Analysis of Near Surface Seismic Refraction for Geotechnical Parameters in Opolo, Yenagoa of Bayelsa State

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.

Integration of GIS with the Generalized Reciprocal Method (GRM) for Determining Foundation Bearing Capacity: A Case Study in Opolo, Yenagoa Bayelsa State, Nigeria

“…The focus of our investigation is Opolo, situated in Yenagoa, the capital city of the south-south geopolitical region of Nigeria. Opolo is a swiftly developing urban area within this region [2] . Our study encompasses an area of approximately 170 square kilometers and benefits from a well-developed road network that links various parts of Yenagoa city and its environs.…”

“…This technique is of utmost importance in aiding engineers and geologists in acquiring a deeper understanding of the geological features and characteristics beneath the Earth's surface. The data gathered from seismic refraction surveys holds significant value for a diverse set of purposes, including but not limited to foundation design, site assessment, and geotechnical engineering [2,14] .…”

“…The assessment of foundation bearing capacity holds a pivotal role in the planning and execution of diverse civil engineering projects, encompassing the construction of buildings, bridges, and various infrastructural undertakings [1,2] . The stability of any structure firmly hinges on the soil's appropriateness for a foundation.…”