Hagen, SA, Larsen, T, Berghorst, A & Knox, G 2019, 'Laboratory full-scale rock bolt testing: Analysis of recent results', in W Joughin (ed.), Deep Mining 2019: Proceedings of the Ninth International Conference on Deep and High Stress Mining
, The Southern African Institute of Mining and Metallurgy, Johannesburg, pp. 217-230, https://doi.org/10.36487/ACG_rep/1952_17_Hagen
Rock bolting is a method used for rock reinforcement in underground mining and tunnelling. There is a large variety of different types of rock bolts with different support functions. The behaviour of a rock bolt in a rock mass depends on the function and material of the bolt itself, combined with the mechanical properties of the rock mass, deformation capacity, strength and level of stress. Testing of rock bolts in full-scale laboratory-controlled conditions is therefore of great importance. At the rock mechanics laboratory of SINTEF and Norwegian University of Science and Technology (NTNU) in Trondheim, a rock bolt test rig has been developed for full-scale testing for pull, shear and combination pull-shear tests. This paper describes the principles behind this quasi-static full-scale testing and includes the results and analyses of recent tests performed on different types of rock bolts. It also discusses the applicability of the test rig for rock bolt selection and rock support design.
ASTM, 2008. Standard Test Methods for Laboratory Determination of Rock Anchor Capacities by Pull and Drop Tests. D7401.
Li, C.C. 2009. Field Observations of Rock Bolts in High Stress Rock Masses. Rock Mechanics and Rock Engineering (July 2009).
Li, C.C. 2010. A new energy-absorbing bolt for rock support in high stress rock masses, International Journal of Rock Mechanics and Mining Sciences, 47 (3) (2010), pp. 396-404.
CSIR, 2016. Shear testing of five Hydrabolt assemblies (Ø29 mm SAE1010, 1.8 wall thickness). Certificate No.: T24358. CSIR, Johannesburg, South Africa.
CSIR, 2016. Shear testing of five grout bar capsules. Certificate No.: T24529. CSIR, Johannesburg, South Africa.
CSIR, 2015. Test of ten bolts (20mm PAR1 Resin Bolts). Certificate No.: T23352. CSIR, Johannesburg, South Africa.
SINTEF, 2017. Full Scale Rock Bolt Testing: Testing of strength and deformation properties of rock bolt type Hydrabolt 29 mm. Report No. 2017:00004. SINTEF, Trondheim, Norway.
SINTEF,2017. Full Scale Rock Bolt Testing: Testing of strength and deformation properties of 25 mm Par1 rock bolts. Report No. SBF2017F0007. SINTEF, Trondheim, Norway.
SINTEF, 2016. Full Scale Rock Bolt Testing: Testing of strength and deformation properties of Mp1 and Par1 bolts. Report No. SBF2016F0470. SINTEF, Trondheim, Norway.
Stjern, G. 1995 Practical Performance of Rock Bolts. Doctoral thesis, University of Trondheim, Norway.
Chen, Y.2014 Experimental study and stress analysis of rock bolt anchorage performance, Journal of Rock Mechanics and Geotechnical Engineering 6 (2014) 428-437.