1787 A Limit Equilibrium Approach to the Use of Stability Bunds for the Design of a HDPE-lined Tailings Storage Facility
DOI:
https://doi.org/10.17159/Abstract
The addition of a HDPE-liner between the waste body of a Tailings Storage Facility (TSFs) and the natural ground (NG) creates an interface between, inter alia, the liner and surrounding soils on the footprint of the TSF. It is known that low strength materials beneath slopes can cause slope instability. One method, which can theoretically mitigate this instability of a lined TSF, is the addition of stability bunds along the footprint of the TSF. Altering the profile of the footprint to include slope changes, which directly opposes the direction of the failure, creates passive slices in a limit equilibrium analysis. The passive slices actively oppose the movement of active slices, resisting the mobilisation of tailings and resulting in greater active slice forces required to develop a failure surface running along the liner interface. Two scenarios are presented and compared. The first scenario retains the ground profile unaltered and the second scenario includes stability bunds along the ground profile. An in-depth assessment is made on the interslice forces and the interface shear stresses for the defined scenarios. The theoretical background is discussed in greater detail to determine the mechanisms of reinforcement of the bunds.
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Copyright (c) 2025 Jean Derek Visagie, Tian Bezuidenhout
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