TITLE:
Determination of Incompressibility (Bulk Modulus), Elasticity (Young’s Modulus) and Rigidity (Shear Modulus) of Uyo and Its Environ, Southeastern Nigeria
AUTHORS:
Ubong E. Essien, Akaninyene Okon Akankpo, Magnus U. Igboekwe, Emmanuel B. Umoren
KEYWORDS:
Uyo, Velocity, Seismic Refraction, Sediments, Vp/Vs
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.11 No.1,
January
30,
2023
ABSTRACT: In this work, seismic refraction was used to obtain elastic properties
(shear modulus (μ), Young modulus (E),
Bulk modulus (K) and lithological
information in Uyo and its environ as an aid to engineering foundation. Using
seismic refraction method, the top and weathered layer of the engineering
foundation in the study area was investigated to determine the elastic
parameters of top soil and also assess the strength of engineering foundation based
on the parameter distribution. A 24-channel signal enhancement seismograph,
geophones, sledge hammer and a metal plate (source) for generating seismic waves were
used. The study area lies between latitudes 4˚45' and
5˚15'N and between longitudes 7˚45' and
8˚30'E in the Niger Delta region of southern Nigeria. Geologically, the area
is located in the Tertiary to Quaternary
Coastal Plain Sands (CPS) (otherwise called the Benin Formation) and Alluvium
environments of the Niger Delta region of southern Nigeria. Shear Modulus had
average values of 0.43 × 108 N/m2 and 1.40 × 108 N/m2 for layers 1 and 2 respectively. The average values of the
Young Modulus for layers 1 and 2 were determined as 2.32 × 108 N/m2 and 3.84 × 108 N/m2 respectively. The average values of
the bulk Modulus for layers 1 and 2 were estimated as 1.52 × 108 N/m2 and 4.93 × 108 N/m2 respectively.