Variation characteristics of electric resistance in the quiet periods of acoustic emission of sandstone with different saturation

Abstract

The existence of a quiet period in acoustic emission monitoring brings challenges to early warning of time-dependent rock failure. In order to understand the effect of rock loading paths and water content on acoustic emission (AE) quiet periods and the corresponding electrical resistivity (ER) changes, uniaxial loading, step loading, and incremental cyclic loading-unloading tests were carried out on dry and water-bearing sandstone samples with saturation of 40%, 70% and 100%, respectively. The results show that increasing the water content of sandstone can significantly reduce not only the strength but also the activity of AE signals. With the increase of water content, the quiet periods of AE signals increase, especially in the loading-unloading conditions. Under incremental cyclic loading-unloading conditions, the Felicity effect occurs in water-bearing sandstones. The ER variation is well consistent with stress-induced rock damage and can effectively reflect time-dependent subcritical crack propagation in both dry and water-bearing rocks. ER monitor can be used to compensate for the disadvantages of AE monitor in quiet signal periods.

Keywords

resistivity / acoustic emission / time-lag failure / sub-critical crack / Felicity effect

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