Authors: Rigby, A; Malovichko, D; Kaiser, PK

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DOI https://doi.org/10.36487/ACG_repo/2465_92

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Rigby, A, Malovichko, D & Kaiser, PK 2024, 'Simulating the displacement and energy demand imposed by a strainburst near a tunnel', in P Andrieux & D Cumming-Potvin (eds), Deep Mining 2024: Proceedings of the 10th International Conference on Deep and High Stress Mining, pp. 1399-1414, https://doi.org/10.36487/ACG_repo/2465_92

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Abstract:
During a strainburst, there is a simultaneous energy and displacement demand placed on the support system. To better understand the evolution of this demand, high-resolution, dynamic, two-dimensional modelling was conducted of self-initiated strainbursting near an isolated circular tunnel. By analysing the results of this modelling, estimates are made of the radial damage propagation velocity (193 m/s) and the duration to form a strainburst notch (4.1 ms) that are consistent with previously reported values. It is shown that surface displacements evolve to equilibrium more slowly than damage propagation, with a duration of 14.1 ms estimated. This is consistent with source durations estimated from seismic data for small strainbursts. It is shown that for the case considered (stiff loading system, no detaching of rock), an energy pulse is generated that leads to a demand path that deviates from the hyperbolic path used in deformation-based support design (for violent strainbursting in a soft mining environment). A parametric study was conducted to quantify the effect of varying the support pressure, depth of burden, and rock mass parameters (stiffness and brittleness). These factors are shown to strongly influence the demand path generated by a strainburst.

Keywords: strainbursting, ground support, support demand, numerical modelling, seismology

References:
Basson, G, Bassom, AP & Salmon, B 2021, ‘Simulating mining-induced seismicity using the material point method’, Rock Mechanics and Rock Engineering, vol. 54, no. 9, pp. 4483–4503,
Cai, M 2024, ‘Rockburst risk control and mitigation in deep mining’, Deep Resources Engineering, pp. 100019,
Diedrichs, MS 2007, ‘The 2003 Canadian Geotechnical Colloquium: mechanistic interpretation and practical application of damage and spalling prediction criteria for deep tunnelling’, Canadian Geotechnical Journal, vol. 44, no. 9, pp. 1082–1116,
Hang, S 2015, ‘TetGen, a Delaunay-Based quality tetrahedral mesh generator’, ACM Transactions on Mathematical Software, vol. 41, no. 2, pp. 1–36,
Hoek, E, Carranza-Torres, C & Corkum, B 2002, ‘Hoek-Brown failure criterion-2002 edition’, Proceedings of NARMS-TAC, vol. 1, no. 1, pp. 267–273.
Kaiser, PK & Moss, A 2022, ‘Deformation-based support design for highly stressed ground with a focus on rockburst damage mitigation’, Journal of Rock Mechanics and Geotechnical Engineering, vol. 14, no. 1, pp. 50–66,
j.jrmge.2021.05.007
Kirsch, EG 1898, ‘Die theorie der elastizitat und die bedurfnisse der festigkeitslehre’, Zeitshrift des Vereines deutscher Ingenieure, vol. 42, pp. 797–807.
Kusui, A 2015, Scaled Down Tunnel Testing for Comparison of Surface Support Performance, PhD thesis, Curtin University, Perth.
Malovichko, D 2022, ‘Utility of seismic source mechanisms in mining’, Proceedings of the Tenth International Symposium on Rockbursts and Seismicity in Mines, Society for Mining, Metallurgy & Exploration, Englewood.
Malovichko, D 2023, ‘Utilisation of seismic data in the assessment of displacement and energy demand imposed on ground support by strainbursts’, in J Wesseloo (ed.), Ground Support 2023: Proceedings of the 10th International Conference on Ground Support in Mining, Australian Centre for Geomechanics, Perth, pp. 181–196,
Malovichko, D & Kaiser, PK 2020, ‘Dynamic model for seismic shakedown analysis’, 54th US Rock Mechanics/Geomechanics Symposium.
Malovichko, D & Rigby, A 2022, ‘Description of seismic sources in underground mines: dynamic stress fracturing around tunnels and strainbursting’, arXiv,
Nairn, JA 2003, ‘Material point method calculations with explicit cracks’, Computer Modeling in Engineering and Sciences, vol. 4, no. 6, pp. 649–664,
Perras, MA & Diedrichs, MS 2016, ‘Predicting excavation damage zone depths in brittle rocks’, Journal of Rock Mechanics and Geotechnical Engineering, vol. 8, no. 1, pp. 60–74,
Rigby, A 2023, ‘Dynamic modelling of strainbursting around tunnels’, in J. Wesseloo (ed.), Ground Support 2023: Proceedings of the 10th International Conference on Ground Support in Mining, Australian Centre for Geomechanics, Perth, pp. 151–164,
Rigby, A, Malovichko, D & Kaiser, PK 2024, F-SBM-01 Reference Case, video file, viewed 6 July 2024, youtu.be/dkfkaZiCyR4
Walton, G 2019, ‘Initial guidelines for the selection of input parameters for cohesion-weakening-friction-strengthening (CWFS) analysis of excavations in brittle rock’, Tunnelling and Underground Space Technology, vol. 84, pp. 198–200,
Wang, B, Vardon, PJ, Hicks, MA & Chen, Z 2016, ‘Development of an implicit material point method for geotechnical applications’, Computers and Geotechnics, vol. 71, pp. 159–167,
Zhao, ZG & Cai, M 2010, ‘A mobilized dilation angle model for rocks’, International Journal of Rock Mechanics and Mining Sciences, vol. 47, no. 3, pp. 168–384,
Zhao, ZG, Cai, MF & Cai, M 2010, ‘Considerations of rock dilation on modeling failure and deformation of hard rocks–a case study of the mine-by test tunnel in Canada’, Journal of Rock Mechanics and Geotechnical Engineering, vol. 2, no. 4, pp. 228–349,




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