Investigation of expanding Split Sets

Authors: Davison, GR; Fuller, PG

DOI https://doi.org/10.36487/ACG_rep/1304_09_Davison

Cite As:
Davison, GR & Fuller, PG 2013, 'Investigation of expanding Split Sets', in Y Potvin & B Brady (eds), Ground Support 2013: Proceedings of the Seventh International Symposium on Ground Support in Mining and Underground Construction, Australian Centre for Geomechanics, Perth, pp. 163-170, https://doi.org/10.36487/ACG_rep/1304_09_Davison

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Abstract:
Expanding rockbolts anchor to the rock mass using friction and mechanical interlocking at the rockbolt interface. An internally expanding friction rockbolt is capable of generating much higher radial force along its entire length than standard friction bolts. This results in increased friction between the rock mass and the friction bolt. Tubular form expanding friction bolts have never gained a following in Australia due to perceived installation issues, relatively low tensile strength and corrosion problems associated with the thin expansion walls. This paper shows that Jumbo installation of expanding friction rockbolts is now possible with the same ease as traditional ‘Split Set’ style friction bolts. The expanding friction bolt discussed in this paper has the same material properties as conventional friction bolts, but provides increased corrosion protection and increased anchorage capacity per embedded metre due to the expanding properties of its grout core.

References:
Davison, G.R. (2008) The development of industry-friendly rockbolts, in Proceedings First Southern Hemisphere International Rock Mechanics Symposium (SHIRMS 2008) Vol. 1 – Mining and Civil, Y. Potvin, J. Carter, A. Dyskin and R. Jeffery (eds), SHIRMS, 16–19 September 2008, Perth, Australia, Australian Centre for Geomechanics, Perth, pp. 579–587.
Fuller, P.G. and Dugan, K.J. (1992) Factors affecting ground support performance in mining, in Proceedings 5th Underground Operator’s Conference, 14–16 July 1992, Ballarat, Australia, Australasian Institute of Mining and Metallurgy, pp. 139–144.
Thompson, A.G. and Finn, D.J. (1999) The performance of grouted split tube rockbolt systems, in Proceedings Rock Support and Reinforcement Practice in Mining, E. Villaescusa, C.R. Windsor and A.G. Thompson (eds), Balkema, Rotterdam, pp. 91–102.
Villaescusa, E. and Wright, J. (1997) Permanent excavation support using cement grouted Split Set bolts, in Proceedings International Symposium on Rock Support, Lillehammer, Norwegian Society of Chartered Engineers, Norway, pp. 660–670.




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