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A NEW ROCK BOLT CONCEPT FOR UNDERGROUND EXCAVATIONS UNDER HIGH STRESS CONDITIONS (2008)

This paper presents the preliminary results of a laboratory testing program aimed at assessing the impact energy dissipation capability of a new rock bolt. The results represent the most up to date findings at this current time. In situ field tests are still on-going and have been delayed due to issues at the various mine sites. Unfortunately, no results were available at the time writing the paper. All the dynamic tests referred to in the paper have been performed at the premises of the CANMET Mining and Mineral Sciences Laboratories (MMSL), of Natural Resources Canada, Ottawa, Canada. The rock bolt, named Roofex®, has been tested in the laboratory for static and dynamic loading conditions. Static loading tests have been performed at the Atlas Copco MAI laboratory, and a capability to accommodate more than 60 cm of displacement at the rock surface with dissipation of deformation energy of more than 50 kJ. At CANMET-MMSL, impact loadings of up to 27 kJ have been applied, with the rock bolt accommodating these impacts. The physical set up of the testing is discussed, and the loading curves are presented and analysed.
Reference:
6th International Symposium on Ground Support in Mining and Civil Engineering Construction, Edrs: T. R. Stacey and D. F. Malan
Organization:
Atlas Copco, Canada
Canada
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