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Results 91 - 100 of 201
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Using Major Hazard Risk Assessment to Appraise and Manage Escapeway Instability Issues: A Case Study7/1/2007 - Conference papersMajor Hazard Risk Assessment is a process that identifies the characteristics of major hazards, ranks their risk, and evaluates controls to mitigate them. This approach was used at an underground mine with fire hazard and strata instability issues.
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7/1/2007 - Conference papersA unique circumstance created by monitoring a pre-driven longwall recovery room permitted measuring the stresses of a coal pillar throughout its entire life cycle in less than a week. The complete transformation took place in less than 12 hours.
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7/1/2007 - Conference papersA cooperative study was conducted to evaluate the effectiveness of (partially) pre-driven longwall recovery rooms supported with pumpable roof supports.
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7/1/2007 - Conference papersObservations of pillar conditions in limestone mines showed that the presence of weak bands in the limestone can result in pillar damage. This study investigated the mechanism of failure caused by the presence of weak bands using numerical models.
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7/1/2007 - Conference papersNumerical modeling is used to evaluate the degree the pillar strength is increased with a rectangular pillar over a square pillar.
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5/1/2007 - Conference papers, Information CircularsA detailed evaluation of the multiple-seam experiences at Harris No. 1 Mine was done as part of NIOSH's nationwide multiple-seam mining case history database.
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Multiple-seam interactions are a major ground control hazard in many U.S. underground coal mines. NIOSH has been conducting research to develop better techniques for predicting the location and severity of multiple-seam interactions.
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5/1/2007 - Conference papersA survey of roof and pillar conditions in limestone mines has revealed that bench mining of the floor between pillars can cause instability in the pillars at the perimeter of the benched area. Numerical models were used to assess those effects.
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2/1/2007 - Conference papersMethane can be a significant hazard in coal mine longwalling operations and extensive methane mitigation techniques are employed by coal mine operators. Reservoir modeling techniques are used to better understand the liberation and migration of methane ...
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1/1/2007 - Peer reviewed journal articlesSome of the issues affecting pillar strength at low width-to-height ratios in hard, brittle rock are investigated. The results showed that the strength of slender pillars is more variable than that of wider pillars.
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Content source: National Institute for Occupational Safety and Health, Mining Program