Analysis of Near Surface Seismic Refraction for Geotechnical Parameters in Opolo, Yenagoa of Bayelsa State
Francis Omonefe *
Department of Physics, Niger Delta University, Amassoma, Nigeria.
Eteh Desmond
Department of Geology, Niger Delta University, Amassoma, Nigeria.
Oborie Ebiegberi
Department of Geology, Niger Delta University, Amassoma, Nigeria.
Oboshenure Kingsley Karo
Department of Physics, Niger Delta University, Amassoma, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
Three surface refraction seismic profiles were conducted in a site targeted for huge construction in an underdeveloped area in Opolo, Yenagoa city to portray some of the subsurface soil engineering characteristics for the purposes of construction. The Generalized Reciprocal Method (GRM) was used to interpret the acquired P and S-wave. Various shallow rock engineering parameters such as Oedometric modulus, Concentration Index, Material Index, Lame’s constant, Density Gradient, Stress Ratio, Shear modulus, Bearing capacity, and N-value were calculated in other to assess the strength of the subsurface from a geophysical and engineering perspective. The values from the seismic velocity and strength parameters indicates that the bedrock layer (layer 3) of the area studied is characterized by more competent rock quality than layer 1 and 2. Hence, the Opolo site is suggested for construction activities with percussive measures.
Keywords: Geotech, seismic refraction, construction site, Yenagoa