Effect of Confining Pressures on Dynamic Response Characteristics of Silty Soils in the Niger Delta

Okovido J. O.* and Kennedy C.

Department of Civil Engineering, University of Benin, Benin City, Edo State, Nigeria

*Corresponding Author: johnokovido@uniben.edu

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 Vol. 5 No. 2  | October 2021 | Pages 404 – 412 |   Cite this article

https://doi.org/10.36263/nijest.2021.02.0258

Abstract

ABSTRACT

The probability of earthquake occurrence in the Niger Delta region of Nigeria was studied in this research. The resonant column/bender element tests were used for the study. Series of analysis were carried out on compacted silt in subsoil strata obtained from various locations in Rivers, Bayelsa, Delta and Akwa Ibom States. The effects of confinement on frequency, shear modulus, shear velocity and damping ratio were studied. The tests results revealed that confinement has effects on the investigated parameters. Thus, frequency response increases with increase in confinement pressure. Also, the resonance column test at various confinements revealed changes in shear modulus, accelerometer output and damping ratio. Accordingly, there was high disparity in the tested parameters as confinement pressure was increased. Similarly, the bender element tests also showed that pressure has effect on shear wave-velocity, shear modulus and damping ratio confinement. The shear modulus and shear wave-velocity generally increased as confinement pressure was increased, while damping ratio decreases as confinement pressure was increased. The variations in Resonance Column/Bender Element test parameters showed that the silty soil in the Niger Delta region, an oil and gas rich area, is likely to experience earthquake in the future. Therefore, geological data should be collated for monitoring, especially as several geological activities take place in the region.

Keywords: Earthquake, Confinement Pressure, Seismic Properties

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Okovido J. O. and Kennedy C., 2021. Effect of Confining Pressures on Dynamic Response Characteristics of Silty Soils in the Niger Delta. Nigerian Journal of Environmental Sciences and Technology, 5(2), pp. 404-412. https://doi.org/10.36263/nijest.2021.02.0258


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