Abstract: In order to study the influence of bedding angles on acoustic emission (AE) characteristics, the AE experiments on the biotite granulite specimens with the bedding angles of 0°, 45° and 90° were conducted. The biotite granulite specimens were taken from Sijiaying open pit mine in Luan County, Hebei province, China. Under the uniaxial compression condition, the spatial and temporal distribution of AE events, the change of the box dimension and the characteristics of the energy release were studied. The research results have shown that：1) The evolution laws of AE events in the specimens with the bedding angles of 0° and 90° were similar, while the evolution laws of AE events in the specimens with the bedding angle of 45° were significantly influenced by the fracture modes; 2) With the increasing of the bedding angles, the number of specimens in which box dimension reduction occurred before the failure was decreasing, and AE energy was prone to releasing in a sudden way. The findings have academic value to the research on revelation of mechanism of disintegration with acoustic emission.

Key words: biotite granulite, bedding angle, acoustic emission, box dimension, energy