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A CASE STUDY OF BOLT PERFORMANCE IN A TWO-ENTRY GATE ROAD (1998)

This paper presents the results of a case study conducted in a two-entry gateroad in a coal mine where excessive roof deformation and bolt loading resulted in failure of many roof supports. The instruments consisted of 16 fully grouted, strain-gaged resin bolts, load cells on both full and partially grouted cable bolts, and vertical deflection multipoint extensometers. These instruments were installed on-cycle to measure loading on bolts in an existing support pattern and to determine if cable bolts could be used to improve roof stability
Reference:
17th Conference on Ground Control in Mining, West Virginia University, August, 1998
Organization:
National Institute for Occupational Safety and Health, USA
USA
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