Effects of monsoonal rainfall on waste dump stability and respective geo-environmental issues: a case study |
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| Authors: | Mohan Yellishetty William J Darlington |
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| Institution: | (1) Department of Civil Engineering, Monash University, Clayton, VIC, 3800, Australia |
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| Abstract: | The stability of mine waste dumps is of critical importance and an issue, the mining industry of Goa, India is continually
facing. The State of Goa receives high rainfall of around 3,000 mm annually. This heavy monsoonal rainfall is often believed
to be the cause of dump slope instability. In light of several dump collapses encountered in the State and their damaging
effects on both mine operations and local geo-environmental conditions, this paper examines their stability considering various
geotechnical factors and the downstream environmental effects of a slope failure. The mechanical properties of dump waste
material are reported at different compaction levels. The effect of these properties and changes in pore-water pressure are
specifically examined using limit equilibrium analysis. An empirical formula is developed relating dump height, material mechanical
parameters and pore-water pressure to the factor of safety of the slope. It was found that the level of compaction experienced
by the material had a significant effect on the factor of safety. |
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