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ETD RECORD
Design of cemented rockfill spans for longhole stoping at the Rain Mine, Carlin, Nevada
Citation
Kockler, Mark.. (2007). Design of cemented rockfill spans for longhole stoping at the Rain Mine, Carlin, Nevada. Theses and Dissertations Collection, University of Idaho Library Digital Collections. https://www.lib.uidaho.edu/digital/etd/items/etd_23.html
- Title:
- Design of cemented rockfill spans for longhole stoping at the Rain Mine, Carlin, Nevada
- Author:
- Kockler, Mark.
- Date:
- 2007
- Keywords:
- Concrete mine supports--Design and construction Mineral industries--Nevada--Carlin Stoping (Mining)
- Program:
- Mining Engineering
- Abstract:
- A study of the maximum CRF span that could be achieved in the 5850 Stoping Block at the Rain Mine in Nevada has indicated a maximum estimated span of 35 ft. The results are based on the combination of field data, laboratory testing, and numerical modeling.;Three design charts are developed to estimate the maximum CRF span for three CRF span scenarios: single beam, two beam no gap, and two beam with a gap. Input factors for the charts are CRF field unconfined compressive strength and vertical load. The field unconfined compressive strength is calculated as 75% of the unconfined compressive strength measured in the laboratory. Estimation of the vertical load is a complex problem and requires an understanding of the in-situ vertical and horizontal stresses, rock mass properties, and how the surrounding rock mass transfers stress. Applying the field CRF strength and the estimated vertical stress to the appropriate chart, a span-to-depth ratio is determined. Multiplying the span-to-depth ratio by the depth or vertical thickness of the bottom level of CRF, the maximum span is calculated.;The maximum span for any number of CRF beams is limited to the maximum allowable span of the bottom beam. Based on the aggregate material and the water-to-cement ratio utilized at the Rain Mine, the maximum stable span for a vertical load of only beam self weight is estimated at 60 ft for a 10-ft. thick level of CRF or a span-to-depth ratio of 6.
- Description:
- Thesis (Ph. D., Mining Engineering-Metallurgy)--University of Idaho, May 2007.
- Major Professor:
- S.J. Jung.
- Type:
- Text
- Format Original:
- xiii, 310 leaves :col. ill., col. maps ;29 cm.
- Format:
- record
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