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Subsurface Appraisal for Foundation Study using combined Geophysical Techniques: A Case Study of Akinola-Ipetumodu in Basement Complex Southwestern, Nigeria

Authors: ADENIKA Charles Itunu

Publication Type: Journal article

Journal: Acta Satech (journal Of Life &physical Sciences)

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Abstract

Recurrence of structural failures universally has demanded application of geophysical methods to survey the subsurface geology at a construction site for civil engineering structures. Combined ground magnetic and electrical resistivity methods in form of electrical Depth Sounding Survey (DSS) and electrical resistivity profiling (dipole dipole array) were conducted at Akinola area, Ile-Ife, Southwestern Nigeria. The study aimed at providing comprehensive information of subsoil profiles for durable and sustainable civil engineering structures. The magnetic profiles were interpreted qualitatively and quantitatively to generate 2D models that supply information on the structural features (faults/fractures, dykes, or water-bearing fracture zones) and basement reliefs underneath the study area. Likewise, dipole-dipole data obtained from the electrical resistivity profiling were processed and interpreted to produce 2D resistivity structures that revealed the likely existence of linear features underneath the study area. DSS data were qualitatively and quantitatively interpreted to generate geoelectric parameters that were used to produce geoelectric sections. The geoelectric sections reveal four geoelectric layers: the topsoil (clayey, sandy, lateritic), weathered layer (clayey, sandy, lateritic), fractured basement, and fresh basement underlying the study area. The geoelectric sections, 2D resistivity structures, and 2D magnetic models showed good comparison and revealed the presence of subsurface geological structures such as fault/fracture or water-bearing fractured zones. These zones are capable of deteriorating the bearing capacity of the subsoil/parent rock and could cause differential settlement in the foundation of engineering constructions particularly at shallow and intermediate depth. The study therefore, recommends excavation and refilling of low competent (clayey) layers with competent materials and reinforcement of the weak zones.

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ADENIKA,C.I . (2024). Subsurface Appraisal for Foundation Study using combined Geophysical Techniques: A Case Study of Akinola-Ipetumodu in Basement Complex Southwestern, Nigeria , 16 (2), 1-1.

ADENIKA,C.I . "Subsurface Appraisal for Foundation Study using combined Geophysical Techniques: A Case Study of Akinola-Ipetumodu in Basement Complex Southwestern, Nigeria " 16, no (2), (2024): 1-1.

ADENIKA,C.I and . (2024). Subsurface Appraisal for Foundation Study using combined Geophysical Techniques: A Case Study of Akinola-Ipetumodu in Basement Complex Southwestern, Nigeria , 16 (2), pp1-1.

ADENIKACI, . Subsurface Appraisal for Foundation Study using combined Geophysical Techniques: A Case Study of Akinola-Ipetumodu in Basement Complex Southwestern, Nigeria . 2024, 16 (2):1-1.

ADENIKA,Charles Itunu, . "Subsurface Appraisal for Foundation Study using combined Geophysical Techniques: A Case Study of Akinola-Ipetumodu in Basement Complex Southwestern, Nigeria ", 16 . 2 (2024) : 1-1.

A.Charles Itunu , "Subsurface Appraisal for Foundation Study using combined Geophysical Techniques: A Case Study of Akinola-Ipetumodu in Basement Complex Southwestern, Nigeria " vol.16, no.2, pp. 1-1, 2024.

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