Stability analysis of varying height waste dump in open-pit mine under particle size gradation and reconstruction effect of waste materials

ABSTRACT

This study determines the safety-stability factors of the waste dump benches at different heights and analyses the deformation law, stress variation, and crack propagation characteristics of typical slope models. The meso-mechanical parameters obtained by discrete element numerical simulation are modified through slope radar monitoring data. The results show that the critical height of the dumping benches of the studied open-pit mine is 60 ~ 70 m, and the amount of bench settlement is positively correlated with the height of the benches. After the critical height is exceeded, the bench forms a three-wedge failure due to uneven settlement.

KEYWORDS:

• Open-Pit mine
• dump bench height
• radar monitoring
• DEM
• slope stability

Acknowledgements

We would like to thank Tianchi Energy’s South Open-pit Mine for providing a research base for this work.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research was supported by the National Natural Science Foundation of China [51574222] and the Independent Research Project of the State Key Laboratory of Coal Resources and Safe Mining, CUMT [SKLCRSM001].