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标题：Application of ERT and SSR to detect the subsurface cave at 15th May City, Helwan, Egypt
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作者：A.A. Basheer ; M.A. Atya ; M. Shokri 等
期刊名称：NRIAG Journal of Astronomy and Geophysics
印刷版ISSN：2090-9977
电子版ISSN：2090-9985
出版年度：2012
卷号：1
期号：1
页码：23-32
DOI：10.1016/j.nrjag.2012.11.003
语种：English
出版社：Elsevier
摘要：Abstract15th May City, 12km 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.