ABSTRACT
The method of probability confidence interval is used to pursue the relationships respectively between permeability and each of breaking extent, compression extent, and flow velocity. The conclusion suggests that 1) the greater the breaking extent or compression extent is, the more narrow the fluctuation interval of the mean permeability becomes; 2) after a certain extent of compression, the mean interval doesn’t obviously depend on breaking extent any more; and 3) the greater extent the rock mass is broken or compressed, the smaller the influence of seepage velocity on permeability is because the difference in flow velocity makes a narrow confidence interval. When the rock mass is compressed to a certain extent, the flow velocity exercises almost identical influence on permeability at different breaking extents.
