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Results 1 - 10 of 39
12/11/2020 - PC softwareA factor of safety calculator for an underground mining excavation’s ground support design.
8/1/2004 - Conference papersThis paper focuses on a computer simulation used to model roof behavior and rock bolt interaction in a collaborative study of ground behavior, reinforcement performance, and stress redistribution in a coal mine entry under severe horizontal stress.
8/1/2001 - Conference papersA statistical study of roof bolt performance was conducted in 37 U.S. mines. Analysis of the results led to guidelines for making preliminary estimates for bolt length, capacity, and pattern to improve roof stability in difficult conditions.
10/1/2000 - Information CircularsThe proceedings provide information on several new technologies including guidelines for roof bolt length, pattern, and capacity; a new design method for longwall tailgate supports; and a technique for measuring loads developed within cable bolts.
Ground Response to High Horizontal Stresses During Longwall Retreat and its Implications for Longwall Headgate Support2/19/2019 - Peer reviewed journal articlesAn article discussing roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary.
1/1/2016 - Peer reviewed journal articlesAn article describing cable bolting solutions at two low-seam coal mines in similar ground conditions. Two original cable bolt based support systems and two modified systems are evaluated to estimate their ability to prevent large roof falls.
8/18/2015 - News and announcementsA feature story about through-the-earth communcations technologies available for mine emergencies.
8/20/2013 - PC softwareA software program to help select roof bolts for primary support in underground coal mines
Technology News 532 - Collapsible Drill Steel Enclosure for Reducing Roof Bolting Machine Drilling Noise9/1/2008 - Technology NewsResearch conducted by NIOSH has focused on producing noise treatments to reduce noise generated by the Roof Bolting Machine. A drill steel enclosure for reducing roof bolting machine drilling noise has been developed as an engineering control.
10/1/2007 - Conference papersThis paper discusses the methods NIOSH used to identify noise sources on a roof bolting machine while drilling.