Rock Pillar Design Using a Masonry Equivalent Numerical Model

In underground mining, the design of rock pillars is of crucial importance as these are structures that allow safe mining by maintaining the stability of the surrounding excavations. Pillar design is often a complex task, as it involves estimating the loads at depths and the strength of the rock mas...

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Bibliographic Details
Published in:Energies (Basel) 2021-02, Vol.14 (4), p.890
Main Authors: Moffat, Ricardo, Caceres, Cristian, Tapia, Eugenia
Format: Article
Language:English
Subjects:
Coal
Design
design numerical model
Failure modes
Finite difference method
Geometry
Masonry
Mathematical models
Mining
Numerical models
Pillar failure
Rock masses
rock pillar
Rocks
Shear strength
Shear stress
Stress analysis
Underground mining
underground stability
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Summary:In underground mining, the design of rock pillars is of crucial importance as these are structures that allow safe mining by maintaining the stability of the surrounding excavations. Pillar design is often a complex task, as it involves estimating the loads at depths and the strength of the rock mass fabric, which depend on the intact strength of the rock and the shape of the pillar in terms of the aspect ratio (width/height). The design also depends on the number, persistence, orientation, and strength of the discontinuities with respect to the orientation and magnitude of the stresses present. Solutions to this engineering problem are based on one or more of the following approaches: empirical design methods, practical experience, and/or numerical modeling. Based on the similarities between masonry structures and rock mass characteristics, an equivalent approach is proposed as the one commonly used in masonry but applied to rock pillar design. Numerical models using different geometric configurations and state of stresses are carried out using a finite difference numerical approach with an adapted masonry model applied to rocks. The results show the capability of the numerical approach to replicate common types of pillar failure modes and stability thresholds as those observed in practice.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14040890