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Results 341 - 350 of 646
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8/1/2004 - Conference papersA new generation of hydraulic mine support prestressing devices has been developed. This paper examines the performance capabilities of these inflatable prestressing units and the impact they have on the performance of various support systems.
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8/1/2004 - Conference papersUnderground limestone mine roofs in Northern Appalachia can be subject to high horizontal stresses. A case study is presented showing that induced stress changes in the immediate roof are less likely if the pillars contain weak bedding planes.
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6/1/2004 - Conference papersAs part of a research program to reduce injuries and fatalities in the U.S. mining workforce, NIOSH is investigating the potential use of noncontact vibration measurements to identify hazardous ground fall conditions.
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6/1/2004 - Conference papersNIOSH researchers have identified a pattern of fracture zone development as an explanation for fracture formation around rectangular openings in underground mines. Two computer modeling codes were used to model different aspects of this pattern.
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5/1/2004 - Conference papersThis paper describes a project involving modeling rock masses with varying Rock Mass Rating (RMR) values to determine the degree of instability that develops around an underground opening as a function of RMR.
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5/1/2004 - Conference papersDescribes the results of a case study where NIOSH demonstrates that significant increases in total mine airflow can be achieved and the ventilation improved in a large-opening stone mine by replacing an axial-vane mine fan with two 12-ft diameter propel...
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5/1/2004 - Conference papersDiscusses implementation of a real-time neural network which can discriminate mine fires from nuisance diesel emissions as part of an atmospheric mine monitoring system in NIOSH's Safety Research Coal Mine.
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5/1/2004 - Conference papersResearchers are investigating the causes and mechanisms of roof failure in underground mines with the goal that better understanding these issues will lead to better layout and support designs to help prevent fall-of-ground accidents and fatalities.
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5/1/2004 - Conference papersThis study describes how response times of machine-mounted methane monitors were measured by placing the methane sensor heads in a specially designed box where they were exposed to an atmosphere containing a constant concentration of methane.
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5/1/2004 - Conference papersDescribes a computer program developed by NIOSH for estimating the air quantity needed to dilute diesel particulate matter in underground large opening mines.
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Content source: National Institute for Occupational Safety and Health, Mining Program