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Span design for entry-type excavations Lang, Brennan Davis Allan
Abstract
Underground entry-type excavations require higher factors of safety than do non-entry excavations yet not as high as those required for permanent underground structures. A review is made of underground excavation span design techniques and the conditions under which they can be applied. Shortcomings of these existing methods, as they are applied to cut and fill stopes and other entry-type excavations, are highlighted. A design procedure specific to conditions found in entry-type mining is proposed. At the centre of the procedure is an empirical span design chart, called the “Stability Graph for Entry-Type Excavations”, which provides a practical tool for mining engineers to design stable entry-type excavations. The development of this chart and its use as a design tool is a result of the statistical analysis of 172 stoping case histories collected at a large underground gold mine in northern Ontario, The influence of artificial support in maintaining stability and increasing span is investigated. A report is given of a trial support program carried out at the same operation using a concentrated pattern of cable bolts to replace a post pillar in order to increase span.
Item Metadata
Title |
Span design for entry-type excavations
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1994
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Description |
Underground entry-type excavations require higher factors of safety than do non-entry excavations
yet not as high as those required for permanent underground structures. A review is made of underground
excavation span design techniques and the conditions under which they can be applied. Shortcomings of
these existing methods, as they are applied to cut and fill stopes and other entry-type excavations, are
highlighted.
A design procedure specific to conditions found in entry-type mining is proposed. At the centre of
the procedure is an empirical span design chart, called the “Stability Graph for Entry-Type Excavations”,
which provides a practical tool for mining engineers to design stable entry-type excavations. The
development of this chart and its use as a design tool is a result of the statistical analysis of 172 stoping
case histories collected at a large underground gold mine in northern Ontario,
The influence of artificial support in maintaining stability and increasing span is investigated. A
report is given of a trial support program carried out at the same operation using a concentrated pattern of
cable bolts to replace a post pillar in order to increase span.
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Extent |
8504984 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-05
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0081176
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1994-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.