Damage to a rock mass is associated with the growth of microcracks and brittle fracturing, so the analysis of acoustic emission (AE) signals is well suited to study this phenomenon. A fundamental difference between acoustic emission and other techniques involving wave propagation is that a wave is generated and transmitted in the rock itself in the case of acoustic emission--as opposed to being introduced into the rock by an external source. The most important parameters recorded and used for the analysis in the AE study are peak amplitude, threshold set by the user to filter out unwanted noise, number of times a signal crosses a preset threshold datum, event duration and counts that attains peak amplitude value. The transition from stable to unstable cracking is marked by a rapid rise in stronger events and a declining trend in weaker events during the course of rock deformation. The measurable characteristics of the acoustic event waveform are capable of revealing a number of insights into the progressive failure process of rock. This paper details an AE study at Khetri Copper underground mine of Hindustan Copper Limited to assess the crown pillar stability at the 300 m level with the study
International Journal of Rock Mechanics and Mining Sciences – Elsevier
Published: Apr 1, 2004
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