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Results 11 - 20 of 38
8/1/2006 - Information CircularsThis trainer's guide is designed as a reference manual. The purpose is to offer information and examples to skills trainers to assist them in structuring training for new operators of Walk-Thru roof bolting machines.
8/1/2005 - Conference papersNIOSH continues to investigate the behavior of fully grouted roof bolts in the weak roof rock of Pittsburgh's Safety Research Coal Mine. This paper describes the results of three roof bolt studies.
8/1/2004 - Conference papersMines 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.
8/1/2004 - Conference papersThe San Juan Mine and the National Institute for Occupational Safety and Health conducted a study to measure how development mining affected bolt loads.
Evaluation of Instrumented Cable Bolts in Cement Grout to Determine Physical and Numerical Modeling Properties4/1/2004 - Reports of InvestigationsNIOSH researchers at the Spokane Research Laboratory in Spokane, WA, are investigating the physical properties of cable bolts by replacing the conventional king wire with a modified king wire on which strain gauges have been installed.
This paper presents information that shows that short-encapsulation pull tests can provide the information necessary to improve ground control in variable roof conditions.
Standing crib supports have been applied in underground mining programs to resist large roof movements and sustain high-loads. The parameter that has not been examined and is not well understood is the effect that a crib or other types of standing supp...
To measure the loading behavior of friction bolts, NIOSH researchers installed strain gauges on the interior of friction bolts and developed a miniature data acquisition system (MIDAS) that fits inside the hollow portion of the friction bolt.
4/1/2003 - Technology NewsThe AHSEM computer program contains two modules to improve mine layouts for control of horizontal stress. ARBS is designed to help with selecting the proper roof bolt system from the great variety of available bolt types and patterns.
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.