9 research outputs found
Influence of water-soaking time on the acoustic emission characteristics and spatial fractal dimensions of coal under uniaxial compression
Influence of water-soaking time on the acoustic emission characteristics and spatial fractal dimensions of coal under uniaxial compression
The water-soaking time affects the physical and mechanical properties of
coals, and the temporal and spatial evolution of acoustic emissions reflects
the fracture damage process of rock. This study conducted uniaxial
compression acoustic emissions tests of coal samples with different
water-soaking times to investigate the influence of water-soaking time on
the acoustic emissions characteristics and spatial fractal dimensions during
the deformation and failure process of coals. The results demonstrate that
the acoustic emissions characteristics decrease with increases in the
water-soaking time. The acoustic emissions spatial fractal dimension changes
from a single dimensionality reduction model to a fluctuation dimensionality
reduction model, and the stress level of the initial descending point of the
fractal dimension increases. With increases in the water-soaking time, the
destruction of coal transitions from continuous intense failure throughout
the process to a lower release of energy concentrated near the peak
strength