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

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Abstract

This paper presents results on the stability of slopes of the mine tailing dumps at Enyigba, Southeastern Nigeria. The geotechnical parameters of the slopes were investigated, and stability analysis was carried out with GeoStudio® 2012 developed by Geoslope International Limited. The slope materials were composed of gravel (1.42–30.13%), sand (15.94–33.34%), silt (9.75–26.87%) and clay (32.1–56.25%). The materials have LL, PL and PI ranging from 24 to 49%, 24 to 35% and 9 to 26% respectively, signifying low to medium plastic materials. These results agree with the soil low permeability (10−4 – 10−8 cm/s) recorded. The MDD and OMC of the material ranged from 1.86 to 2.22 g/cm3 and 13.45 to 17.05%, while cohesion and internal friction angle were recorded to be 13–34 kN/m2 and 8–37° respectively; implying moderately durable materials capable of slip and shear failures. XRD confirmed the presence of swelling mineral (illite) in soil material, hinting at clay plasticity on absorption of moisture, which is one of the factors influencing all forms of mass wasting. The slopes’ computed factor of safety ranged from 0.8 to 1.33, suggesting critical to poor slope stability when exposed to landslide triggering agents. Hence, slope stabilization is required on the mine tailing dumps at Enyigba to prevent major landslide occurrence.

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Acknowledgments

The authors sincerely acknowledge the lecturers of Geology department, University of Nigeria, Nsukka; particularly Dr. Ifeanyi Oha and my senior colleagues- Raphael Maduka, Kelvin Una and Uche Chukwura who have contributed wisely to the success of this research work. Special thanks also go to my father, Rev. Chukwu and my entire family for their financial support. Thank you.

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  1. Department of Geology, University of Nigeria, Nsukka, Nigeria

    Ogbonnaya Igwe & Chidinma Chukwu

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  1. Ogbonnaya Igwe
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Correspondence to Chidinma Chukwu.

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Igwe, O., Chukwu, C. Slope stability analysis of mine waste dumps at a mine site in Southeastern Nigeria. Bull Eng Geol Environ 78, 2503–2517 (2019). https://doi.org/10.1007/s10064-018-1304-8

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