Abstract
Water inrush disasters are mostly related to the permeability of broken rock mass, which is associated with the deformation of rock mass, the particles migration and loss in seepage process and the breakage behavior. In this paper, samples' breakage characteristics, grain size distribution and gradation were discussed, as well as their fractal behavior and energy dissipation. It shows that compaction has an obvious effect on breakage and the fractal behavior of samples, which are inapparently affected by loading speed. The rock grains' breakage categories are related to their sharps, which affect the grain size distribution after compaction. Samples of different sizes have different optimal loading speeds and main breakage stages during compaction. It proposed two kinds of intuitive methods to judge the breakage behavior qualitatively through the grain size distribution (GSD) curves. Strain energy densities in samples mostly increase with compaction and loading speed, except for few special cases. Strain energy densities in samples are linearly correlated with the breakage index and fractal dimension, regardless of the compactions and the loading speeds. This study can provide a reference for further analysis of the permeability of the broken rock mass and even to solve the water inrush problem in the coal mines or tunnels.
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