Current Science

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A methodology using three-dimensional elasto-plastic analysis has been formulated to assess the required strength parameters for a stable backfill wall for various dimensions of a stope. The numerical modelling results show linearly increasing trend for the required backfill cohesion with respect to stope height for longer stopes and curvilinear with flattening trend for shorter stopes. Comparison of the numerical modelling results with those of a popular theoretical equation shows that the theoretical equation fails to represent the interface friction and tension. The numerical modelling methodology is a better tool which can capture a gamut of aspects. The developed methodology has been used to estimate the required pastefill strength and binder percentage for a hard rock mine in North India, where it has been successfully implemented in over 50 stopes without any significant case of backfill failure

Keywords

Elasto-plastic analysis, field implementation, hard-rock mining, numerical modelling, pastefill
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