Slope stability analysis of mine waste dumps at a mine site in Southeastern Nigeria

Igwe, Ogbonnaya; Chukwu, Chidinma

doi:10.1007/s10064-018-1304-8

Cited by 32 publications

(12 citation statements)

References 38 publications

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“…These values indicated unstable slopes for NNO1 and critically stable slopes for NNO3. This highlights the heightened hazard of the gullies during the rainy season, when the slopes are either partially or fully saturated, aligning with the findings of Igwe and Chukwu 29 . Furthermore, the decrease in FoS values during the rainy season was attributed to the rise in pore pressure and unit weight of the soil, resulting in reduced shear strength of the slope materials.…”

Section: Coefficient Of Permeabilitysupporting

confidence: 83%

Comparative analysis of the expansion rate and soil erodibility factor of some gullies in Nnewi and Nnobi, Southeastern Nigeria

Nzereogu,

Igwe,

Emeh

et al. 2023

Sci Rep

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The research focused on assessing the expansion rate and soil erodibility factor (K) of specific gullies located in Nnewi and Nnobi, Southeastern Nigeria. Fifteen representative gullies were studied extensively. The Grain size distribution analysis revealed that the soils are composed of gravel (5.77–17.67% and 7.01–13.65%), sand (79.90–91.01% and 82.47–88.67%), and fines (2.36–4.05% and 3.78–5.02%) for Nnewi and Nnobi respectively. The cohesion and internal friction angle values range from 1–5 to 2–5 kPa and from 29–38° to 30–34° for Nnewi and Nnobi respectively, which suggests that the soils have low shear strength and are susceptible to shear failure. The plasticity index (PI) of the fines showed that they are nonplastic to low plastic soils and highly liquefiable with values ranging from 0–10 to 0–9% for Nnewi and Nnobi respectively. Slope stability analysis gave factor of safety (FoS) values in the range of 0.50–0.76 and 0.82–0.95 for saturated condition and 0.73–0.98 and 0.87–1.04 for unsaturated condition for both Nnewi and Nnobi respectively indicating that the slopes are generally unstable to critically stable. The erosion expansion rate analysis for a fifteen-year period (2005–2020) revealed an average longitudinal expansion rate of 36.05 m/yr and 10.76 m/yr for Nnewi and Nnobi gullies respectively. The soil erodibility factor (K) are 8.57 × 10−2 and 1.62 × 10−4 for Nnewi and Nnobi respectively indicating that the soils in Nnewi have higher erodibility potentials than those of Nnobi. Conclusively, the Nnewi area is more prone to erosion than the Nnobi area.

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Section: Coefficient Of Permeabilitysupporting

confidence: 83%

Comparative analysis of the expansion rate and soil erodibility factor of some gullies in Nnewi and Nnobi, Southeastern Nigeria

Nzereogu,

Igwe,

Emeh

et al. 2023

Sci Rep

Self Cite

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show abstract

“…As the presented research indicate and, among others, research by Rajak et al [57], the addition of fly ash increases the shear strength of natural soils. They stated that the factor of safety of a 37° slope, obtained from calculations in the FLAC/Slope program, increased with the increase in Numerous publications (among others: [22,[51][52][53][54][55][56]) indicate that the problem of slope stability in industrial waste landfills is an important engineering issue. The results of tests on shear strength parameters of materials stored there are often carried out either at low values of their moisture content or at optimum moisture content and indicate that these materials usually have high values of shear strength parameters, although the height of the slopes or their too-steep inclination are the reason why they are destroyed (a landslide occurs).…”

Section: Results Of Stability Calculationsmentioning

confidence: 99%

Shear Strength of Industrial Wastes and Their Mixtures and Stability of Embankments Made of These Materials

Gruchot¹,

Zydroń²

2019

Applied Sciences

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The paper presents the results of research on the influence of compaction on the shear strength of fly ash, unburnt and burnt coal wastes, and a composite (a mixture of unburnt coal waste and 30% of fly ash). The tests were carried out in a triaxial compression apparatus on samples with a diameter and height of 10 and 20 cm, respectively. In order to verify usability of the tested waste materials for earthworks, stability calculations of the road embankment made of these materials were carried out. It was shown that the tested materials were characterized by high values of shear strength parameters, which significantly depended on compaction. The most favorable values of the angle of internal friction and cohesion were obtained for the burnt coal waste, slightly lower for the composite, and the lowest for the fly ash. Stability calculations for the road embankment model showed that the slope inclination and the load on the embankment have a significant influence on the factor of safety. It was also shown that a decrease in cohesion causes significant decrease in the factor of safety. The tests and the stability calculations showed that the tested waste materials are useful for earth construction purposes.

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“…Most of the studies are focused on the evaluation of the stability of the dump slope, but few studies focus on the landslides or debris flow of the dump. For the evaluation of the safety stability of waste dumps, the mostly used methods are the limit equilibrium analysis techniques [1][2][3][4]. Due to the action by selfweight, external loads, earthquake, water, and environmental effect, the stability of the waste dump can be significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

3D Numerical Simulation of Landslides for the Full High Waste Dump Using SPH Method

Cao

Feng

Tao

2021

Advances in Civil Engineering

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Waste dump that is generally composed of a large number of loose geotechnical materials is prone to landslides under external loads. In this work, the smoothed particle hydrodynamics (SPH) method combined with the Mohr–Coulomb model is used to study the dynamic characteristics of the landslides that occurred in the waste dump during the failure process. A benchmark test is firstly conducted to verify the effectiveness of the SPH model. Then, taking the Nanfen full high waste dump with a vertical drop of 300 m in Benxi City, China, as an example, the most dangerous section is selected to establish the SPH numerical model for the waste dump landslides, and the overall dynamic process of the landslides is simulated. The simulation results show that the particles in the middle and upper of the slope have larger potential energy, and their sliding distance is larger. On the contrary, the sliding distance of particles in the lower of the slope is smaller. The particles' sliding distance decreases as the depth increases in the vertical direction of both shoulder and middle of the slope. The particles undergo a process of first acceleration and then deceleration. The sliding distance is in good agreement with the field survey result, and the landslides profile is basically consistent with the actual one. The sensitivity analysis of different particle numbers shows that the number of particles has little effect on the numerical results. The SPH method can vividly reproduce the dynamic process of the landslides in the full high waste dump. The evaluation of the sliding characteristics and risk impact range can provide the key parameters and basis for the prevention and control of the landslides in the full high waste dump and ensure the safety of the mine life cycle.

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Slope stability analysis of mine waste dumps at a mine site in Southeastern Nigeria

Cited by 32 publications

References 38 publications

Comparative analysis of the expansion rate and soil erodibility factor of some gullies in Nnewi and Nnobi, Southeastern Nigeria

Comparative analysis of the expansion rate and soil erodibility factor of some gullies in Nnewi and Nnobi, Southeastern Nigeria

Shear Strength of Industrial Wastes and Their Mixtures and Stability of Embankments Made of These Materials

3D Numerical Simulation of Landslides for the Full High Waste Dump Using SPH Method

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