Application of the Electrical Resistivity Method for Site Investigation in University of Anbar, Ar-Ramadi City, Western Iraq

Abstract

The 2D resistivity imaging technique was applied in an engineering study for the investigation of subsurface weakness zones within University of Anbar, western Iraq. The survey was carried out using Dipole-dipole array with an n-factor of 6 and a-spacing values of 2 m and 5 m. The inverse models of the 2D electrical imaging clearly show the resistivity contrast between the anomalous parts of the weakness zones and the background resistivity distribution. The thickness and shape of the subsurface weakness zones were well defined from the 2D imaging using Dipole-dipole array of 2 m a-spacing. The thickness of the weakness zone ranges between 9.5 m to 11.5 m. Whereas the Dipole-dipole array with a-spacing of 5 m and n-factor of 6 allocated the geoelectrical stratigraphic layers sequence in low-accuracy of weakness zones, but deeper than the inverse model of 2 m a-spacing. This survey was made to explain the correlation between the weakness zone and the deeper layers in the study area. It points out that the deeper layers were not affected in the weakness zones. The inverse model was produced using the Standard Least-Squares Inversion Method and the Robust Inversion Model Constraints Method. The first method had a gradational boundary of the weakness zones and the second had sharper and straighter boundaries of fractures and voids within the weakness zones.

Detection of Shallow Cavities Using 3D Resistivity Technique in a Small Site Near Haditha City, Western Iraq

“…this indicates that the region is characterized by a shallow cavity, while is more dangerous for engineering projects. This is consistent with the studies conducted by [2,8,9,25,31] to study the karst phenomena of the areas adjacent to the study area, in terms of the spread and size of caves.…”

“…As for the environmental study, it included the pollution of groundwater by oil leaks through fractures in the rocks. [1][2][3][4][5][6][7][8].…”

The Effects of Some Physical and Chemical Factors on Apparent Resistivity of Surface Soil in the University of Mosul, Mosul City, Northern Iraq

“…Soil characteristics are of a great importance in many applied fields, such as agriculture [1], construction [2], and earthing installation [3]. One of the important physical properties of soil is the electrical resistivity (ρ), which can be defined as the resistance in ohms between the opposite faces of a unit cube of the material.…”

Using 2D Resistivity Imaging Technique to Detect and Delineate Shallow Unknown Cavities In Al-Haqlaniyah Area, Western Iraq

“…[11][12][13][14] used 2D resistivity imaging technique to delineate the subsurface fracture characteristics. Some authors have used integrated 1D resistivity, and 2D and 3D imaging (by parallel 2D) surveys for the detection of subsurface structures, such as [15][16][17][18][19].…”