Karampinos, E, Baek, B & Hadjigeorgiou, J 2018, 'Discrete element modelling of a laboratory static test on welded wire mesh', in Y Potvin & J Jakubec (eds), Proceedings of the Fourth International Symposium on Block and Sublevel Caving
, Australian Centre for Geomechanics, Perth, pp. 735-746.
Although the use of steel mesh is an integral part of the ground support arsenal for underground mines, there are limited design guidelines available. In effect, the role of mesh is not explicitly accounted for in design. The selection of a particular type of mesh is often based on empirical knowledge and field observations. In this context, the use of laboratory testing rigs have been useful, in that they provide the means for a comparative analysis of performance between different types of mesh, for example weld mesh and chain-link under static and dynamic loading. It is noted, however, that for practical reasons the majority of the testing rigs only investigate a single loading mechanism and under specific boundary conditions. The challenge has been how to investigate different loading conditions and to eventually use this knowledge in the design of mesh for underground excavations. The use of numerical modelling can eventually provide a more robust design tool.
This paper presents a numerical investigation of the mechanical behaviour of the welded wire mesh using the discrete element method (DEM). As a first step, the focus was on the use of the DEM to reproduce results from laboratory testing rigs of mesh subjected to static load through a loading plate. This paper describes ongoing work to capture the performance of welded mesh. Structural elements in the 3D DEM were calibrated to successfully capture the mechanical behaviour of the welded wire mesh as reported in the tests. The 3D DEM model explicitly simulates the interaction between the loading plate, the testing frame and the surface support elements. The model successfully reproduced the observed stress redistribution on the steel wires, the measured displacement and the failure mechanism of the mesh for the examined test configuration. The proposed technique can be extended to investigate the performance of the welded wire mesh under different loading conditions.
Keywords: ground support, welded wire mesh, discrete element method
Barton, N, Lien, R & Lunde, J 1974, ‘Engineering classification of rock masses for design of tunnel support’, Rock Mechanics and Rock Engineering, vol. 6, no. 4, pp. 189–236.
Bertrand, D, Nicot, F, Gotteland, P & Lambert, S 2008, ‘Discrete element method (DEM) numerical modelling of double-twisted hexagonal mesh’, Canadian Geotechnical Journal, vol. 45, no. 8, pp. 1104–1117.
Coates, DF 1981, Rock Mechanics Principles, Mines Branch Monograph 874 (revised), CANMETEnergy, Department of Energy, Mines and Resources, Ottawa.
Dolinar, D 2006, ‘Load capacity and stiffness characteristics of screen materials used for surface control in underground coal mines’, Proceedings of the 25th International Conference on Ground Control in Mining, National Institute for Occupational Safety and Health, Washington, D.C., pp. 152–158.
Gadde, M, Rusnak, J & Honse, J 2006, ‘Behaviour of welded wire mesh used for skin control in underground coal mines’, Proceedings of the 25th International Conference on Ground Control in Mining, National Institute for Occupational Safety and Health, pp. 142–151.
Grimstad, E & Barton, N 1993, ‘Updating the Q-system for NMT’, in C Kompen, SL Opsahl & SL Berg (eds), Proceedings of the International Symposium on Sprayed Concrete, Norwegian Concrete Association, Oslo.
Itasca Consulting Group Inc. 2012, FLAC3D — Fast Lagrangian Analysis of Continua, version 5.0, computer software, Itasca Consulting Group Inc., Minneapolis.
Itasca Consulting Group Inc. 2016a, 3DEC — Three-Dimensional Distinct Element Code, version 5.2, Itasca Consulting Group Inc., Minneapolis,
Itasca Consulting Group Inc. 2016b, 3DEC — Theory and Background, Itasca Consulting Group Inc., Minneapolis.
Morton, E 2009, Static Testing of Large Scale Ground Support Panels, MSc thesis, Curtin University, Perth.
Morton, E, Thompson, A, Villaescusa, E & Roth, A 2007, ‘Testing and analysis of steel wire mesh for mining applications of rock surface support’, in C Olalla, N Grossman & L Ribeiro e Sousa (eds), Proceedings of the 11th Congress of the International Society for Rock Mechanics, Taylor & Francis, London, pp. 1061–1064.
Ortlepp, W 1983, ‘Considerations in the design of support for deep hard-rock tunnels’, Proceedings of the 5th ISRM Congress, International Society for Rock Mechanics, Melbourne.
Potvin, Y & Hadjigeorgiou, J 2016, ‘Selection of ground support for mining drives based on the Q-System’, in E Nordlund, TH Jones & A Eitzenberger (eds), Proceedings of the 8th International Symposium on Ground Support in Mining and Underground Construction, Luleå University of Technology, Luleå, pp. 1–16.
Roth, A, Cala, M, Brändle, R & Rorem, E 2014, ‘Analysis and numerical modelling of dynamic ground support based on instrumented full scale tests’, in M Hudyma & Y Potvin (eds), Proceedings of the Seventh International Conference on Deep and High Stress Mining, Australian Centre for Geomechanics, Perth, pp. 151–164.
Shan, Z, Porter, I & Nemcik, J 2014, ‘Performance of full scale welded steel mesh for surface control in underground coal mines’,
in BI Morsi (ed.), Proceedings of the 31st Annual International Pittsburgh Coal Conference: Coal – Energy, Environment and Sustainable Development, vol. 1, International Pittsburgh Coal Conference, University of Pittsburgh, Pittsburgh, pp. 1–10.
Tannant, D 1995, ‘Load capacity and stiffness of welded-wire mesh’, Proceedings of the 48th Canadian Geotechnical Conference, Vancouver, pp. 729–736.
Thoeni, K, Giacomini, A, Lambert, C, Sloan, S & Carter, J 2014, ‘A 3D discrete element modelling approach for rockfall analysis with drapery systems’, International Journal of Rock Mechanics and Mining Sciences, vol. 68, pp. 107–119.
Thompson, A, Windsor, C & Cadby, G 1999, ‘Performance assessment of mesh for ground control applications’, in E Villaescusa,
C Windsor & E Thompson (eds), Rock Support and Reinforcement Practice in Mining, A.A. Balkema, Rotterdam, pp. 119–130.