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Design of Underground Mine Structures to Resist Roof-fall Impact Loadings.

Allwes-RA; Mangelsdorf-CP
Paper in Rock Support in Mining & Underground Construction Balkema PP 565-572 :565-572
The U.S. Bureau of Mines paper presents the results of structural analyses and full-scale tests conducted on a steel-set arch and tri- set. This purpose of this work was to evaluate the suitability of using these structures in roof-fall areas. Theoretical resistance functions were established for both structures and were representative of their experimental behavior. The resistance functions were used to determine the energy absorption capacity of the structures and to predict their response to impact loading. The dynamic tests demonstrated that the arch canopy design procedure developed by the Bureau is appropriate for tri-sets and yields conservative designs for both steel-set arches and tri-sets. As a result of this work, it is recommended that these two structures may be considered for use in roof-fall-prone areas and for rehabilitation work, provided that the arch canopy design procedure is utilized for each application and that the principles underlying the design procedure are understood.
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OP 172-92
NIOSH Division
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Paper in Rock Support in Mining & Underground Construction. Balkema, PP. 565-572