Integrating geotechnical and geophysical methods in subsurface characterisation of phyllitic schist profile
Integrating geotechnical and geophysical methods in subsurface characterisation of phyllitic schist profile
An integrated approach of geotechnical investigation and geophysical survey was used to characterize a lateritic subsurface profile over phyllitic schist . The study site was delineated into three study areas based on the local topography. Borehole drilling with standard penetration test (SPT) was conducted in the three study areas with associated laboratory tests on recovered samples. The geophysical properties of the subsurface was determined from electrical resistivity tomography (ERT) along profile lines and vertical electrical sounding (VES) conducted at the location of the boreholes. Borehole data was interpolated to obtain subsurface description of the site. The role of parent rock type and topography and drainage conditions has a major influence in the texture of soils developed in a tropical environment. The findings of the geophysical survey indicate a heterogenous subsurface which is not captured in the subsurface profile generated from borehole data only. The study shows that an integrated approach should be adopted to give a detailed characterisation of a subsurface profile developed over phyllitic schist for civil engineering purposes.
Naa Korkoi Ayeh; Samuel I. K. Ampadu; F. J. F. Ayeh; Frederick Owusu-Nimo; Frederick Charkley
18th African Regional Conference on Soil Mechanics and Geotechnical Engineering (ARCSMGE2024)
Soil characterization
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