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Results 81 - 90 of 128
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.
More that 700 microseismic emissions were collected from two underground limestone mine roof fall areas in southwestern PA. Results reveal much about the behavior of strata prone to failure and allow for the construction of hazard maps.
Field studies were conducted to record electromagnetic (EM) emissions at the Galena Mine, Wallace, Idaho. The goal of the research was to determine if EM emissions were valid precursors to imminent ground failure.
Underground 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.
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.
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.