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Permanent link (DOI): https://doi.org/10.7939/R3HD0N

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Scale Prediction of Crush Rock Shovel Pad Stability Open Access

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Other title
Subject/Keyword
Cyclic plate load test
CBR test
Shovel pad stability
Crushed limestone
Haul road design
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Shi,Enjia
Supervisor and department
Timothy G, Joseph (Civil and Environmental Engineering)
Examining committee member and department
Timothy G, Joseph (Civil and Environmental Engineering)
Yasher Pourrahimian (Civil and Environmental Engineering)
Yasser Mohamed (Civil and Environmental Engineering)
Ming Lu (Civil and Environmental Engineering)
Department
Department of Civil and Environmental Engineering
Specialization
Mining Engineering
Date accepted
2014-11-06T11:55:25Z
Graduation date
2015-06
Degree
Master of Science
Degree level
Master's
Abstract
Adverse mining equipment motions give rise to ground deterioration and poor ground conditions will in turn aggravate equipment structural damage as a result of enhanced detrimental motions of the equipment. Costs for correcting equipment fatigue failures are tremendous. Consideration of a suitable mining or operating surface material to improve ground conditions through knowledge of material performance under equipment cyclic loading leads to better mine operating surface designs, lower maintenance costs and more reasonable operational strategies. In investigating the performance of crushed limestone as a potential enhancing ground material under shovel tracks during shovel duty cycles, a shovel-ground equilibrium has been analysed to determine ground pressures under shovel tracks. Cyclic plate load tests were conducted to develop an overall view of crushed limestone behavior under cyclic loading. A relationship between pressure stiffness and plate shape was discerned with respect to initial loading, which provides a reference for tracked-equipment manufactures for track design. For cyclic loading conditions during excavating operations, resilient stiffness was shown to be consistent with the stress-deformation response displayed by the more conventional CBR test. Therefore, CBR may be applied to approximate the resilient stiffness of crushed limestone. A correlation between total deformation and the number of cycles was established for different plate aspect ratios and stress levels. The last stage of this study combined the shovel loading cycles and material performance together to estimate the ground deformation as duty cycles increase to optimize a shovel operational duration in a single location. The CBR test was performed to verify the applicability of the crushed limestone as a cap material in a multi-layer haul road on weak in-situ material.
Language
English
DOI
doi:10.7939/R3HD0N
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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