensed central Nile valley to the side parts of the Nile valley Egypt.The present study runs on the famous and known place of the city that is called “the cave”. The main target of this study is to detect the nearly shape of this cave and estimate its extension and dimension parameters. This study embraces, two dimension electrical resistivity, and shallow seismic refraction surveys.The two dimension electrical imaging technique was interpreted in terms of depths and thicknesses of the geoelectric layers, on this regard, it suggests a succession of one to two layers, and in addition, the boundaries of the cave could be sensed. The shallow seismic refraction technique results revealed a succession of one to two seismic layers. These layers illustrated from both techniques are limestone “calcite to dolomite” layer, and the second layer “fractured limestone”. On the other hand, these parameters allow for separating the area into parts of different competence nature and consequently different appropriateness, and stand to detect and draw the boundaries of the cave underground.Finally, it is outstanding to mention that, within the investigated depth of seismic profiles, their interpreted layers are in close agreement with both shape and thickness of the interpreted layers from the R2D sections and this chains the results obtained from both techniques especially in the geotechnical survey.