Abstract
The strength of a rockbolt is one of the key parameters for the design of ground support systems. However, published mechanical performance data by suppliers are usually limited to tensile strength and elongation. To provide additional performance measures, mechanical tests on four commercially available solid reinforcing bar rockbolts have been performed and analysed. In each of the cases, the rockbolts are marketed by the manufacturers as being similar and equivalent products. The mechanical tests have been developed to mimic five modes of failure that include tension, shear, torsion, and nut/thread interface. The results show significant variability in seemingly similarly marketed products. Recommendations are made for suppliers to provide additional testing results (torsion, shear and nut/thread capacity) as standard data within their product specification sheets. A summary of recommended design parameters is provided based on the test results.
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References
Amarnath H, Sitharam T (2016) 3-dimensional numerical simulations of rock bolt pullout tests of Himalayan region. Disaster Adv 9(5):1–12
Standards Australia (2007) AS 1391:2007 Metallic materials—tensile testing at ambient temperature.
Aziz N, Hawker R and Mirzaghorbanali A (2015) Strength Characteristics of Secura Hollow Groutable Cable Bolts. In: Coal Operators Conference. University of Wollongong, pp. 160–167
Haile A (1999) A mechanistic evaluation and design of tunnel support systems for deep level South African mines. University of Natal, Durban. Available at: https://researchspace.ukzn.ac.za/handle/10413/9077 Accessed 15 Jul 2019
He L, An X, Zhao XB, Zhao ZY, Zhao J (2018) Development of a unified rock bolt model in discontinuous deformation analysis. Rock Mech Rock Eng 51(3):827–847. https://doi.org/10.1007/s00603-017-1341-9
Kang H, Wu Y, Gao F, Lin J, Jiang P (2013) Fracture characteristics in rock bolts in underground coal mine roadways. Int J Rock Mech Min Sci 62:105–112. https://doi.org/10.1016/j.ijrmms.2013.04.006
Kang H, Yang J, Meng X (2015) Tests and analysis of mechanical behaviours of rock bolt components for China’s coal mine roadways. J Rock Mech Geotech Eng 7(1):14–26. https://doi.org/10.1016/j.jrmge.2014.12.002
Kang H, Wu Y, Gao F, Jiang P, Cheng P, Meng X, Li Z (2016) Mechanical performances and stress states of rock bolts under varying loading conditions. Tunnd Undergr Space Technol Pergamon 52:138–146. https://doi.org/10.1016/J.TUST.2015.12.005
Kristjánsson G (2014) Rock bolting and pull out test on rebar bolts. NTNU. https://pdfs.semanticscholar.org/b5c8/308b9927e5f0ad480ab2603542b73cda54a2.pdf. Accessed 1 Mar 2020
Li C (2010) Field Observations of Rock Bolts in High Stress Rock Masses. Rock Mech Rock Eng 43(4):491–496. https://doi.org/10.1007/s00603-009-0067-8
Li C (2012) Performance of D-bolts under static loading. Rock Mech Rock Eng 45(2):183–192
Li C (2017) Principles of rockbolting design. J Rock Mech Geotech Eng. 9(3):396–414. https://doi.org/10.1016/j.jrmge.2017.04.002
Li L, Hagan P, Saydam S, Hebblewhite B, Li Y (2016) Parametric study of rockbolt shear behaviour by double shear test. Rock Mech Rock Eng 49:4787–4797. https://doi.org/10.1007/s00603-016-1063-4
Ma S, Nemcik J, Aziz N (2014) Simulation of fully grouted rockbolts in underground roadways using FLAC2D. Can Geotech J 51(8):911–920. https://doi.org/10.1139/cgj-2013-0338
Meikle T, Tadolini S, Sainsbury B, Bolton J (2017) Laboratory and field testing of bolting systems subjected to highly corrosive environments. Int J Min Sci Technol. https://doi.org/10.1016/j.ijmst.2016.11.017
Saadat M, Taheri A (2019) Effect of contributing parameters on the behaviour of a bolted rock joint subjected to combined pull-and-shear loading: a DEM approach. Rock Mech Rock Eng. https://doi.org/10.1007/s00603-019-01921-6
Thompson A, Villaescusa E (2014) Case studies of rock reinforcement components and systems testing. Rock Mech Rock Eng 47(5):1589–1602. https://doi.org/10.1007/s00603-014-0583-z
Wu X, Yujing J, Gong B, Guan Z, Deng T (2019) Shear performance of rock joint reinforced by fully encapsulated rock bolt under cyclic loading condition. Rock Mech Rock Eng. https://doi.org/10.1007/s00603-018-1698-4
Acknowledgements
The authors would like to thank Rod Wilkie for the valuable advice and Melbourne Testing Services for the assistance with the completion of the mechanical tests.
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Sainsbury, BA., Kurucuk, N. & Bolton, J. The Mechanical Performance of Solid Reinforcing Bar Rockbolts. Rock Mech Rock Eng 53, 4599–4608 (2020). https://doi.org/10.1007/s00603-020-02187-z
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DOI: https://doi.org/10.1007/s00603-020-02187-z