Effects of abandoned underground workings on open pit slope stability
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Authors
Rehwoldt, Eric Bruce
Issue Date
1989
Type
Thesis
Language
en_US
Keywords
limit equilibrium , stress-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
Alternative Title
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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Citation
Publisher
University of Nevada, Reno
License
In Copyright(All Rights Reserved)