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Stress Distribution Around Resin-grouted Bolts.
MISSING :39 pages
Ninety-seven roof bolts were instrumented with strain gages and resin-grouted in three areas of the Bear Coal Mine, Somerset, Colorado, By the Bureau of Mines. Measurements taken with these instruments indicate roof support is achieved through a combination of point suspension and resistance to vertical and horizontal stresses caused by localized shearing in the roof. The localized shearing results in bending of the bolts, yielding due to high vertical stresses, and the transfer of high loads to the bolt head or plate.
IH; Report of Investigations
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division