Authors: Wu, YK; Gagnon, R


Cite As:
Wu, YK & Gagnon, R 2012, 'Use of Yield-Lok bolts as conveyor belt hanging system in seismic areas', in Y Potvin (ed.), Deep Mining 2012: Proceedings of the Sixth International Seminar on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 117-125,

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This paper introduces the use of Yield-Lok bolts as hanging conveyor belt system in Barrick Gold’s Pascua-Lama Project in Chile, in considering the dynamic loads resulting from earth quake seismicity. A 4 km tunnel and hanging conveyor belt system are in construction in the seismically active area between Chile and Argentina. In addition to the static load of the conveyor belt and material live weights, seismic loading resulting from an earth quake is considered in the design of hanging system with 50 years of service life. Dynamic yielding bolts are therefore employed to prevent the conveyor belt from falling to the ground. Based on results from a series of pull tests on site and dynamic tests in laboratory, Yield-Lok bolt developed by Jennmar has been selected as the dynamic yielding hanging system due to its consistent performance and high capacity of energy absorption. In this paper, the tunnel project and ground conditions are introduced; the design criteria of the dynamic yielding hanging system is discussed; and results of site pull tests and laboratory drop tests with the Yield-Lok bolts are presented.

ASTM D7401-08 (2008) Standard Test Methods for Laboratory Determination Of Rock Anchor Capacities By Pull And Drop Tests.
Haven, S. and Ozbay, U. (2009) In-situ Testing of Roofex Yielding Rock Bolts in Coal Ribs, 28th International Conference on Ground Control in Mining, Morgantown, WV, USA, 28–30 July 2009, pp. 181–186.
Varden, R., Lachenicht, R., Player, J., Thompson, A. and Villaescusa, E. (2008) Development and Implementation of the Garford Dynamic Bolt at the Kanowna Belle Mine, Tenth Underground Operators’ Conference, Launceston, TAS, 14–16 April 2008, pp. 95–102.
WIPO (2011) World Intellectual Property Organization, Patent Publication No. WO201102879 on Yielding Bolt and Assembly, viewed 24 November 2011, .
Wu, Y. and Oldsen, J. (2010) Development of a new yielding rock support – Yield-Lok bolt, 44th U.S. Rock Mechanics Symposium, June 27–30, 2010, Salt Lake City, Utah.

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