Brandle, R & Luis Fonseca, R 2019, 'Dynamic testing of surface support systems', in J Hadjigeorgiou & M Hudyma (eds), Proceedings of the Ninth International Symposium on Ground Support in Mining and Underground Construction
, Australian Centre for Geomechanics, Perth, pp. 243-250.
Ground support for dynamic conditions must be able to withstand the associated loads and deformations and the support scheme has to work as a system. In order to prove the suitability of such support systems with high-tensile steel mesh and bolts and to analyse the bearing behaviour of them, a large-scale test setup was commissioned in Walenstadt, Switzerland. On this test rig it is possible to apply large energies on variable ground support systems with variable bolt patterns and meshes with a total support area of 3.6 × 3.6 m in a full-scale manner. The test site is instrumented by load cells, high-speed video analysis and accelerometers. In this paper the analysis of the load cells, the accelerometers and the high-speed video cameras is given and results of system tests are discussed. It could be shown that a combination of hightensile steel mesh with a specific bolt pattern can result in high energy capacity surface support. Distribution of the impact loads during the stopping process to the different elements of the bearing support system depends on the strength and flexibility of the mesh and the bolts resistance and his pattern.
Keywords: dynamic test, full-scale setup, system test
Luis Fonseca, R, Laguna, L & Muñoz, B 2009, ‘Comparative analysis of the mechanical properties of the steel membranes for slope stabilization’, VII National Symposium on Unstable Hills and Slopes, Barcelona.
Aschwanden, F & Murri, R 2018, Test Documentation of the Rockburst Impact Test, Performed on June 4, 2018, Report No. pSi180807, Dynamic Test Center AG, Vauffelin/Biel.