TY  - JOUR
T1  - Liquefaction, Landslide and Slope Stability Analyses of Soils: A Case Study of Soils from Part of Kwara, Kogi and Anambra States of Nigeria
AU - Ige, Omoniyi Olusegun AU - Oyeleke, Tolulope AU - Baiyegunhi, Christopher AU - Baiyegunhi, Temitope Love 
JO  - Journal of Engineering and Applied Sciences
VL  - 14
IS  - 13
SP  - 4387
EP  - 4404
PY  - 2019
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2019.4387.4404
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2019.4387.4404
KW  - Liquefaction
KW  -landslide
KW  -slope stability
KW  -geotechnical analyses
KW  -Nigeria
KW  -slope failure
AB  - Landslide is one of the most ravaging natural disaster in the world and recent occurrences
in Nigeria require urgent need for landslide risk assessment. A total of nine samples representing three
major landslide prone areas in Nigeria were studied with a view of determining their liquefaction and
sliding potential. Geotechnical analysis was used to investigate the liquefaction potential while the slope
conditions were deduced using SLOPE/W. The results of geotechnical analysis revealed that the soils
contain 6-34% clay and 72-90% sand. Based on the unified soil classification system, the soil samples
were classified as well graded with group symbols of SW, SM and CL. The plot of plasticity index against liquid
limit shows that the soil samples from Anambra and Kogi are potentially liquefiable. The liquefaction screening
criteria also revealed that Anambra and Kogi are potentially susceptible to liquefaction whereas samples from
Kwara are not susceptible to liquefaction. Samples from Kogi and Anambra have lower values of MDD and
OMC, ranging between 1.64-1.80 g/cm<sup>3</sup> and 8.0-12.3%, respectively. These values showed that the samples are
granular material with soil having anticipated embankments performance, subgrade and base
material as poor-fair, fair-good and good-poor, respectively. The direct shear strength test on the soil
samples indicated that the cohesion and angle of internal friction varies between 40-80 kPa and 24-35&deg;
. The Coefficient of permeability vary between 8.71&times;10<sup>-5</sup> and 1.18&times;10<sup>-3</sup>. The Factor Of Safety (FOS) values for
soils from Anambra, Kogi and Kwara are 1.452, 1.946 and 2.488, respectively. These values indicate stability but
care must be taken as the condition at the site shows that the slope is in its state of impending failure. The FOS
for dry slope was higher when compared to the FOS values from wet slope. This was due to the effect of pore
water pressure on the soil as it reduced the shear strength of the soil. A reduced value of FOS was observed
in the model under loading conditions which indicate that loading is also a contributing factor to the slope
failure.
ER  -