Yokota, Y, Zhao, Z, Nie, W, Date, K, Iwano, K, Koizumi, Y & Okada, Y 2019, 'Development of a new deformation-controlled rockbolt: numerical modelling and laboratory verification', in J Hadjigeorgiou & M Hudyma (eds), Ground Support 2019: Proceedings of the Ninth International Symposium on Ground Support in Mining and Underground Construction
, Australian Centre for Geomechanics, Perth, pp. 545-556, https://doi.org/10.36487/ACG_rep/1925_39_Yokota
To prevent large tunnel deformations caused by rock bursts or squeezing ground conditions, rockbolts need to satisfy both strength capacity and the required deformability. Currently, energy-absorbing rockbolts, such as the cone bolt and the D-bolt, have been successfully used in deep mining to avoid sudden tunnel collapses. This paper proposes a new energy-absorbing rockbolt, referred to as a deformation-controlled rockbolt (DC-bolt). The performance of the proposed DC-bolt was verified by numerical simulations using discontinuous deformation analysis (DDA) and by prototype laboratory tests. As a result, it is concluded that the DC-bolt possesses both high loading capacity and deformation capacity. Additionally, the DC-bolt can limit rock surface movement when it reaches a certain displacement. Thus, it can be a useful tunnel support for tunnels that are to be excavated in squeezing ground conditions.
Keywords: energy-absorbing rockbolt, deformation-controlled rockbolt, pull-out test, DDA
Arno, T, Patrick, S & Markus, S 2006, ‘Tunnelling in squeezing rock-yielding elements and face control’, paper presented at the 8th International Conference on Tunnel Construction and Underground Structures, Slovenia, 15–17 November.
Barla, G 2001, ‘Tunnelling under squeezing rock conditions’, Eurosummer-School in Tunnel Mechanics, Innsbruck.
Fabbri, D 2004, ‘The Gotthard Base Tunnel: Project overview’, paper presented at the 6th Annual Tunnelling Conference, Sydney, 30–31 August.
Farmer, IW 1975, ‘Stress distribution along a resin grouted rock anchor’, International Journal of Mining Science and Technology, vol. 12, no. 11, pp. 347–351.
Hoek, E 2006, Practical Rock Engineering, Rocscience,
Jager, AJ 1992, ‘Two new support units for the control of rockburst damage’, in PK Kaiser & DR McCreath (eds), Proceedings of the International Symposium on Rock Support in Mining and Underground Construction, A.A. Balkema, Rotterdam, pp. 621–631.
Kaiser, PK & Cai M 2013, ‘Critical review of design principles for rock support in burst-prone ground—time to rethink!’, 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.
Li, CC 2010, ‘A new energy-absorbing bolt for rock support in high stress rock masses’, International Journal of Rock Mechanics and Mining Sciences, vol. 47, no. 3, pp. 396–404.
Li, CC 2011, ‘Performance of D-bolts under static loading’, Rock Mechanics and Rock Engineering, vol. 45, no. 2, pp. 183–192.
Li, CC 2017, ‘Principles of rockbolting design’, Journal of Rock Mechanics and Geotechnical Engineering, vol. 9, no. 3, pp. 396–414.
Li, CC, Stjern, G & Arne, M 2014, ‘A review on the performance of conventional and energy-absorbing rockbolts’, Journal of Rock Mechanics and Geotechnical Engineering, vol. 6, no. 4, pp. 315–327.
Ortlepp, WD 1992, ‘The design of support for the containment of rockburst damage in tunnels e an engineering approach’, in PK Kaiser & DR McCreath (eds), Proceedings of the International Symposium on Rock Support in Mining and Underground Construction, A.A. Balkema, Rotterdam, pp. 593–609.
Rehbock-Sander, M & Jesel, T 2018, ‘Fault induced rock bursts and micro-tremors—experiences from the Gothard Base Tunnel’, Tunnelling and Underground Space Technology, vol. 81, pp. 358–366.
Schubert, W & Moritz, B 1998, ‘Controllable ductile support system for tunnels in squeezing Rock’, Felsbau, vol. 16, no. 4,
Varden, R, Lachenicht, R, Player, J, Thompson, A & Villaescusa, E 2008, ‘Development and implementation of the Garford Dynamic ‘Bolt at the Kanowna Belle Mine’, Proceedings: Tenth AusIMM Underground Operators’ Conference—Boom and Beyond, Australasian Institute of Mining and Metallurgy, Carlton, pp. 95–102.