Gate road layout design for two-seam longwall mining |
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| Authors: | H N Maleki J F T Agapito M Wangsgard J Cort |
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| Institution: | (1) J. F. T. Agapito and Associates, Inc., 715 Horizon Drive, Suite 340, 81506 Grand Junction, Colorado, USA;(2) Plateau Mining Company, PO Box PMC, 84501 Price, Utah, USA |
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| Abstract: | Summary Results of instrumentation, test mining and computer aided stability analyses were combined to design the most stable gate road layout for two-seam longwall mining at the Plateau Mining Company. Five layouts were evaluated; these layouts used a combination of yield and/or large pillars with either three-entry or two-entry development systems.A layout which used a yield pillar within a two-entry development system resulted in the most stable gate roads for two-seam mining. Another layout using a yield and large pillar was shown to be most stable for single-seam mining of the top seam, but it was unsuitable for two-seam mining because of seam interaction problems.The size of the yield pillar was determined by satisfying several design requirements, as well as by limited test mining; test results showed good, medium-term stability for the yield pillars, with a possible need for rib control. It was shown that the yield pillars might be effective in controlling the floor heave, and could minimize interaction problems in two-seam mining. |
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| Keywords: | Layout design yield pillars longwall two-seam mining stability analysis |
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