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Results 71 - 80 of 123
Results show that the remnant upper seam structure's size can influence multiple seam interaction. Specifically, smaller critically loaded upper seam pillars appear more likely to cause lower seam ground control problems than wider pillars.
Monitoring 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.
The 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).
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.
This 7-minute video with instructional material shows how well roof screen keeps loose rock from falling in difficult roof conditions.
3/1/2005 - Technology NewsMost rock fall injuries can be prevented by installing roof screen during the bolting cycle. This video and accompanying instruction booklet explain techniques for roof screen installation and use of the personal bolter screen. The video also provides s...
Application of Ground Penetrating Radar to Evaluate the Extent of Polyurethane Grout Infiltration for Mine Roof Control: A Case StudyThe study tested ground penetrating radar's ability to determine the extent of grout penetration into mine roof strata in the NIOSH Safety Research Coal Mine. The study showed that GPR technology can be useful in detecting roof changes due to grout.
Technology News 506 - The Sky is Falling!: NIOSH Releases Safety Video for Surface Mining Operations8/1/2004 - Technology NewsInvestigators collaborated to develop a new training module that would address the hazards of working around highwalls. Such a module would be applicable to surface mines and road construction sites, both of which require personnel to work under and on ...
Polyurethane injection is a proven method of rock stabilization in even the weakest, most broken ground. Optimization of the injection design by pre-injection video diagnostics can greatly contribute to successful and efficient roof stabilization.
Mines with low-strength roof are much more likely to struggle with roof falls. This paper focuses on two mines in two different seams, conducting statistical analysis to determine which support combinations have proven to be most effective.