Numerical Analysis of Sill and Crown Pillar Stability for Multilevel Cut and Fill Stopes in Different Geomining Conditions

A steeply dipping orebody, having decreasing width with depth has been modeled considering horizontal cut and fill method of stoping at four different depth levels. The focus of the study is to identify and understand the behavior of crown and sill pillars in terms of varying stress and geo-mining c...

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Bibliographic Details
Published in:Geotechnical and geological engineering 2016-04, Vol.34 (2), p.529-549
Main Authors: Kumar, Hemant, Deb, Debasis, Chakravarty, Debashish
Format: Article
Language:English
Subjects:
Civil Engineering
Compressive strength
Crown pillars
Dredging
Earth and Environmental Science
Earth Sciences
Elasticity
Excavation
Finite element method
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Mathematical analysis
Mathematical models
Modulus of elasticity
Numerical analysis
Original Paper
Plane strain
Rock masses
Stability
Stability analysis
Stoping
Stress concentration
Terrestrial Pollution
Thickness
Waste Management/Waste Technology
Yields
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Summary:A steeply dipping orebody, having decreasing width with depth has been modeled considering horizontal cut and fill method of stoping at four different depth levels. The focus of the study is to identify and understand the behavior of crown and sill pillars in terms of varying stress and geo-mining conditions without reinforcement using finite element method. Analysis of stresses, displacements and extent of yield zones around the excavation is carried out by varying the rock mass conditions such as geological strength index, uniaxial compressive strength ( UCS or σ ci ), modulus of elasticity ( E ), and thickness of crown and sill pillars ( T ). These analyses have been conducted based on 135 non-linear numerical models considering Drucker–Prager material model in plane strain condition. Results of the study provide valuable insight into the stress concentration factors of the pillars highlighting stress distributions, roof convergence, yield zones and support requirements. Finally, it suggests the optimum thickness of crown and sill pillar with varying thickness of orebody.
ISSN:0960-3182
1573-1529
DOI:10.1007/s10706-015-9964-7