Hildyard, MWYoung, RP2007-02-072007-06-072007-02-072007-06-072002-01-03Hildyard, MW, Young, RP. 2002. Modelling seismic waves around underground openings in fractured rock. Pure and Applied Geophysics. vol, 159, 03 January, pp 247-2760033-4553http://hdl.handle.net/10204/1591http://hdl.handle.net/10204/1591The potential for large excavation-induced seismic events may be recognised, even if the timing of an event may be inherently unpredictable. In this case, modelling the wave propagation from a potential event could allow the dynamic motions around an excavation to be projected and for areas of danger to be anticipated. However, the above and other potential applications require accurate models of wave interaction with the openings, as well as with the fractured rock which surrounds such excavations. This paper considers real recorded waveforms and how well these waveforms are modelled by explicit mechanical models of the source, the medium and the excavation. Models of experiments at three different scales of the problem are presented: small and large amplitude waveforms recorded around a deep-level mining tunnel in a synthetic rockburst experiment; waveforms from laboratory experiments of waves through plates of steel representing fractures; waveforms from active pulses in an acoustic emission experiment in a small volume of fractured rock at the surface of an underground excavation. The results show that elastic wave propagation around an excavation was a first approximation for small amplitude waves, but was less successful for modelling large amplitude waves and more fractured rock. Fractures in the models were represented explicitly with displacement discontinuities. Waveforms through known fracture geometries were particularly well-reproduced, and indicate the importance of fracture stiffness, the in situ stress state, and stress-dependence of the fractures in such models. Overall, the models are sufficiently successful at representing recorded behaviour, to be encouraging for the goal of representing accurate wave motions around excavations.548442 bytesapplication/pdfenCopyright: 2002 Birkhauser Verlag AGWaveformsExplicit mechanical modelsSeismic wavesRock burstsFracture geometriesArticleHildyard, M., & Young, R. (2002). Modelling seismic waves around underground openings in fractured rock. http://hdl.handle.net/10204/1591Hildyard, MW, and RP Young "Modelling seismic waves around underground openings in fractured rock." (2002) http://hdl.handle.net/10204/1591Hildyard M, Young R. Modelling seismic waves around underground openings in fractured rock. 2002; http://hdl.handle.net/10204/1591.TY - Article AU - Hildyard, MW AU - Young, RP AB - The potential for large excavation-induced seismic events may be recognised, even if the timing of an event may be inherently unpredictable. In this case, modelling the wave propagation from a potential event could allow the dynamic motions around an excavation to be projected and for areas of danger to be anticipated. However, the above and other potential applications require accurate models of wave interaction with the openings, as well as with the fractured rock which surrounds such excavations. This paper considers real recorded waveforms and how well these waveforms are modelled by explicit mechanical models of the source, the medium and the excavation. Models of experiments at three different scales of the problem are presented: small and large amplitude waveforms recorded around a deep-level mining tunnel in a synthetic rockburst experiment; waveforms from laboratory experiments of waves through plates of steel representing fractures; waveforms from active pulses in an acoustic emission experiment in a small volume of fractured rock at the surface of an underground excavation. The results show that elastic wave propagation around an excavation was a first approximation for small amplitude waves, but was less successful for modelling large amplitude waves and more fractured rock. Fractures in the models were represented explicitly with displacement discontinuities. Waveforms through known fracture geometries were particularly well-reproduced, and indicate the importance of fracture stiffness, the in situ stress state, and stress-dependence of the fractures in such models. Overall, the models are sufficiently successful at representing recorded behaviour, to be encouraging for the goal of representing accurate wave motions around excavations. DA - 2002-01-03 DB - ResearchSpace DP - CSIR KW - Waveforms KW - Explicit mechanical models KW - Seismic waves KW - Rock bursts KW - Fracture geometries LK - https://researchspace.csir.co.za PY - 2002 SM - 0033-4553 T1 - Modelling seismic waves around underground openings in fractured rock TI - Modelling seismic waves around underground openings in fractured rock UR - http://hdl.handle.net/10204/1591 ER -