Lilley, CR, Roberts, T, Putzar, G & Beck, DA 2013, 'Dynamic simulations of excavations with yielding bolts', in Y Potvin & B Brady (eds), Proceedings of the Seventh International Symposium on Ground Support in Mining and Underground Construction
, Australian Centre for Geomechanics, Perth, pp. 525-538, https://doi.org/10.36487/ACG_rep/1304_36_Lilley
We describe 3D simulations of rockbolts installed in a tunnel intersection geometry in a jointed rock mass subjected to an extreme dynamic loading event. A newly developed yielding rockbolt was simulated, using a bolt model calibrated from laboratory drop tests. The results show that most of these yielding bolts can still retain load carrying capacity even with up to 1 m of closure, for the simulated conditions. The same dynamic simulation using fully encapsulated resin grouted rockbolts indicated that a significant fraction of resin bolts fail at ~100 mm of closure. The simulations demonstrate several important components of a framework for realistic simulations of excavations and ground support systems subjected to dynamic loading. Many parts of this framework are proposed as technology development directions, and combining all parts into workable simulations will indeed be challenging. However, for critical excavations, such sophisticated analyses may be justified.
Beck, D., Stacey, K. and Gilbert, D. (2010) Mine to tunnel scale discontinuum simulation of repeated dynamic loading of mine excavations, in Proceedings Second Australasian Ground Control in Mining Conference 2010, 23–24 November 2010, Sydney, Australia, The Australasian Institute of Mining and Metallurgy, Carlton.
Campbell A., Henley, K. and Lilley, C. (2011) Prevention of blast induced damage to underground mine infrastructure from open pit operations – A case study, in Proceedings Explo 2011, 8–9 November 2011, Melbourne, Australia, The Australasian Institute of Mining and Metallurgy, Carlton, pp. 161–174.
Columbia Accident Investigation Board Report Volume 1 (2003), NASA, Washington.
Dassault Systèmes (2013) Abaqus Analysis User’s Manual, Dassault Systèmes SA, Vélizy-Villacoublay, viewed 2 April 2013,
Grady, D.E. and Kipp, M.E. (1979) The micromechanics of impact and fracture of rock, International Journal of Rock Mechanics and Mining Sciences, Vol. 16, pp. 293–302.
Jennmar (2012) Yield-Lok bolt, Jennmar Australia, viewed 5 April 2013,
Levkovitch, V., Reusch, F. and Beck, D. (2010) Application of a non-linear confinement sensitive constitutive model to mine scale simulations subject to varying levels of confining stress, in Proceedings Rock Mechanics in Civil and Environmental Engineering (EUROCK 2010), J. Zhao, V. Labiouse, J. Dudt and J. Mathier (eds), 15–18 June 2010, Lausanne, Switzerland, CRC Press, pp. 161–164.
Plouffe, M., Anderson, T. and Judge, K. (2008) Rock bolts testing under dynamic conditions at CANMET-MMSL, in Proceedings Sixth International Symposium on Ground Support in Mining and Civil Engineering Construction, 30 March–2 April 2008, Cape Town, South Africa, pp. 581–596.
Potvin Y., Wesseloo, J. and Heal, D. (2010) An interpretation of ground support capacity submitted to dynamic loading, in Proceedings Fifth International Seminar on Deep and High Stress Mining (Deep Mining 2010), M. Van Sint Jan and Y. Potvin (eds), 6–8 October 2010, Santiago, Chile, Australian Centre for Geomechanics, Perth, pp. 251–272.
Wu, Y.K. and Oldsen, J. (2010) Development of a new yielding rock bolt - Yield-Lok bolt, in Proceedings of 44th US Rock Mechanics Symposium and 5th US-Canada Rock Mechanics Symposium, 27–30 June 2010, Salt Lake City, USA, American Rock Mechanics Association, paper 10–197.