ABSTRACT
The Imiringi Road is a vital transportation route in the region of investigation, connecting several towns and villages and providing access to important economic and social activities. However, in recent years, there have been increasing reports of road failure along this stretch. This has led to significant disruptions in transportation, economic losses, and safety concerns. The subject is to investigate the subsurface conditions along Imiringi road and determine the causes of road failures using geophysical electrical resistivity imaging (ERI) tool. The geophysical electrical resistivity imaging method was used applying the Schlumberger electrode configuration. The Abem terra meter SAS 1000, cables, metal electrodes, measuring tape, hammer, GPS etc. The Surfer12 software was used for processing, inverting and modeling the data acquired from the field.Result: The geo-electric sections identified four geo-electric/geologic subsurface layers namely: the topsoil, sand, moderately resistive sandstone, and highly resistive sandstone.Topsoil (VES1) ranged from 94-186 Ωm and thickness rang 0.8 to 1.1 m which comprises of clay, clayey sand, sandy clay, and sand, Sandy formation (VES2) ranging from 352 – 569 Ωm with its thickness 3.5 – 8.8 m. Moderately sandstone (VES3) ranging from 833 – 6008 Ωm with thickness 3.9 – 28.8 m, while highly resistive sandstone (VES4) has a resistivity values ranging from 907555 – 95594 Ωm. The topsoil is not competent for road construction due to clayey nature of the topsoil and most of the topsoil thickness will be excavated through the construction processes while second layer is highly recommended for the road construction. Geophysical investigations, competent contractors and standard materials should be considered when constructing roads.
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