Modify Selection
- Hazards and exposures:
- Roof falls
- Document types:
- Conference papers
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Results 11 - 20 of 48
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7/1/2008 - Conference papersThis paper describes a case study where a surface-based microseismic system, using triaxial geophones in boreholes drilled from the surface, was deployed at a large limestone mine.
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1/1/2008 - Conference papersNIOSH researchers collected basic data from two blast rounds at the SSX-Steer Mine as a component of a larger study on controlled blasting, the goal of which is to reduce injuries from falling rocks in underground mines.
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2/1/2007 - Conference papersThe goal of this study was to review periods of elevated microseismic activity and determine whether fracture activity rate can be used to anticipate roof falls. The results showed that limited success would be achieved by such a system.
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8/1/2006 - Conference papersNIOSH conducted an evaluation of screen materials commonly used in U.S. coal mines to determine their support characteristics and identify the parameters that could affect their performance with respect to controlling the fall of rock from the roof.
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8/1/2006 - Conference papersNIOSH conducted wet/dry immersion cycling of clay-rich rocks, which provides an accurate, quick and inexpensive method for estimating the moisture sensitivity of mudrocks. With this information mine operators can begin to anticipate hazardous ground.
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8/1/2006 - Conference papersThe Roof Fall Risk Index helps the underground stone mine operator to assess defects of the mine strata and rate the relative roof fall risk these defects pose. This paper shows how the defect information is collected and methods to analyze the data.
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3/27/2006 - Conference papersA methodology to assess the risk for a roof fall is proposed in a preliminary fashion based on engineering judgment acquired from extensive underground stone mine experience and examination of related literature.
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8/1/2005 - Conference papersMonitoring technology and techniques can provide a means to warn of hazardous roof fall conditions. Measuring roof deflection is the most common method of detecting roof instabilities.
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8/1/2005 - Conference papersThe objective of this work was to determine if GPR could be used to help assess the mine roof conditions near the No. 4 Portal area of the NIOSH Lake Lynn Experimental Mine (LLEM).
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6/1/2005 - Conference papersThis study used microseismic emissions to help identify three local rock failure processes. It was also shown that analysis of microseismic emissions can aid in assessing the degree of instability associated with these local rock failure processes.
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Content source: National Institute for Occupational Safety and Health, Mining Program