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Effects of abandoned underground workings on open pit slope stability
Date
1989Type
ThesisDepartment
Geological Sciences and Engineering
Degree Level
Master's Degree
Degree Name
Geological Engineering
Abstract
Limit equilibrium and stress-strain finite difference methods were used to assess the effect of abandoned underground workings on pit slope stability of the Northern Belle pit, Candelaria mine. Excavation into hillslopes containing networks of drifts, stopes, and adits was simulated for a site specific, as well as generalized, slope analysis. Results indicate that the presence of abandoned workings near slope face contributes to significant tensile and shear stress development within the relatively weak rock units present. Isolated bench failure, rock topples, and raveling of slopes in response to these stresses may be expected during excavation operations. Overall slope instability does not appear to be greatly affected by the known distribution of abandoned workings. Instability of overall slopes was found to be controlled primarily by fault geometry within open pit highwalls.
Description
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Permanent link
http://hdl.handle.net/11714/1637Subject
limit equilibriumstress-strain finite difference methods
abandoned underground workings
pit slot stability
Northern Belle pit
Candeleria mine
excavation
hillslopes
drifts
stopes
adits
site specific slope analysis
generalized slope analysis
slope face
tensile development
shear stress development
weak rock units
isolated bench failure
rock topples
raveling of slopes
excavation operations
slope instability
gault geometry
open pit highwalls
Mackay Science Project
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