... flow analysis coefficient Roughness Coefficient ha dh 0 Upstream Oil & Gas rock joint hydraulic diameter test result laminar gradient permeability flow velocity flow law 255 Rock Engineering in Difficult Ground Conditions Soft Rocks and Karst Vrkljan (ed) © 2010 Taylor & Francis...

... to represent the particle size distribution as compared to the geometric mean particle size. It has been found that the joint roughness coefficient, as well as the peak and residual friction angles increase with the average particle size index while the base friction angle does not. However, it has also been...