REDUCTION OF THE SHEAR STRENGTH OF SOILS IN THE NIGER DELTA AREA OF NIGERIA DUE TO CRUDE OIL PRODUCTION
DOI:
https://doi.org/10.4314/njt.292.72Keywords:
crude oil, shear strength, engineering properties of soils, Niger DeltaAbstract
The research was targeted at finding out if crude oil polluted soils in the Niger Delta Area of Nigeria will still retain their original values of geotechnical properties. If not, establish, the effect of crude oil pollution on the geotechnical properties of the crude oil polluted soils and determine the shear strength of the affected soils. This was achieved by carrying out soil investigations at randomly selected crude oil polluted sites and also carrying out another set of soil investigations at nearby locations which enabled the geotechnical properties of the crude oil polluted soils to be compared with those of unpolluted soils. Evaluation of the effects of crude oil pollution on the engineering properties of the affected soils and comparison with the engineering properties of unpolluted soils of similar soil structure within the same zone was carried out. Decrease in values of un-drained cohesion, un-drained angle of internal friction, optimum moisture content, maximum dry density, coefficient of consolidation, coefficient of permeability of the polluted soils were established from the study. The mathematical interrelationship (Mohr-Coulomb equation) between these soil properties and shear strength and soils was used to establish the reduction in shear strength of polluted soils.
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