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Block model approach for analysis of rock bench stability in open pit mines
Asof, Marwan1, Nurly Gofar2.
Wedge failure analysis conventionally adopted for the design of global angle of open
pit mines is not always applicable when the area consists of jointed rock benches. In this
analysis, the unstable wedge is assumed intact while, in fact, the rock bench consists of an
assemblage of blocks generated by the intersections of well-defined discontinuities. Block
model approach adopted in Resoblok provides an alternative solution for the design and stability
analysis of a rock bench. The model analyzes the stability of individual block by limit
equilibrium method while the discontinuity aspect is considered statistically based on
geometrical modelling of the individual fractured rock mass. This paper presents the stability
analysis of five rock benches from two mining sites. The analysis shows that Resoblok model
provides a good indication of the distribution, the number and the volume of unstable blocks;
therefore, it is useful for the design of open pit mines. The result of this study is in good
agreement with field observation.
Affiliation:
- Sriwijaya University, Indonesia
- Universiti Teknologi Malaysia, Malaysia
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