Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content

Mining Publication: A Method for the Selection of Rock Support Based on Bolt Loading Measurements

NOTE: This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.

Original creation date: August 1997

Image of publication A Method for the Selection of Rock Support Based on Bolt Loading Measurements

A method to assist in the evaluation and selection of roof bolts using in situ measurements of roof bolt loading has been developed by researchers of the Spokane Research Center, National Institute for Occupational Safety and Health. Both axial and bending forces are measured by strain gauges at many locations along the length of fully grouted bolts during various stages of mining. This information is then used to (1) predict bolt loading for variations in bolt spacing, grade, and diameter, (2) calculate the design changes necessary in zones where bending loads are high, and (3) determine if bolt length is adequate. Results from several case studies of full-column bolt loading in coal mine gate roads are use to illustrate the design method. This knowledge will give design engineers a tool for the selection of roof support systems that will improve underground safety by reducing roofbolt failures.

Authors: SP Signer, D Cox, JL Johnston

Conference Paper - August 1997

NIOSHTIC2 Number: 20024501

Proceedings of the 16th International Conference on Ground Control in Mining, Peng SS, ed., Morgantown, West Virginia: West Virginia University, 1997 Aug; :183-190