the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Liquefaction, landslide and slope stability analyses of soils: a case study of soils from part of Kwara, Kogi and Anambra states of Nigeria
Abstract. 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/cm3 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°. The Coefficient of permeability vary between 8.71 × 10−5 and 1.18 × 10−3. 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. It is recommended that proper and efficient drainage system should be employed in these areas to reduce the influence of pore water pressure in the soil.
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RC1: 'Referee comments', Anonymous Referee #1, 24 Nov 2016
- AC2: 'Response to comment', Christopher Baiyegunhi, 17 Jan 2017
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RC2: 'soil mechanics', Ahmet Karakas, 28 Nov 2016
- AC1: 'Response to comment', Christopher Baiyegunhi, 17 Jan 2017
-
RC1: 'Referee comments', Anonymous Referee #1, 24 Nov 2016
- AC2: 'Response to comment', Christopher Baiyegunhi, 17 Jan 2017
-
RC2: 'soil mechanics', Ahmet Karakas, 28 Nov 2016
- AC1: 'Response to comment', Christopher Baiyegunhi, 17 Jan 2017
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Cited
8 citations as recorded by crossref.
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- Effect of Confining Pressures on the Dynamic Response Characteristics of Niger Delta Clay Soils J. Okovido & C. Kennedy 10.36263/nijest.2021.02.0257
- Slope failures and safety index assessment of waste rock dumps in Nigeria’s major mines O. Igwe et al. 10.1007/s11069-022-05597-0
- Seismic Waves Response Characteristics of Niger Delta Soils J. Okovido & C. Kennedy 10.36263/nijest.2021.01.0255
- Geospatial assessment of landslide-prone areas in the southern part of Anambra State, Nigeria using classical statistical models V. Nwazelibe & J. Egbueri 10.1007/s12665-024-11533-1
- Effect of Confining Pressures on Dynamic Response Characteristics of Silty Soils in the Niger Delta J. Okovido & C. Kennedy 10.36263/nijest.2021.02.0258
- Stability Analysis of Plant-Root-Reinforced Shallow Slopes along Mountainous Road Corridors Based on Numerical Modeling D. Tsige et al. 10.3390/geosciences10010019
- Hydrogeological Assessment of Hydraulic Conductivity on Gully Formation in Erosion Degraded Residual Soil of an Unstable Slope O. Olabode & H. San 10.1007/s40098-021-00585-w