Geoelectric Resistivity Survey for Site Investigation in East Matruh Area, North Western Desert, EgyptWorld Applied Sciences Journal
Geoelectric resistivity survey was conducted for investigating two industrial sites to the east of Matruh city, northwestern coast of Egypt. The process of site investigation is controlled by the occurrence of groundwater, nature of bedrock and presence of shale or clays as prerequisite information for any developmental project. For this purpose, thirty two vertical electric soundings have been conducted on Alam ElRoom and El–Daba''a sites. The resisivity data was calibrated with nearest boreholes in order to guide the interpretation of the resistivity data. The results were presented in the form of litho–resistivity sections. Four subsurface layers were delineated from the interpretation of the results. The sections start with the Holocene calcareous sand (1–5 meters) and ended with the fissured oolitic limestone in Alam ElRoom site and shale intercalated with marl in El–Daba’a site that are saturated with saline groundwater. The increase of salinity of the groundwater in this area could be referred to the location of the investigated sites partially within the splash zone of the sea and consequently the effect of splashing water is expected. The hard and compact limestone bedrock is present in both sites at depth varies from 3 to 10 m and with thickness up to 20m. In El–Daba’a site, the hard limestone bedrock is sandwiched within shale layers and fractured by the E–W faults of the epiorogenic movement that took place during post–Miocene time, while in Alam ElRoom site the geological situation is different where the bedrock limestone is underlain by the fissured oolitic limestone and overlain by calcareous sand. The presence of incompetent shale and clayey layers with faulting the bedrock layer in ElDaba''a site should be taken into consideration during the foundation design and it is expected that the buildings with foundation constructed by either rafting or piling can survive in this site.
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