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Stability analysis and design of cemented backfill wall for underground hard-rock mines using numerical modelling


Affiliations
1 Hindustan Zinc Limited, Dariba, Rajsamand 313 211, India
2 CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, 17/C, Telankhedi, Civil Lines, Nagpur 440 001, India
 

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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  • Stability analysis and design of cemented backfill wall for underground hard-rock mines using numerical modelling

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Authors

Ashok Kumar Godugu
Hindustan Zinc Limited, Dariba, Rajsamand 313 211, India
Sreenath Sekhar
CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, 17/C, Telankhedi, Civil Lines, Nagpur 440 001, India
John Loui Porathur
CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, 17/C, Telankhedi, Civil Lines, Nagpur 440 001, India
Shubham Bhargava
CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, 17/C, Telankhedi, Civil Lines, Nagpur 440 001, India

Abstract


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

References





DOI: https://doi.org/10.18520/cs%2Fv121%2Fi7%2F920-928