Detecting the Shallow Subsurface Chinks below Buildings of District No. 27 at 15th May City Using ERT, and SSR, Helwan, Egypt

Abstract

In 1986, the Egyptian government planned 15th May City, which is located in the southeast of Helwan city. It is considered one of the most propitious cities that pull out the residents who live around the Nile valley in Egypt. This study examines the district No. 27. The chief aim of this paper is to identify the chinks in the near subsurface layer under buildings and calculate approximately its displacement to attain its reasons. This research uses shallow seismic refraction and two dimension electrical resistivity surveys. The three-dimension electrical imaging method is interpreted in the form of the geoelectric layers’ depths and thicknesses. Accordingly, the interpretation proposes sequences of three layers. Moreover, the borders of the crack can be noticed. The results of shallow seismic refraction method show the same sequences of three seismic layers. The interpreted layers from both techniques are dried limestone “calcite to dolomite” layer; the second is wetted Marley limestone; and the third Layer is semi-wetted Marley limestone. Alternatively, these parameters separate the location into layers of dissimilar competence nature and dissimilar appropriateness. The interpretation of both methods delineates five chinks or cracks. These chinks extend in the study area. These chinks can be watched by naked eyes in the buildings close to the area of the study. This study recommends getting rid of the gardens that is located between buildings to avoid the negative effect of irrigation water.