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Results 21 - 30 of 39
2/1/2003 - Conference papersThis paper reports on an extensive series of short-encapsulation pull tests that were conducted in the NIOSH Mine Safety Research Laboratory and operating mines in WV and PA.
Injury data show a dramatic reduction in roof skin injuries when screening is used. Five case studies in which roof screen was used are presented along with the costs of materials, impact on bolting advance rates, and potential ergonomic risks.
8/1/2002 - Conference papersDespite its potential importance, there is no widely accepted anchorage test for fully grouted roof bolts. Recent studies using short encapsulation pull tests are described.
8/1/2002 - Conference papersThe story of how roof bolting was implemented by the mining industry, but took so long to live up to its promise, is a fascinating example of the interaction between economics, technology, regulation, and science. It still has important lessons for today.
4/1/2002 - Conference papersResearchers have conducted a large number of experiments on cable bolts to determine their load characteristics for different grout types, grout ratios, and cable configurations (Garford bulb, buttons, birdcage, nut cage, etc.)
The main theme of this video is how to work safely AND efficiently.
Instrumented cable bolts developed at NIOSH's Spokane Research Laboratory were used in conjunction with existing ground control systems to monitor rock mass loads at Tg Soda Ash's trona mine in Granger, WY.
Updating the NIOSH Support Technology Optimization Program (STOP) With New Support Technologies and Additional Design FeaturesThe Support Technology Optimization Program (STOP) was updated to Version 2.3. This paper describes the additional features: including uncontrolled convergence into the design requirements for standing roof supports; the addition of design procedures fo...
NIOSH researchers installed 39 instrumented, fully grouted bolts at six test sites in a trona mine retreat panel to study mine roof stability for the improvement of workplace safety.
6/1/2001 - Conference papersA study is described where information was collected at 37 coal mines on roof falls and other geotechnical, mining, geologic, and roof bolting factors. A statistical analysis was conducted on the data with roof fall rate as the outcome variable.