A viscoplastic discontinuum model of time-dependent fracture and seismicity effects in brittle rock

摘要: Abstract A model is proposed for the direct mechanistic simulation of seismic activity and stress transfer effects in deep level mines. The uses a discontinuum viscoplastic formulation to relate rate slip on crack shear acting crack. procedure outlined solution collection interacting cracks series time steps computation energy changes assembly during each step. Elastodynamic are not considered. In spite simplicity law, it shown that complex material behaviour can occur if applied random cracks. particular demonstration given primary, secondary tertiary creep phases uniaxially compressed sample containing an initial population weak flaws. next face advance gold mine excavation give favourable agreement between observed length fractures mobilized mesh around opening. modelled closure roof floor, as function time, also be quantitatively similar field movements. final example mining parallel-sided at different rates which illustrates tradeoff high tow but potentially greater damage rock near stope.